Subdivision and Development Bylaw No. 3170, 2011 (Consolidated)
Nelson, British Columbia
· adopted 2012-01-09
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
SUMMARY
The City of Nelson Subdivision and Development Servicing Bylaw is to regulate and
require the provision of works and services in respect to the subdivision
and development of land within the City of Nelson.
This Bylaw is a "consolidated" version and includes amendments up to the date listed in
the bylaw heading. It is placed on the Internet for convenience only, is not the official or
legal version, and should not be used in place of certified copies which can be obtained
through the Administration office at City Hall. Plans pictures, other graphics or text in the
legal version may be missing or altered in this electronic version.
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
REVISED: January 7, 2025
BEING A BYLAW TO A BYLAW TO REGULATE AND REQUIRE THE
PROVISION OF WORKS AND SERVICES IN RESPECT TO THE SUBDIVISION
AND DEVELOPMENT OF LAND WITHIN THE CITY OF NELSON
Contents
PART 1 - INTERPRETATION ....................................................................................... 3
PART 2 - PURPOSE OF THE BYLAW .......................................................................... 9
PART 3 - MINIMUM HIGHWAY FRONTAGE ................................................................ 9
PART 4 - CONNECTION TO COMMUNITY SYSTEMS ................................................ 9
PART 5 - SERVICING REQUIREMENTS FOR SUBDIVISIONS AND
DEVELOPMENTS ....................................................................................................... 10
PART 6 - FEES AND SECURITY ................................................................................ 11
PART 7 - GENERAL PROVISIONS ............................................................................. 12
PART 8 - ENFORCEMENT ........................................................................................ 14
PART 9 - APPENDICES ............................................................................................. 15
PART 10 - REPEAL .................................................................................................... 16
PART 11 - SEVERABILITY ......................................................................................... 16
PART 12 - CITATION .................................................................................................. 16
PART 13 - EFFECTIVE DATE ..................................................................................... 16
APPENDIX A - WORKS AND SERVICE REQUIREMENTS ....................................... 17
SCHEDULE A-1 - ROADS ........................................................................................... 20
SCHEDULE A-2 - STORM DRAINAGE ....................................................................... 31
SCHEDULE A-3 - SANITARY SEWER ....................................................................... 71
SCHEDULE A-4 - WATER DISTRIBUTION ................................................................ 86
SCHEDULE A-5 - STREET LIGHTING ..................................................................... 102
SCHEDULE A-6 - RETAINING WALL SYSTEMS AND ALTERATIONS ................... 103
SCHEDULE A-7 - LANDSCAPING ............................................................................ 105
SCHEDULE A-8 - QUALITY CONTROL AND ASSURANCE .................................... 110
SCHEDULE A-9 - SUPPLEMENTAL SPECIFICATIONS .......................................... 114
SCHEDULE A-10 - STANDARD DRAWINGS ........................................................... 119
Consolidated for Convenience to Include Bylaw No. 3286, 3313, 3394, 3412,
3448, 3544, 3615
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
Subdivision and Development Servicing Bylaw No. 3170, 2011
WHEREAS pursuant to the Local Government Act, a local government may by bylaw,
regulate and require the provision of works and services for the subdivision or
development of land;
NOW THEREFORE the Council of the City of Nelson, in open meeting assembled,
enacts as follows:
PART 1 - INTERPRETATION
1.1
Definitions in this bylaw:
Application for Building Permit means the information, documents, agreements,
covenants and fees required for a building permit under the City of Nelson
Building Bylaw No. 3202, 2011 and amendments thereto
Application for Subdivision means the information, documents, agreements and
covenants required under the City of Nelson Land Development Procedures
Bylaw No. 3124, 2009 as may be amended
Approving Officer means the person appointed by the City as the Approving
Officer under the Land Title Act, and includes his or her lawful designate
Benefiting Lands means lands, other than lands that are the subject of the
Owner's Application for Subdivision or Application for Building Permit, that are
capable of being connected to or serviced by Excess or Extended Services and
are identified as such in a Latecomer Agreement
Building Bylaw means the City of Nelson Building Bylaw, No. 3202, 2011, as
amended
Building Inspector means the person appointed by the City as the Building
Inspector under the Building Bylaw, and includes his or her lawful designate
Building Permit means permission or authorization, in writing, by the Building
Inspector to perform work regulated by the Building Bylaw and the British
Columbia Building Code
Certificate of Acceptance means a certificate issued by the City verifying that all
conditions of this bylaw have been met by the Owner
Certificate of Substantial Completion means a certificate issued by the
Consulting Engineer certifying that Substantial Completion of all of the Works and
Services has been achieved
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Certificate of Total Completion means a certificate issued by the Consulting
Engineer, certifying that Total Completion of all of the Works and Services has
been achieved
Certificate to Proceed with Construction means a notice issued by the
Approving Officer authorizing the Owner to proceed with construction of the Works
and Services
Certified Irrigation Designer means an individual certified by the Irrigation
Industry of British Columbia
Chief Administrative Officer means the Chief Administrative Officer of the
Officer City, or designate
City means the Corporation of the City of Nelson
City Engineer means the Operations Engineer of the City, or designate
Community Drainage System means a system of works owned, operated and
maintained by the Ministry of Transportation or the City, designed and constructed
to control the collection, conveyance and disposal of surface or other storm water
Community Sewer System means a system of sanitary sewer works which
includes the collection and treatment of sanitary sewer which is owned, operated
and maintained by the City
Community Water System means a system of waterworks which includes the
water distribution and treatment facilities which are owned, operated and
maintained by the City
Construct or Construction means to build, erect, install, repair, alter, add,
enlarge, move, locate, re-locate, re-construct, upgrade, demolish, remove,
excavate, or shore
Consulting Engineer means a professional engineer, registered under the
Engineers and Geoscientists Act
Contract Documents means the contract documents between the Owner and its
contractor in connection with the Construction of Works and Services
Council means the Municipal Council of the Corporation of the City of Nelson
Cul-de-sac means a highway with only one point of intersection with another and
which terminates in a vehicular turning area
Day means calendar day
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Design Drawings means the drawings identifying the Works and services
requirements of this bylaw, provided by the Owner and submitted to the City
pursuant to an Application for Subdivision
Develop or Development means any construction to which the Building Bylaw
applies
Estimated Cost of Works and Services means an estimate prepared by the
Consulting Engineer that itemizes the fair market value of the construction of the
Works and Services and which includes the value of all professional fees for
design, approvals, construction period services and Record Drawings
Excavation Permit means a permit issued by the City in connection with an
application by an Owner to Construct Works and Services on, in or under a
Highway or City lands, or to encroach upon a Highway or City lands in
Constructing Works and Services on the Owner's lands where applicable
Excess or Extended Services means those Works and Services in respect of:
a) a portion of a Highway system that will provide access to Benefiting Lands;
and
b) a portion of a water, sewage or drainage system that will serve Benefiting
Lands
Fees means those fees payable to the City in connection with the Subdivision or
Development of land, as prescribed by the City of Nelson Fees and Charges
Bylaw No. 3092, 2008 as amended
Frontage means that length of a lot's boundary which immediately adjoins a
highway, other than a lane or walkway
Highway means a street, road, lane, bridge, viaduct, walkway and any other way
open to public use, but does not include an easement on private property
Lane means a public thoroughfare which affords only a secondary means of
vehicular access to a lot, at the side or rear thereof, with a road allowance of more
than 2 metres but less than 10 metres
Latecomer means an Owner of Benefiting Lands who wishes to connect to or use
Excess or Extended Services prior to the expiration of a Latecomer Agreement to
which the Benefiting Lands are subject, provided that a Latecomer who makes an
Application for Subdivision, or an Application for Development, with respect to the
Benefiting Lands, will also be considered an Owner of a Parcel or proposed Parcel
for the purpose of this bylaw
Latecomer Agreement means an agreement between the Owner and the City, in
the form prescribed by the City, as referenced in section 939 of the Local
Government Act
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Latecomer Charges means those charges determined and imposed by the City
and as defined by the Latecomer Agreement
Lot is as defined in any applicable Zoning Bylaw in affect for the City of Nelson
Maintenance Security means a deposit to the City in the form of cash; or an
unconditional irrevocable letter of credit for the Maintenance Period. Any
irrevocable letter of credit shall be; in a form satisfactory to the City, expiring no
earlier than one year from the date of issuance and providing for a right of renewal
unless the bond or letter of credit is perpetual; and shall be issued to the City by a
branch of a chartered bank, credit union or trust company provided
Maintenance Period means
a) the period of one year from the date of Total Completion;
b) with respect to Works and Services that appear to be incomplete, defective
or deficient during the Maintenance Period, the period of one year from the
date on which such Works and Services are corrected
MMCD means the Master Municipal Construction Documents as published by the
Master Municipal Construction Documents Association, as amended or replaced
from time to time
Medical Health Officer means the official appointed under the Health Act who
has jurisdiction over the area in which the subdivision is located
Nelson Landing means the lands as defined in Schedule B that are located in the
City of Nelson in the east waterfront area, on the banks of the West Arm of
Kootenay Lake. These lands were historically used for industrial purposes, and
are currently zoned for a mix of commercial and residential development (Amended
by Bylaw No. 3313, 2015)
OCP means the City of Nelson Official Community Plan Bylaw No. 3114, 2008, as
amended
Off-site Works and Services means Works and Services that are directly
attributable to the subdivision or development and that will be owned and
maintained by the City following issuance of the Certificate of Total Completion
Owner means the registered Owner of an estate in fee simple, or his agent
authorized in writing, and includes:
a)
the tenant for life under a registered life estate;
b)
the registered holder of the last registered agreement for sale; and
c)
the holder or occupier of land held in the manner as referenced the
Local Government Act
Owner/Consulting Engineering Confirmation means a confirmation letter from
the Owner and the Consulting Engineer, in the form prescribed by the City
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Panhandle Lot means any lot which gains highway frontage through the use of a
narrow strip of land which is an integral part of the said lot (hereinafter called the
"access strip")
Parcel means any lot, block, or other area in which land is held or into which land
is subdivided, but does not include a Highway
Preliminary Layout Information means such drawings, plans, information and
review documents as the Approving Officer requires, and in such form as is
required by the City, to determine, on a preliminary basis:
a) whether the proposed Subdivision would be against the public interest or
otherwise unsuitable for Subdivision; and
b) if not against the public interest or otherwise unsuitable for Subdivision,
what the Owner must include in the Application for Subdivision Approval
Preliminary Layout Review Letter means a letter from the Approving Officer to
the Owner advising of the Approving Officer's response to Preliminary Layout
Review Information provided by the Owner
Public Access Route means Public Land located between or beside lots that will
provide a connection between public roads or between public roads and open
space or parks behind the lots fronting the public road
Public Land means land owned by the Owner, Crown or City and land that, after
subdivision approval or title transfer, will be owned by the Crown or the City.
Public Land may include, but is not limited to: boulevards, medians, traffic circles,
storm water management facilities, public access routes, natural open spaces and
parks
Record Drawings means drawings prepared by and certified by the Consulting
Engineer that record the location, properties and details of Works and Services
Road means the portion of a highway constructed for vehicular traffic movement
Road Usage Permit means a permit issued by the City in connection with an
application by an Owner to construct Works and Services on, in or under a
highway or City lands, or to encroach upon a highway or City lands in constructing
Works and Services
Statutory Declaration means the Owner's sworn declaration that all amounts
relating to the Works and Services due and owing to third parties as of the date on
which the Statutory Declaration is given have been paid, including all amounts
owing to contractors and sub-contractors, and all assessments and levies under
applicable legislation
Statutory Right-of-Way means a statutory right of way under section 218 of the
Land Title Act, in a form approved by the City
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Subdivide or Subdivision means:
a)
a subdivision as defined in the Land Title Act; and
b)
a subdivision as defined in the Strata Property Act
Subdivision Application Fees means fees required to be paid pursuant to the
provisions of the City of Nelson Fees and Charges Bylaw No. 3092, 2008 as
amended
Subdivision Approval means the execution by the Approving Officer ofa plan of
Subdivision
Substantial Completion means the stage of completion of all of the Works and
Services when the Works and Services are ready to be used for their intended
purpose and have been constructed in accordance with the requirements of this
Bylaw and the engineering design drawings accepted by the City for the purpose
of the Owner's development or subdivision application and as certified by the
Consulting Engineer and verified by the City Engineer
Surveyor means a person currently licensed to practice by, and who is in good
standing with, the Association of British Columbia Land Surveyors
Total Completion means when all Works and Services, including all incomplete,
defective or deficient Works and Services that were apparent when the Certificate
of Substantial Completion was issued have been completed or corrected, as
certified by the Consulting Engineer and verified by the City Engineer
Watercourse means any natural or artificial stream, river, creek, ditch channel,
canal, conduit, culvert, drain, waterway, gully or ravine in which water flows in a
definite direction or course, either continuously or intermittently, and has a definite
channel, bed and banks and includes an area adjacent thereto subject to
inundation by reason of overflow or flood water
Works ad Services includes site grading, highways, sidewalks, boulevards,
boulevard crossings, transit bays, street lighting, wiring, water distribution
systems, fire hydrants, sewage collection and disposal systems, drainage
collection and disposal systems and such other infrastructure or systems as may
be provided within the City from time to time
Works and Services Agreement means an agreement between the Owner and
the City made pursuant to Section 219 of the Land Title Act, in substantially the
form prepared by or acceptable to the City
Zone means the zones identified and defined in the Zoning Bylaw
Zone Amending Bylaw means the bylaw passed by the City, following an
application by the Owner in connection with the Subdivision or Development of the
Owner's lands, to amend the Zoning Bylaw
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Zoning Bylaw means the City of Nelson Zoning Bylaw 3199, 2013 as amended
(Amended by Bylaw No. 3313, 2015)
Non Defined Terms
1.2
Definitions of words or phrases used in this bylaw that are not specifically defined
under Section 1.1 and are not defined under another enactment shall have the
meanings which are commonly assigned to them in the context in which they are
used in this bylaw, taking into account the specialized use of terms within the
various trades and professions to which the terminology applies.
Standards of Measure
1.3
Any equivalent imperial units of measure shown, in parenthesis, after metric units
in any schedule to this bylaw are for information purposes only and do not form
part of this bylaw.
Master Municipal Construction Document (MMCD)
1.4
All Works and Services shall be completed in accordance with the following
specifications of the Volume II of the Master Municipal Construction Document as
amended or replaced from time to time, which are incorporated into and form part
of this bylaw:
a)
Specifications, Divisions 1 - 3 and 16
b)
Standard Drawing Details
Applicability
1.5
This bylaw applies to all Owners who make an Application for Subdivision or an
Application for Building Permit, for all lands within the area incorporated as the City
of Nelson.
PART 2 - PURPOSE OF THE BYLAW
2.1
The purpose of this bylaw is to establish standards for Works and Services which
must be constructed and installed to service any Subdivision or Development of
lands within the City of Nelson.
PART 3 - MINIMUM HIGHWAY FRONTAGE
3.1
Council delegates to the Approving Officer the power to exempt a Parcel, other
than a Panhandle Lot, from the minimum Frontage requirement under the Local
Government Act.
PART 4 - CONNECTION TO COMMUNITY SYSTEMS
4.1
Prior to Subdivision Approval or issuance of a Building Permit, the Subdivision or
Development must be provided with Works and Services within the Subdivision or
on the Parcel being developed as prescribed in this Bylaw, or to the satisfaction of
the City Engineer. (Amended by BL3412, 2018)
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Connection to the Community Water System
4.2
All water distribution or fire hydrant systems provided in accordance with this bylaw
shall be connected to the Community Water System.
Connection to the Community Sewer System
4.3
All sanitary sewage collection systems provided in accordance with this bylaw shall
be connected to the Community Sewer System.
Connection to the Community Drainage System
4.4
All drainage collection systems provided in accordance with this bylaw shall be
connected to the Community Drainage System where feasible as determined by
the City Engineer.
PART 5 - SERVICING REQUIREMENTS FOR SUBDIVISIONS AND DEVELOPMENTS
5.1
Prior to Subdivision Approval or issuance of a Building Permit, the Subdivision or
Development must be provided with Works and Services within the Subdivision or
on the Parcel being developed as prescribed in this Bylaw.
5.2
Council delegates to the Approving Officer the authority to:
a)
Determine what Off-site Works and Services are directly attributable to
Subdivision or Development and are accordingly required in any
particular case;
b)
Determine what excess or extended services are required in connection
with a Subdivision or Development;
c)
Determine whether the cost of those excess or extended services are
excessive such that the municipality cannot pay for those costs;
d)
Identify the Benefiting Lands in relation to excess or extended services in
relation to a latecomer agreement; and
e)
Determine what proportion of the costs associated with the excess or
extended services is associated with each of the Benefiting Lands.
5.3
Prior to Subdivision Approval or issuance of a Building Permit, the Subdivision or
Development must be provided with off-site works and services as determined by
the Approving Officer under section 5.2 of this bylaw.
5.4
All Works and Services required as per Section 5.1 and Section 5.3 shall be
provided to the standards prescribed in the Schedules of this bylaw.
5.5
Despite Section 5.1 and Section 5.3, with the approval of the Approving Officer the
Owner may obtain Subdivision Approval or a Building Permit prior to the provision
of on-site and off-site Works and Services if the Owner provides security in
accordance with Section 6.2 and enters into a Works and Services Agreement with
the City.
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
EXEMPTIONS
5.6
Despite Section 5.1 and Section 5.3, the Works and Services requirements of this
bylaw do not apply to a Subdivision which creates only:
a)
a Highway dedication;
b)
park land; or a Parcel for the installation of public utilities and related
structures equipment.
5.7
The Approving Officer, in consultation with the City Engineer, may waive the
standards identified in Appendix A as follows: (Amended by BL3412, 2018)
a)
For the construction of required sidewalks for properties in the R1, Low
Density Residential Zone where no sidewalk infrastructure is currently
serving the area concerned. In order to waive the sidewalk requirement,
the proponent shall pay to the City's Active Transportation Reserve
account an amount equal to the value of the construction of the sidewalk
for the entire frontage of the property in question as determined by the
City Engineer; and
b)
For road construction standards in new subdivisions where significant
upgrades are required to meet current standards identified in Appendix
A. Where the Approving Officer waives the road standard, the proponent
shall provide to the City one-half of the equivalent dollar value of
construction as determined by the City Engineer of the road standard for
the entire frontage of the property in question. For clarity, one-half the
equivalent dollar value is to be determined for costs of construction of the
whole right-of-way fronting the property. Such money shall be held in a
reserve account to be used at such time the City upgrades the road in
question.
5.8
Alternative design standards that meet sustainability principles shall be considered
through development variance permit pursuant to section 922 of the Local
Government Act where the proponent provides qualified engineered solutions as
part of application.
5.9
Despite Schedule A to the said bylaw, alternate servicing standards apply to
Nelson as approved in the Zoning Bylaw. For clarity, all subdivision and
development servicing standards for Nelson Landing remain consistent to the said
bylaw, except as expressly identified in the Zoning Bylaw. (Amended by Bylaw No.
3313, 2015)
PART 6 - FEES AND SECURITY
Fees and Payment of Charges
6.1
Final approval of the Subdivision or issuance of Building Permit, as the case may
be, will not be issued by the Approving Officer or Building Inspector until all
applicable fees and charges under this bylaw and any applicable City of Nelson
fees and charges bylaw have been paid.
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Works and Services Security
6.2
Final approval of the Subdivision or issuance of a Building Permit shall not be
granted prior to the provision of Works and Services unless the Owner pays to the
City security in the form of cash or an irrevocable letter of credit in a form
acceptable to the City issued by a Canadian chartered bank, credit union or trust
company in an amount equal to one hundred and twenty five percent (125%) of the
Consulting Engineers' estimate of the cost of the Works and Services required for
the proposed Subdivision or Development to meet the requirements of this bylaw.
6.3
The Owner shall be responsible for the actual cost of the Works and Services
regardless of the adequacy of the security deposited with the City.
Maintenance Security
6.4
Following Total Completion of the Works and Services the City shall:
a)
Return the security required pursuant to Section 6.2 of this bylaw, less
ten percent (10%) to cover deficiencies during the one-year Maintenance
Period.
b)
Establish the date of commencement of the one year Maintenance
Period.
c)
Shall advise the Owner of the terms of the one year Maintenance Period.
6.5
All Works and Services required to be constructed or provided pursuant to the
provisions of this bylaw shall remain the sole responsibility of the Owner until a
Certificate of Acceptance has been issued by the City. The Owner shall maintain
the Works and Services and repair or replace any defective works during the one
year Maintenance Period. Should the Owner fail to maintain, repair or replace said
works, the City may undertake such maintenance, repairs or replacement using the
ten percent (10%) security provided for herein.
6.6
The Maintenance Period shall not commence until Total Completion of the Works
and Services has been achieved, and the Record Drawings have been submitted
by the Owner and approved by the City Engineer.
PART 7 - GENERAL PROVISIONS
Compliance
7.1
No parcel may be Subdivided or Developed, unless the Subdivision or
Development conforms to the requirements of this bylaw and other bylaws of the
City.
Project Supervision and Certification
7.2
The Owner shall submit with the application for a Certificate of Substantial
Completion a Certificate from the Consulting Engineer indicating that the
Consulting Engineer performed such periodic inspections of the Works and
Services during the construction as the Consulting Engineer considered necessary
in his or her professional judgment and that based on those inspections the
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Consulting Engineer certifies that the construction of the Works and Services meet
the requirements of the Bylaw.
Rights-of-Way and Easements
7.3
Works and Services constructed and installed under this bylaw must be located
within dedicated highways or within statutory rights of way granted by the Owner in
favour of the City or other agencies having jurisdiction.
7.4
Where Works and Services are not required to be constructed or installed under
this Bylaw, the City may require rights of way to be granted by the Owner in favour
of the City to allow for the eventual construction or installation of a system of water,
sewer, drainage works, or pathways.
7.5
Where the Owner is required to grant rights-of-way to the City, the Owner must
register the rights-of-way in the Land Title Office. The terms of the rights-of-way
documentation are subject to the approval of the Approving Officer prior to
registration.
7.6
Upon registration of the rights of way and before release of any security being held
by the City, the Owner must submit a copy of the registered rights-of-way plan and
agreement to the City.
7.7
All costs pertaining to the acquisition, surveying and registration of all rights-of-
ways shall be at the expense of the Owner.
Consulting Engineer
7.8
The Owner, at its expense, shall retain a Consulting Engineer to design, inspect,
test and certify all Works and Services.
Cost of Services
7.9
All Works and Services required by this bylaw shall be constructed at the expense
of the Owner.
Latecomer
7.10 Where the Owner is required to provide excess or extended services, the Owner is
entitled to receive latecomer charges in accordance with the Local Government Act
and the Latecomer Policy of the City, as applicable.
Insurance
7.11 The Owner must provide and maintain, at the Owner's expense, at all times until
the Certificate of Total Completion is issued, Comprehensive General Liability
Insurance coverage, covering premises and operations liability, contingency liability
with respect to contractual liability and automobile liability for owned, non-owned
and hired units in relation to the construction of the Works and Services. The limits
of liability must be not less than $5,000,000.00 for each occurrence for bodily
injury, death and damage to property. The policy or policies must be with a
company or companies, and on such terms, as are acceptable to the City.
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Transfer of Ownership
7.12 Works and Services constructed and installed under this bylaw become the
property of the City or the agency having jurisdiction free and clear of any charges
or encumbrances, on issuance of the Certificate of Total Completion.
Stop Work Order
7.13 The Approving Officer or the Building Inspector may order:
a)
a person who contravenes this bylaw to comply with the bylaw within a
time limit specified in the order;
b)
a person to stop construction on the work, or any part thereof, if such
work is proceeding in contravention of this bylaw.
Record Drawings
7.14 The Owner must submit Record Drawings after the completion of the Works and
Services and prior to issuance of a Certificate of Total Completion.
PART 8 - ENFORCEMENT
8.1
The Approving Officer, Building Inspector, or such other person as he may
designate, may enter at all reasonable times upon the lands for which an
Application for Subdivision or Application for Building Permit has been made, for
the purpose of administering or enforcing this bylaw. No person shall prevent or
obstruct any such official from the carrying out of these duties under this bylaw.
Violation
8.2
It is an offence for any person to cause, suffer, or permit the subdivision of land in
contravention of this bylaw or otherwise to contravene or fail to comply with this
bylaw.
8.3
It is an offence for any person to prevent or obstruct, or attempt to prevent or
obstruct the authorized entry of the Approving Officer or other appointed employee,
authorized under this bylaw.
Penalties
8.4
Every person who violates a provision of this bylaw commits an offense and is
liable upon summary conviction to a penalty not exceeding ten thousand dollars
($10,000) and costs of prosecution. Every day of violation constitutes a separate
offense.
Remedial Powers
8.5
Council may authorize the demolition, the removal, or the bringing up to standard
of any Works and Services in whole or in part, that are in contravention of this
bylaw.
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
PART 9 - APPENDICES
9.1
The following appendices and schedules are attached to and form part of this
bylaw:
Appendix A - Works and Services Requirements
Schedule A-1 - Roads
Schedule A-2 - Storm Drainage
Schedule A-3 - Sanitary Sewer
Schedule A-4 - Water Distribution
Schedule A-5 - Street Lighting
Schedule A-6 - Retaining Walls and Alterations
Schedule A-7 - Landscaping
Schedule A-8 - Quality Control and Assurance
Schedule A-9 - Supplemental Specifications to MMCD
Schedule A-10 - Standard Drawings
Schedule A-11 - Engineering Drawing Submissions
Appendix B - Nelson Servicing Agreement
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
PART 10 - REPEAL
10.1 The City of Nelson Subdivision and Development Bylaw, No. 2374, as amended, is
repealed.
PART 11 - SEVERABILITY
11.1 If any Part, Section, Paragraph or phrase of this bylaw is for any reason held to be
invalid by the decision of a Court of competent jurisdiction, such decision will not
affect the validity of the remaining portions of this bylaw.
PART 12 - CITATION
12.1 This bylaw may be cited for all purposes as the "Corporation of the City of Nelson
Subdivision and Development Servicing Bylaw No. 3170, 2011".
PART 13 - EFFECTIVE DATE
13.1 This Bylaw shall come into force and take effect upon its adoption.
READ A FIRST TIME the 7th day of November, 2011
READ A SECOND TIME the 7th day of November, 2011
READ A THIRD TIME the 7th day of November, 2011
FINALLY PASSED AND ADOPTED the 9th day of January, 2012
John Dooley_____________
Mayor
Frances Long____________
Corporate Officer
CERTIFIED A TRUE AND CORRECT COPY OF
THE "Bylaw to Regulate and Require the Provision of
Works and Services in Respect to the Subdivision and
Development of Land Within the City of Nelson No. 3170,
2011."
Frances Long
Manager of Legislative and Administrative Services
_____________________________________________________________________________________
Page 17 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
APPENDIX A - WORKS AND SERVICE REQUIREMENTS
KEY SHEET
(Amended by Bylaw 3286, 2014)
ABBREVIATION
REQUIREMENT
CWS
Community Water System. In subdivisions which are to be provided with a
community water system, each Parcel being developed must be supplied
by a water distribution system, including service connections and with
adequate fire flow and protection, to be designed in accordance with the
standards prescribed by the City.
WELL
Where a community water system is not available a proven potable water
supply located on each parcel is permitted.
CSS
Community Sanitary Sewer System.
SF
Approved Septic Field & Tank.
DITCH
Drainage collection and disposal system by open ditches and culverts.
STM
Closed drainage collection and disposal system (i.e. a system other than
open ditches).
OS
On site dispersion
SL
Street lighting throughout the subdivision.
SLI
Street lighting at street intersections only.
OH
Overhead electrical and communication wiring.
UG
Underground electrical and communication wiring.
N/A
Not Applicable
_____________________________________________________________________________________
Page 18 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
Appendix A - Works and Services Requirements
(Amended by Bylaw No. 3394, 2018)
UTILITIES
(refer to Key Sheet previous page)
ROADS (refer to
Schedule A-10 -
Standard Drawings)
Zone
Wate
r
Sewe
r
Drain
Electrical
*
Lightin
g
Roads
Sidewalk
s
R1
CWS
CSS
STM/DITCH/O
S
UG
SL/SLI
R2/R7/R
8
1
R2
CWS
CSS
STM/OS
UG
SL
R2/R7/R
8
1/2
R3
CWS
CSS
STM/OS
UG
SL
R2/R7/R
8
2
R4
CWS
CSS
STM/OS
UG
SL
R2/R7/R
8
2
R5
CWS
CSS
STM/DITCH/O
S
UG
SL/SLI
R2/R7/R
8
1/2
R6
CWS
CSS
STM/OS
UG
SL/SLI
R2
1/2
MU1
CWS
CSS
STM/OS
UG
SLI
R2/R3
1/2
MU2
CWS
CSS
STM/OS
UG
SLI
R2/R3
1/2
MU3
CWS
CSS
STM/OS
UG
SLI
R2/R3
1/2
MU4
CWS
CSS
STM/OS
UG
SLI
R/R3
1/2
MU5
CWS
CSS
STM/OS
UG
SLI
R2/R3
1/2
MU5ME
D
CWS
CSS
STM/OS
UG
SLI
R2/R3
1/2
C1
CWS
CSS
STM
UG
SL/SLI
R3/R4
2
C2
CWS
CSS
STM/OS
UG
SLI
R3/R4
1/2
C3
CWS
CSS
STM/OS
UG
SLI
R2
2
C4
CWS
CSS
STM
UG
SLI
R4
2
M1
CWS
CSS
STM/OS
UG
SLI
R3/R4
1
M2
CWS
CSS
STM/DITCH/O
S
UG
SLI
R3/R4
0/1
I1
CWS
CSS
STM/OS
UG
SLI
R3/R4
1/2
P1
CWS
CSS
STM/DITCH/O
S
UG
SLI
R3/R4
0/1
P2
CWS
CSS
STM/DITCH/O
S
UG
SLI
R3/R4
0/1
RZ1
WEL
L
SF
DITCH/OS
UG
N/A
R2/R3/R
4
0
CD
CWS
CSS
STM
UG
SL
R2/R3
1/2
_____________________________________________________________________________________
Page 19 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
1.
Where alternate standards are identified above, the Approving Officer shall
determine the constructed standard based on site conditions and anticipated
future needs.
2.
*Unless otherwise approved in advance by the City, all new subdivisions must be
serviced with underground electrical service. It shall be the developer's
responsibility to contact Nelson Hydro to arrange for design and construction of
the underground distribution system into and within the subdivision. Any system
upgrades outside the subdivision deemed necessary by Nelson Hydro shall be the
developer's responsibility and cost.
_____________________________________________________________________________________
Page 20 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
SCHEDULE A-1 - ROADS
1.1
General
The Approving Officer will consider the sufficiency and suitability of the proposed
road system, the arrangement, width, grade and location of all roads in relation to
existing and planned roads, to topographical features, to public convenience and
safety, and to the proposed uses of the land to be served by such roads.
The arrangement of roads in a Subdivision shall either:
(a)
provide for the continuation or appropriate projection of existing roads in
surrounding areas; or
(b)
where topographic or other conditions make continuation or projection of
existing roads impractical, provide an adequate and suitable roadway
system having regard to the uses of the land to be served.
The dimensions, locations and standard of all roads in a proposed Subdivision
shall conform substantially to the Official Community Plan.
Local residential roads shall be aligned so that their use by through traffic will be
discouraged.
Developments may require frontage roads, double frontage lots, deep lots with
rear service lanes, or such other treatment as may be necessary in the public
interest for the adequate protection of residential properties and to afford
separation of through and local traffic.
1.2
Road Classification (amended by BL 3544)
The existing roadway classifications within the City are described as follows:
-
Collector Roadway - A collector road has the primary function of
distributing traffic between arterial, other collector and local roads within an
area. A collector road may also provide direct access to properties.
-
Local Roadway - A local road has the primary function of providing direct
access to properties. Local roads normally connect to other local roads or
to collector roads.
Collector and local roadway classifications have been further divided into
urban and rural classifications within this bylaw. Other road network
components include:
- Lanes - A lane is a roadway with the primary function of providing
secondary land access, typically at the rear of abutting properties.
Lanes are not intended to carry through traffic. For properties
fronting collector or arterial roads, rear lanes can eliminate the need
for front driveways.
_____________________________________________________________________________________
Page 21 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
- Walkways and Pathways - Walkways and pathways are paths which
follow routes independent from motor vehicle roadways, sidewalks and
bike lanes.
The roadway classifications are summarized in Table 1.1.
Table 1.1: Roadway Classification
Roadway Classification
Right-of-Way Width
(metres)
WALKWAYS AND PATHWAYS
Concrete Walkway
2.4
Multi-Use Pathway
5.0
LANES
Residential, Emergency and Private Access
Roads
6.0
Commercial and Multi-Family
6.0
LOCAL ROADWAYS
Urban
18.0
Rural
Hillside
18.0
15.0
COLLECTOR ROADWAYS
Urban
20.0
Rural
20.0
1.3
Road Cross-Section Details (amended by BL 3544)
The standard roadway cross-sections shall be as shown on the Standard
Drawings and detailed in Table 1.2.
In areas with steep topography (20% or greater), the Consulting Engineer may
submit a request in writing to the Approving Officer for authorization to utilize the
Hillside road standards. The standards shown are the minimum permitted design
specifications; however, the Works and Services will be expected to exceed these
standards wherever possible.
_____________________________________________________________________________________
Page 22 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
The use of Hillside standards will require a pre-design report prior to approval
providing recommendations for the following:
a) Slope stability concerns;
b) Retaining walls as required;
c) Lot Grading Plan that mitigates drainage impacts on site and downstream;
d) Underground utility layout;
e) Road and pavement structure requirements;
f) Guard rail requirements;
g) Driveway access profiles;
h) Cut and fill slope profiles;
i) Snow storage location; and
j) Any additional requirements as determined by the Approving Officer.
'No Parking' signs shall be installed along the hillside roadway where there is no
practical room for on-street parking.
Note that the objectives of the standard road cross-sections as detailed in Table
1.2 and the Standard Drawings are the clear and intended goals on all roadways
within the City of Nelson. It is recognized, however, that ambient conditions may
require variance from these standards in existing and substantially "built-up"
areas, where provisions to accommodate the required roadway modifications may
not have been anticipated. A variance to these standards may be considered by
the Approving Officer.
_____________________________________________________________________________________
Page 23 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
TABLE 1.2: Roadway Cross-Section Details
Facility
Classification
Right-
of-Way
metres
Road
Width
metres
Lane
Width
metres
Parking
Shoulder
Curb
Type
Sidewalks
Bicycle
Facilities
WALKWAYS AND PATHWAYS
Concrete
Walkway
2.4
2.4
N/A
N/A
N/A
N/A
N/A
N/A
Multi-Use
Pathway
5.0
4.0
N/A
N/A
0.5 m
gravel
N/A
N/A
Shared
LANES
Residential,
Emergency
and Private
Access
6.0
6.0
1 x
4.0
N/A
N/A
N/A
N/A
N/A
Commercial
6.0
6.0
2 x
3.0
N/A
N/A
N/A
N/A
N/A
LOCAL ROADWAYS
Urban
18.0
9.0
2 x
4.5
Yes
N/A
Roll
over
1.8 m
one side
Shared
Rural
18.0
7.0
2 x
3.5
N/A
1.5 m
gravel
N/A
N/A
N/A
Hillside
(see section
1.3 for more
requirements)
15
6.6
2 x
3.3
N/A
1.0m
gravel
Roll
over
N/A
N/A
COLLECTOR ROADWAYS
Urban
20.0
10.8
2 x
4.3
Optio
nal
N/A
Barrier
1.8 m
both
sides
Shared
Rural
20.0
7.0
2 x
3.5
N/A
1.5
paved
N/A
N/A
N/A
_____________________________________________________________________________________
Page 24 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
1.5
gravel
Cul-de-Sac
(Urban)
18.0
9.0
2 x4.5
Yes
N/A
Roll
over
N/A
Shared
Cul-de-Sac
(Rural)
18.0
9.0
2x4.5
N/A
1.5
gravel
N/A
N/A
N/A
Where roadway cuts or fill sections extend beyond the right-of-way widths noted in
Table 1.2, the right-of way shall be widened accordingly.
All rock cuts, escarpments or retaining structures shall be equipped with protective
railings or fencing.
1.4
Road Design Criteria (amended by BL 3544)
All road classifications and designations for vertical and horizontal alignment
elements shall be designed utilizing the designated design speeds contained in
Table 1.3, and in compliance with the most current edition of the Transportation
Association of Canada - Geometric Design Guide for Canadian Roads. Road
design criteria to be referenced from this document include super-elevation,
centre-line radius, maximum grade, vertical curvature and sight distance.
Table 1.3: Road Design Criteria
Facility Classification
Design Speed
(km/h)
Concrete Walkway
N/A
Multi-Use Pathway
35
Lane
30
Hillside
30
Local Roadway
50
Collector Roadway
50
1.5
Vertical Alignment
The following shall be considered when establishing the vertical alignment of a
roadway:
-
The vertical alignment of roads must be set so the grades of the driveway to
adjacent properties will conform to the Standard Drawings as per Schedule
10. Where it is impractical to meet these criteria, the Approving Officer may
approve the use of private access roads.
_____________________________________________________________________________________
Page 25 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
The draining grade around the outside curb of a cul-de-sac shall be not less
than 0.5% and not greater than 5.0%. Longitudinal gradients of cul-de-sac
bulbs shall not exceed 5.0%.
-
When a cul-de-sac is at the bottom of a hill, the longitudinal gradient of the first
50 m of roadway uphill from the cul-de-sac bulb shall not exceed 5.0%. The
maximum longitudinal gradient for the rest of the hill shall not exceed 8.0%.
-
When a cul-de-sac is at the top of a hill, the longitudinal gradient for the
roadway downhill from the cul-de-sac shall not exceed 12.0%.
-
All changes in gradient over 1.0% on arterial and collector Roads and over
2.0% on all other road classifications shall be connected by vertical curves.
-
Standard cross slopes (normal crown) must be 2.0% on all road classifications
unless specified otherwise by the Approving Officer. Design road elevations
shall give due consideration to flood-proofing requirements of adjacent
properties. Full road cross-fall (reverse crown) may be considered in special
circumstances, as a means of more closely matching property grade adversity
on either side of the roadway.
-
The length of a transition from a normal cross-sectioned road to a section of
road where there is super-elevation or cross-fall must, in no case, be less than
70 m for a 50 km/h designed road. In selecting the length of the transition,
care and consideration must be given to draining the entire pavement.
Typically, if no horizontal spiral curve is used, 60% of the super-elevation is
introduced prior to the beginning of the curve, and the balance is developed in
the curve.
-
Gutter elevations on curb returns and cul-de-sacs shall be shown on the
drawings at the beginning, one-quarter points and end of curb returns and at
7.50 m intervals around cul-de-sacs.
1.6
Horizontal Alignment
The following shall be considered when establishing the horizontal alignment of a
roadway:
-
The horizontal centre-line alignment of the road shall be located on the
centre-line of the right-of-way, unless permitted otherwise by the Approving
Officer.
-
Typical locations of works and utilities in Roads are shown on the Standard
Drawings.
-
Centre-line chainage stations shall be fully referenced and dimensioned
from property lines.
-
A horizontal curve shall be fully described showing internal angle, radius,
tangent length and arc.
-
If reversed curves are required in a roadway alignment, the Approving
Officer may require that they be separated by means of tangents of
sufficient length.
-
Where angular deflections occur in a roadway alignment, the Approving
Officer may require that the angle be replaced by a curve of suitable radius.
_____________________________________________________________________________________
Page 26 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
1.7
Cul-De-Sacs
Cul-de-sac bulbs shall be used to terminate "no exit" roads as detailed in the
Standard Drawings. The following shall apply:
-
A maximum cul-de-sac length of 250 m is allowed, unless a secondary
emergency vehicle access is provided at least halfway to the end of the cul-
de-sac, in which case the length specification is not prescribed.
-
Cul-de-sac roads, designed to be permanent, shall be provided at the
closed end with an area designed to permit safe and adequate space for
the turning of motor vehicles. The preferred end treatment is a cul-de-sac
bulb. However hammerhead configurations may be provided at the
discretion of the Approving Officer.
1.8
Curb Returns
-
The minimum radius of curb return at intersections shall be 7.50 m. Curb
returns located on roads within industrial and commercial areas may
require a larger radius to facilitate truck traffic and bus traffic, and will be as
specified by the Approving Officer.
-
When a new road with curbs intersects an existing road without curbs, only
half the curb returns shall be constructed unless the road design for the
uncurbed road is available and will allow construction of the full curb
returns. Full curb returns shall be constructed at the intersection of two
curbed roads.
1.9
Intersections
-
Intersections are to be designed and located within a range of angles
between 70º and 110º.
-
In the design of all street intersections, including those with lanes and
walkways, the Consulting Engineer shall give consideration to providing
adequate decision sight and stopping distances for conflicting traffic
streams involving pedestrians, bicycles and/or vehicles.
1.10 Sidewalks, Walkways, Multi-Use Pathways, Bicycle Facilities and Wheelchair
Ramps
-
Concrete sidewalks shall be provided on roads in or adjacent to
subdivisions or developments in accordance with Table 1.2 and the
Standard Drawings.
-
The maximum grade for sidewalks shall not exceed the maximum road
grades.
-
Concrete walkways shall be provided for access through the Subdivision to
schools, playgrounds, shopping centres, transit, beaches and other
community facilities.
-
Fencing shall be provided for walkways located between lots.
_____________________________________________________________________________________
Page 27 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
The maximum grade for walkways shall not exceed 15%. Where walkways
would otherwise exceed 15%, concrete stairs shall be installed. Prior to the
authorization of concrete stairs, alternate walk routes shall be submitted for
City review and approval. Only where other acceptable walk routes are not
available, will the installation of stairs be considered.
-
Concrete walkways shall be designed as per the Standard Drawings.
-
Multi-use pathways shall be designed as per the Standard Drawings.
-
Wheelchair ramps shall be provided at all intersection curb returns as an
integral part of the sidewalk or to link walkways, crosswalks and multi-use
pathways. Design at the mid-point of the curb return. Reference Standard
Drawings.
-
Bicycle facilities shall be designed as specified in Table 1.2 and Table 1.3
and in accordance with the Transportation Association of Canada
Geometric Design Guide.
1.11 Curb and Gutter
-
Curb and gutters shall be provided as specified in Table 1.2 and the
Standard Drawings.
1.12 Driveways/Crossovers (amended by BL3448)
- Details for driveway letdowns are provided in the Standard Drawings. At the
discretion of the Director of Development Services, access to large parking
areas shall be by curb returns rather than a driveway letdown. The Approving
Officer may require deceleration and acceleration lanes for access off major
roads for safety reasons and to minimize disruption to traffic flows.
- Driveway access grades shall be designed to permit the appropriate vehicular
access for the zone, without "bottoming-out" or "hanging-up". From edge of
pavement to property line, the driveway grade shall match the boulevard slope
to encourage drainage towards the road. For the first 10 m on private property,
the maximum allowable driveway grade is 15% if accessing a local or collector
road. This maximum grade is limited to 10% if accessing an arterial road.
1.13 Transit Facilities
-
The requirement for transit facilities shall be established by the Approving
Officer.
-
Transit bays shall be provided where required by the Approving Officer, and
shall be in accordance with the "Pullouts" section of the Transportation
Association of Canada Geometric Design Guide.
-
Transit signs shall be in accordance with the Manual of Uniform Traffic
Control Devices for Canada, 1998.
_____________________________________________________________________________________
Page 28 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
1.14 Regulatory and Information Signs
-
Road name signs and traffic signs for new or improved roads shall be
provided by the City of Nelson at the expense of the Owner.
1.15 Appurtenances
-
All proposed traffic islands, retaining walls, guard-rails, and permanent
barricades shall be designed in keeping with good engineering practices.
-
Traffic control devices shall be designed and installed in accordance with
applicable and current City requirements.
-
For all utility poles and tie-downs which require re-locating prior to road
construction, the utility shall confirm the feasibility of their re-location prior to
design completion.
-
The top of escarpments, rock cuts and retaining walls constructed on or
adjacent to proposed roadways shall be equipped with railings or handrails.
1.16 Pavement Structure
a)
General Requirements
Pavement structures shall be designed by a qualified Consulting Engineer
in accordance with a commonly accepted design method (AASHTO,
Asphalt Institute, etc.). The pavement shall be designed to provide a 20
year design life.
The parameters used for design shall be based on site specific information
which shall include, but is not limited to the following:
(a) Existing pavement surface conditions
(b) Subsoil conditions
(c) Groundwater & drainage conditions
(d) Climate
(e) Traffic Volumes
b)
Field and Laboratory Investigations
A subsurface exploration program must be completed to a depth of at least
1.2 m below existing and proposed finished roadway surface grades. At
least one exploratory borehole and/or test pit shall be made at intervals of
no more than 150 m along the proposed horizontal alignment. In situ testing
shall be completed, representative soil samples collected, and laboratory
testing carried out as necessary to determine the engineering properties
and characteristics of the sub grade materials. The minimum laboratory
testing requirements include natural moisture content determinations and
grain-size analyses and/or Atterberg limit determinations as appropriate to
characterize the site sub-soils for design purposes.
Groundwater levels that may influence the roadway performance shall be
determined at the time of the investigation and seasonal fluctuations should
be estimated.
_____________________________________________________________________________________
Page 29 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
c)
Design Parameters
On the basis of the gathered information, a soaked California Bearing Ratio
(CBR) value shall be determined or estimated for use in design of the
pavement structure. A Resilient Modulus may be approximated from the
CBR value using the relationship:
MR (Mpa) = 10.3*CBR
The plasticity of the sub grade soils determined in the laboratory shall be
reported (swelling/shrinking potential).
The frost susceptibility of the soils within 850 mm of the finished paved
surface shall be considered in the design.
d)
Minimum Pavement Design
In the absence of traffic volume data, the roads shall be classified as
follows with the associated Equivalent Single Axle Loads (ESAL) for the
purposes of pavement structure design:
Table 1.4
Road Classification
Design Traffic (ESAL)
Collector
2.8 x 105
Industrial
5.6 x 104
Residential
2.8 x 104
In the event that the CBR value soaked CBR value is less than 3, the sub
grade should be enhanced to provide a CBR value of 3 to be used for the
pavement structure design calculations.
Irrespective of calculated requirements, the following values for pavement
structure component thicknesses are considered to be minimum
requirements for all roadways where:
−
the sub grade CBR value is greater than or equal to 6; and
−
the sub grade soils are not frost susceptible within 850 mm of the
finished paved surface or groundwater is at least 1.5 m below the
proposed sub grade surface.
_____________________________________________________________________________________
Page 30 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 1.5
Road
Classification
Sub-base
1
75 mm
(minus)
(mm)
Base 2
19 mm
(minus)
(mm)
Hot Mix
Asphalt
Surface
Course 3
(mm)
Collector
300
100
100 (2 lifts)
Industrial
300
100
100 (2 lifts)
Residential
300
100
75
Lanes
200
100
75
Multi-Use
Pathways
150
75
50
(1) MMCD Crushed Granular Sub-base
(2) MMCD Granular Base
(3) MMCD Upper Course #1
Pavement structure designs shall be submitted to the Approving
Officer in an acceptable report format.
e)
Construction Recommendations
Recommendations related to roadway construction shall be provided
by the Consulting Engineer. The recommendations should address:
a)
Recommendations as they apply to subgrade preparation and
enhancement;
b)
Recommendations related to long-term drainage;
c)
Road structure materials requirements; and
d)
Recommended construction methods and procedures.
f)
Reporting
The Consulting Engineer shall provide a report that includes all
pertinent information related to the design and construction of the
roadway.
_____________________________________________________________________________________
Page 31 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
SCHEDULE A-2 - STORM DRAINAGE
2.1
General
These standards are not intended to be a substitute for sound engineering
knowledge and experience. Drainage designs shall be prepared under the
direction of a Consulting Engineer with the appropriate experience and knowledge.
These standards are intended to cover only minimum requirements. Drainage
designs shall conform to all pertinent City bylaws, regulations, guidelines and
policies as well as federal and provincial statutes and guidelines. These include
but are not limited to the following:
-
Local Government Act
-
Fisheries Act
-
Water Act
-
Navigable Waters Protection Act
-
Wildlife Act
-
Riparian Area Regulation
-
Migratory Birds Convention Act
-
Dyking Act
-
Land Development Guidelines for the Protection of Aquatic Habitat
(Canada/BC)
-
Stormwater Planning - A Guidebook for British Columbia (BC/Canada)
-
Urban Runoff Quality Control Guidelines for British Columbia (BC)
-
National Guide to Sustainable Municipal Infrastructure (Canada)
-
Beyond the Guidebook: Context for Rainwater Management and Green
Infrastructure in B.C.(BC)
2.2
Storm Water Management
Storm water management involves the planning and design necessary to mitigate
the hydrological impacts of land development or land use changes. Adverse
hydrological impacts include such things as increased peak stormwater flows,
erosion, sedimentation, flooding, reduced surface infiltration, reduced minimum
groundwater levels and stream flows, water quality deterioration and degradation
of aquatic and wildlife habitats.
Mitigation measures include but are not limited to the following:
-
Appropriate sizing and routing of pipes and channels
-
Major flow path routing
-
Detention storage
-
Sediment removal
-
Biofiltration
-
Landscaping
_____________________________________________________________________________________
Page 32 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
Source control
-
Erosion protection
-
Groundwater infiltration
-
Subsurface disposal
-
Lot grading
2.3
Storm Water Management Plan
A Storm Water Management Plan is required for any development larger than 0.4
ha. The Storm Water Management Plan shall include the following:
-
Catchment plan for the subject Site which includes all upstream lands that
drain into or through the Site.
-
Description of the existing and proposed land uses.
-
Details indicating how the Storm water Management Plan integrates with
the City's Master Drainage Plan.
-
Contours at 1.0 m elevation intervals (existing and proposed).
-
Alignment and limits of existing watercourses and wetlands located in
existing and proposed, or within 30 meters of, the subject Site, complete
with environmental classifications and/or fish presence information, if
available.
-
Layout of existing and proposed drainage systems.
-
Proposed point of storm water discharge, and method of storm water
discharge, from the Site (e.g. Pipe connection to City sewer, open
discharge to ditch or natural watercourse).
-
Existing and proposed major surface flow paths.
-
Proposed lot grading plan.
-
Proposed source control and/or quality treatment facilities, if appropriate.
-
Locations, sizes and hydraulic grade line (HGL) elevations of proposed
conveyance and other management facilities for both minor and major
systems.
-
Proposed minimum building elevations (MBE) and its relationship to the
major flow path HGL.
-
Construction erosion and sediment control plan.
-
Pre and post-development flows, with and without the impact mitigation
measures.
-
Downstream capacity for the system which the subject Site is proposed to
discharge to.
-
Pre-development flows for all areas draining to or through the subject site.
_____________________________________________________________________________________
Page 33 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2.4
Minor and Major Systems
Each drainage system consists of the following components:
a)
The Minor System
Pipes, gutters, catch-basins, driveway culverts, open channels,
watercourses and storm water management facilities designed to carry
flows with the specified return frequency.
b)
The Major System
Surface flood paths, roadways, roadway culverts, swales, watercourses
and storm water management facilities designed to carry flows with the
specified return frequency.
2.5
Runoff Analysis
Storm drainage systems shall be designed to accommodate the post-development
flows using the Rational Method or an approved hydrologic/hydraulic computer
model. All calculations pertinent to the design of the drainage system shall be
signed and sealed by the Consulting Engineer and submitted to the City.
For developments where the total tributary area is 10 hectares or less, the
Rational Method may be used to compute the peak runoffs. An approved
hydrologic/hydraulic computer model shall be used for analyzing larger
catchments and for the design of all storage facilities.
The extent of the tributary drainage areas of the storm drainage system under
design shall be in accordance with the natural contours of the land and be subject
to the overall drainage plan established by the City through any Master Drainage
Plan (MDP), Neighbourhood Concept Plan (NCP), or other area servicing plans
established for the catchment in which the subject property is located.
It is the Consulting Engineer's responsibility to confirm the extent of the drainage
area with the Approving Officer prior to final design.
Regardless of the analytical method being used, the tributary area used for the
design of the storm drainage system shall be consistent with the actual contours of
the land.
2.6
Design Frequencies
In general, the design of storm water management system components is required
to accommodate a number of variable storm runoff rates and volumes generated
by storms of certain recurrence intervals. The following storm return frequencies
shall be used for the design of the drainage and storm water management system
components:
_____________________________________________________________________________________
Page 34 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 2.1
Drainage System
Component
Hydraulic Variables
Hydrologic Design
Basis
On-site Minor Disposal
System (where proven
to be appropriate)
Mean Annual Rainfall
(MAR) volume,
infiltration rates of
native soils,
groundwater levels
On-site disposal
features to retain 50%
of the Mean Annual
Rainfall (MAR) volume
Minor conveyance
system comprising the
storm sewers,
driveway culverts, low
flow channels and
watercourses
Peak flow rate, flow
depth, duration and
base flow rates
1:10 year design storm
with winter condition
antecedent moisture
condition
Storage facility
Runoff volume, depth,
freeboard, peak inflow
rate, control discharge
rate, time to empty,
base flow rates
Storage capacity to
reduce the post-
development flow
rates to below their
respective pre-
development levels up
to the 1:10 year event.
This may be increased
to 1:100 year if
inadequate
downstream major
flow paths exist
Major system
comprising the surface
flow paths, roadways,
storage facility
overflows and
watercourses
Peak flow rate, flow
depth, duration,
storage outflow and
overflow rates, runoff
volumes, and velocity
1:100 year design
storm with winter
condition antecedent
moisture condition.
Sufficient freeboard
above the maximum
hydraulic grade line
must be provided to
protect buildings.
_____________________________________________________________________________________
Page 35 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 2.1 (Continued)
Drainage System
Component
Hydraulic Variables
Hydrologic Design
Basis
Culverts, bridges, and
other crossing
structures
Peak flow rates, depth
and freeboard,
backwater effect, fish
passage
1:100 year design
storm and/or with safe
overflow to protect City
of Nelson
infrastructure and
private property. 1:200
year for natural
streams with
catchments exceeding
10 sq. km or for
structures crossing
arterial or collector
roads
Water Quality
Treatment Systems
Peak flow, base flow,
pollutant load and type
Treatment of flows up
to the 2 year post-
development peak rate
2.7
Site and Lot Grading
Developments shall incorporate site and lot grading techniques in accordance with
the following criteria:
a)
Each lot shall be graded to drain to a City drainage system or a natural
drainage path independent of adjacent lots. Minimum lot grades to be 2%.
Lot grading is to be uniform and consistent.
b)
Areas around buildings (or proposed building sites) shall be graded away
from the (proposed) foundations to prevent flooding.
c)
Lots lower than adjacent roadways shall be avoided where possible,
otherwise an approved storm water management technique shall be
incorporated to direct the runoff to an existing or proposed drainage
system. Proper flood proofing is required at the low points of roadways.
d)
Existing or proposed buildings shall be sited above the hydraulic grade line
of the Major System. The Minimum Building Elevations (MBE) shall be
noted on the drawings.
e)
Lot grading shall not channelize flow for discharge into natural
watercourses.
f)
Avoid drainage across adjacent lots where practical. Side and rear yard
swales shall be employed as necessary.
_____________________________________________________________________________________
Page 36 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2.8
Minimum Building Elevations (MBE)
The MBE is defined as the elevation of the lowest floor slab in a building or the
underside of the floor joists where the lowest floor is constructed over a
crawlspace. Crawlspace is defined as the space between a floor and the
underlying ground having a maximum height of 1.2 m to the underside of the joists
and not used for the storage of goods or equipment damageable by floodwater.
The MBE shall be established at least 0.6 m above the service connection invert
and 0.3 m above the 100-year hydraulic grade line elevation. Accepted MBE's
may not be revised without the permission of the Approving Officer.
2.9
Roof Drainage and Building Perimeter Foundation Drainage
Roof drainage shall be discharged to the ground and dispersed via splash pads at
the downspouts, provided that the site is graded away from the building, or to an
approved sub-surface soak-away system.
If site grading in accordance with Clause 2.7 is not possible, roof drainage may be
discharged into the municipal drainage system, at the discretion of the Approving
Officer, where the size of the proposed or existing storm sewer has been designed
for, or can be shown to accommodate the anticipated flows.
Roof leaders and foundations drains shall not discharge at the top of bank of a
natural watercourse or other open channel.
Under no circumstance shall roof leaders discharge to the sanitary sewer system.
Building perimeter foundation drains shall be discharged into the municipal
drainage system where the size of the proposed and existing downstream storm
sewer has been designed for, or can be shown to accommodate the anticipated
flows.
Under no circumstances shall a building perimeter foundation drain be connected
to a sanitary sewer.
2.10 Rational Method
The Rational Method calculates the peak flow using the formula:
Q = RAIN
Where:
R = Runoff Coefficient
A = Drainage area in ha.
I = Rainfall intensity in mm/hr.
N = 0.00278
Q = Flow in m³/s
_____________________________________________________________________________________
Page 37 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2.10.1 Runoff Coefficients
Zone designations selected for design purposes shall be based on the
highest and best use of the properties in the design catchment area based
on the most current version of the City's Zoning Bylaw. Future land
designations, as defined in the City's Official Community Plan (OCP), shall
be used if such land use designations will result in a higher runoff
coefficient.
Table 2.2
Type of Area
Coefficient
1:10 year
1:100 year
Woodlot
0.05
0.10
Agricultural (cultivated)
0.10
0.15
Sub-Urban Residential
0.35
0.40
Single Family Residential
0.50
0.55
Low Density Multi-Family
Residential
0.60
0.65
Apartment
0.70
0.75
Commercial
0.80
0.85
Industrial
0.80
0.85
Institutional
0.75
0.80
Roofs or Pavement
0.95
1.00
Parks/Cemeteries
0.15
0.20
Natural Grass
0.10
0.15
2.10.2 Time of Concentration
The time of concentration is the time required for runoff to flow from the
most remote part of the catchment area under consideration to the design
node. For both urban and rural areas, the time of concentration consists of
the following formula:
Tc = Ti + Tt
Where: Tc = time of concentration (minutes)
Ti = inlet or overland flow time (minutes)
Tt = travel time in sewers, ditches, channels or
watercourses (minutes)
_____________________________________________________________________________________
Page 38 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Inlet or Overland Flow Time (Ti)
i)
Inlet times for various development conditions are given to insure
uniformity in runoff computations.
Table 2.3
Lot Type
Inlet time
10 year
100 year
Single Family
15
10
Multi Family
10
5
Commercial/Industrial/Institutional
10
5
ii)
The inlet time in rural areas shall be calculated using the Airport
Method:
Ti =
3.26(1.1 - C) L0.5
S0.33
Where: Ti = inlet (minutes), minimum time = 15 minutes
C = runoff coefficient
L = travel distance (m), maximum length = 300 m
S = slope of travel path (%)
Travel Time (Ti)
The travel time in sewers, ditches, channels or watercourses shall
be estimated using the following formula:
Ti =
Ct Ln
12 s 0.5
Ct
=
Concentration coefficient depending on the type of
flow
=
0.5 for natural watercourses or ditches
=
1.4 for overland flow
=
0.5 for storm sewer flow
L
=
Length of watercourse, conduit or overland flow in
metres, along the drainage path from the furthest
point in the basin to the outlet.
_____________________________________________________________________________________
Page 39 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
n
=
Channel friction factor
=
0.050 Natural channels
=
0.030 Excavated ditches
=
0.016 Overland flow on smooth paving
=
0.400 Overland flow on natural areas
=
0.013 Concrete pipe
=
0.011 PVC pipe
s
=
Basin slope in meter/meter
The above equation provides an approximate travel time which
shall be corrected with the actual time of flow calculated from the
hydraulic properties of the selected pipe/channel. A composite
value for Ti shall be calculated in cases where the type of flow
along the longest path varies or the slope changes.
2.10.3 Rainfall Intensity
The rainfall intensity for the Rational Method formula shall be determined
from the following rainfall Intensity-Duration-Frequency (IDF) equation.
I =
a x (T)b
Where:
I = rainfall rate in mm/hour
T = time in hours
a, b = constants as specified in Table 2.4
Table 2.4
Return Period (Yrs)
2
5
10
25
50
100
Coefficient a
10.4
13.4
15.3
17.8
19.6
21.4
Coefficient b
-0.640
-0.662
-0.673
-0.682
-0.688 -0.693
2.10.4 Mean Annual Rainfall (MAR)
Statistically, the Mean Annual Rainfall (MAR) is defined to be the 24 hour
rainfall volume with a return period of 2.33 years. For practical purposes,
the 2 year 24 hour rainfall volume is used, and is calculated to be 32.7 mm.
_____________________________________________________________________________________
Page 40 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2.10.5 Presentation of Rational Calculations
The Consulting Engineer shall be required to tabulate the Rational Method
calculations in accordance with Table 2.5 for submission along with the
appropriate plans and other relevant information.
2.11 Computer Modeling Method
2.11.1 Selection of Modeling Program
For basins larger than 10 hectares, hydrologic programs shall be used for
runoff analyses. Hydrologic/Hydraulic programs shall also be used for the
design of all storm water detention facilities. The Approving officer shall
maintain a list of currently approved software programs, and only these
shall be used for design purposes.
2.11.2 Design Storms
Rainfall hyetographs for single-event design storms with durations 15
minutes to 24 hours and various return frequencies are listed in Table 2.6.
These hyetographs were developed using Atmospheric Environmental
Services (AES) rainfall data and rainfall distribution curves. The total rainfall
depth for each storm is also listed in Table 2.6 which follows.
_____________________________________________________________________________________
Page 41 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 2.5
Storm Sewer Design - Rational Method
Project Location:
Date:
Reference No.:
Calculated By:
Storm Return
Period:
Sheet:
_____
of
____
Tributary Area
Rainfall
Intensity
(mm/hr)
Storm
Q
(m³/s)
Storm Sewer Design
Locatio
n
From
MH
To MH
R
A
Sum A
Sum
RA
L
S
Diam.
n
Velocity
Q cap
Tc
Location
of HGL
(ha)
(ha)
(m)
(%)
(mm)
(m/s)
(m³/s)
(min)
_____________________________________________________________________________________
Page 42 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 2.6 - 1:2 year Rainfall Hyetographs
15 Minute Storm
Return
Period
Rainfall (mm) for Indicated Time Period (min)
Total
5
10
15
20
25
30
35
40
45
50
55
60
2
6.3
4.7
0.9
0.7
10
9.7
7.3
1.4
1.1
100
14.0
10.5
2.0
1.5
30 Minute Storm
Return
Period
Rainfall (mm) for Indicated Time Period (min)
Total
5
10
15
20
25
30
35
40
45
50
55
60
2
8.1
5.0
1.1
0.7
0.4
0.6
0.3
10
12.2
7.6
1.6
1.1
0.6
0.9
0.5
100
17.3
10.7
2.2
1.6
0.9
1.2
0.7
1 Hour Storm
Return
Period
Rainfall (mm) for Indicated Time Period (min)
Total
5
10
15
20
25
30
35
40
45
50
55
60
2
10.4
0.8
1.0
2.0
2.1
1.0
0.8
0.7
0.7
0.5
0.4
0.3
0.1
10
15.3
1.2
1.5
2.9
3.0
1.4
1.2
1.1
1.0
0.8
0.7
0.4
0.1
100
21.4
1.7
2.1
4.1
4.3
2.0
1.7
1.5
1.4
1.1
0.9
0.6
0.2
2 Hour Storm
Return
Period
Rainfall (mm) for Indicated Time Period (min)
Total
10
20
30
40
50
60
70
80
90
100
110
120
2
13.3
1.0
1.3
2.5
2.6
1.2
1.0
0.9
0.8
0.7
0.6
0.4
0.1
10
19.2
1.5
1.9
3.7
3.8
1.8
1.5
1.4
1.2
1.0
0.8
0.5
0.1
100
26.5
2.1
2.6
5.1
5.3
2.4
2.1
1.9
1.7
1.3
1.1
0.8
0.2
3 Hour Storm
Return
Period
Rainfall (mm) for Indicated Time Period (min)
Total
15
30
45
60
75
90
105
120
135
150
165
180
2
15.4
1.2
1.5
2.9
3.1
1.4
1.2
1.1
1.0
0.8
0.7
0.4
0.1
10
21.9
1.7
2.2
4.2
4.4
2.0
1.7
1.6
1.4
1.1
0.9
0.6
0.2
100
30.0
2.3
3.0
5.7
6.0
2.8
2.3
2.1
1.9
1.5
1.3
0.9
0.2
6 Hour Storm
Return
Period
Rainfall (mm) for Indicated Time Period (hrs)
Total
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
2
19.8
1.5
2.0
3.8
3.9
1.8
1.5
1.4
1.3
1.0
0.8
0.6
0.1
10
27.5
2.1
2.7
5.3
5.5
2.5
2.1
1.9
1.8
1.4
1.2
0.8
0.2
100
37.1
2.9
3.7
7.1
7.4
3.4
2.9
2.6
2.4
1.8
1.6
1.1
0.3
_____________________________________________________________________________________
Page 43 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 2.6 - 1:2 year Rainfall Hyetographs
The tabulated data are suitable for most hydrological studies. However, the
simulation of large watersheds or complex drainage systems may require
extended duration storms or continuous rainfall data. It is incumbent upon
the consulting Engineer to obtain the appropriate rainfall data for the
analysis.
2.11.3 Catchment Data
Data preparation for planning areas or proposed development shall be
based on the best available information as per the Official Community Plan
(OCP), Zoning Bylaw, Local area Plans (LAP), Comprehensive
Development Plan (CDP), Neighbourhood Concept Plan (NCP), subdivision
proposals and other pertinent land use information.
In most cases, the Consulting Engineer shall determine both pre-
development and post-development flows using the default methods of
selected software, except when that is the Soils Conservation Service
(SCS) curve number (CN) approach. The SCS CN method shall not be
used. If sufficient information is known about the infiltration characteristics
of the soils, either the Horton's or Green Ampt methods may be applied.
Whichever method is selected, the parameters shall be reflective of the
type of soils, ground cover and typical antecedent moisture condition (AMC)
prevalent during the winter season.
Where information is not specifically available through applicable
documents, future impervious fractions for common land uses, as shown in
Table 2.7 shall be used for analysis. These are intended as a guide only. In
areas of existing development or where more detailed information is
available, the Consulting Engineer shall verify that the values shown are
representative of the true conditions.
12 Hour Storm
Return
Period
Rainfall (mm) for Indicated Time Period (hrs)
Total
1
2
3
4
5
6
7
8
9
10
11
12
2
25.4
2.0
2.3
2.5
2.5
2.5
2.8
2.8
2.8
2.0
1.8
0.8
0.5
10
34.5
2.8
3.1
3.5
3.5
3.5
3.8
3.8
3.8
2.8
2.4
1.0
0.7
100
45.9
3.7
4.1
4.6
4.6
4.6
5.0
5.0
5.0
3.7
3.2
1.4
0.9
24 Hour Storm
Return
Period
Rainfall (mm) for Indicated Time Period (hrs)
Total
2
4
6
8
10
12
14
16
18
20
22
24
2
32.7
2.6
2.9
3.3
3.3
3.3
3.6
3.6
3.6
2.6
2.3
1.0
0.7
10
43.3
3.5
3.9
4.3
4.3
4.3
4.8
4.8
4.8
3.5
3.0
1.3
0.9
100
56.8
4.5
5.1
5.7
5.7
5.7
6.2
6.2
6.2
4.5
4.0
1.7
1.1
_____________________________________________________________________________________
Page 44 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 2.7
Common Impervious Fractions
Common Land Use
Total Impervious Fraction
Woodlot
0.00
Agricultural
0.10
Sub-Urban Residential
0.35
Single Family Residential (700
m²/lot)
0.45
Low Density Multi-Family
Residential
0.65
Apartment
0.75
Commercial
0.90
Industrial
0.90
Institutional
0.80
2.11.4 Storm Events
In order to determine the critical storm event for designing drainage works,
analysis shall be conducted using design storms with the appropriate return
period and a range of durations - preferably all durations included in Table
2.6. Developing design flows for both existing and proposed development
conditions may be required. The following guide shall be used to assess the
level of effort. However, the specific requirements shall be confirmed with
the Approving Officer.
_____________________________________________________________________________________
Page 45 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
The storm duration which generates the critical peak runoff rate is not
necessarily the event which results in the largest storage volume
requirement for peak flow attenuation. The Consulting Engineer is required
to review all design storm events and select the critical design values for
each component of the drainage system.
2.11.5 Presentation of Modeling Results
To document the design rational used to develop the hydrologic model and
to standardize the presentation of model results, the design reports shall
include an appropriate section which shall indicate the following:
-
Type and version of computer model used.
-
Summary of all parameters and specific simulation assumptions
used.
-
Design storms used, to be clearly documented and plotted.
-
A Summary of peak flows for each system component
-
Inflow and outflow hydrographs for storage facilities.
-
Predicted hydraulic grade lines throughout drainage system under
conditions governing the design.
-
Volumetric runoff coefficient and unit peak flow (peak flow divided by
area) summarized for each catchment. The report documentation
shall include:
-
A plan showing sub-catchment areas, watershed boundary
(including upstream catchments) and the drainage system.
-
A plan identifying the specific land uses modeled for each
development condition analyzed.
Table 2.8
Infrastructure
Component
Storm
Return
Period
Storm Duration Range
Minor conveyance
system
1:10 year
0.5 to 24 hours to determine
design peak flow rate.
Major conveyance
system
1:100 year
0.5 to 24 hours to determine
design peak flow rate.
On-site Retention
(Infiltration) Systems
1:2 year
24 hours (MAR) to
determine on-site retention
volume.
Detention Storage
Facilities
1:10 year
1:100 year
(if
necessary)
0.5 to 24 hours to determine
maximum storage volume
and peak overflow rate.
_____________________________________________________________________________________
Page 46 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
For detention ponds, stage-area and storage-discharge curves
and the layout (including sizing) of pond control devices.
-
The functional layout and sizing of any flow control/diversion
structure and the tabular/graphical plots of inflow and outflow
hydrographs.
-
Tables summarizing the above described performance related
parameters.
2.12 Minor System Design
2.12.1 Level of Service
The minor drainage system consists of pipes and appurtenances sized to
convey peak runoff by gravity (non-surcharged) flow conditions for storms
having the return period specified in section 2.6.
2.12.2 Pipe and Channel Capacity
Apply the Manning Formula under free flow (non-surcharged) condition.
The Manning formula is:
Q =
A R 0.667 S 0.5
n
Where: Q = flow capacity (m/s)
A = cross sectional area (m²)
R = hydraulic radius (m)
S = slope of hydraulic grade line (m/m)
n = roughness coefficient
0.011 for PVC pipe
0.013 for concrete pipe
0.024 for corrugated metal pipe (CMP or CSP)
Indicate hydraulic grade line for both the 10-year and 100-year return
period on the design drawings, along with the peak design flow rate and
pipe capacity for each reach.
2.12.3 Flow Velocities
Minimum design velocity for pipes flowing full or half full: 0.6 m/s.
Where steep grades result in velocities exceeding 6 m/s, consider
measures to prevent pipe erosion and movement.
_____________________________________________________________________________________
Page 47 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Provide riprap bank protection and, if necessary, energy dissipation
facilities where discharges are approved into a watercourse. Avoid
discharge perpendicular to stream flow.
2.12.4 Minimum Grades
Minimum grades of storm sewers are required to obtain the minimum
velocity of 0.6 m/s except for catch-basin leads and service connections,
for which minimum grades are as indicated elsewhere.
2.12.5 Minimum Pipe Diameter
-
Storm Sewers
250 mm
-
Culverts:
−
Crossing Roads
500 mm
−
Crossing Driveways
400 mm
-
Catch-basin Leads
200 mm for single catch-basin
250 mm for double catch-basin
-
Service Connections:
−
Residential
100 mm
−
Commercial/Industrial
150 mm
Downstream pipe sizes are not to be reduced unless the proposed
downstream pipe is 600 mm diameter or larger and increased grade
provides adequate capacity. Detailed hydraulic analysis is required.
The maximum reduction is two pipe sizes.
2.12.6 Alignment
Except as noted in 2.12.7 horizontal and vertical alignments are to be
straight lines between manholes.
2.12.7 Curved Sewers
Where permitted by the Approving Officer, horizontal and vertical curves
may be formed using pipe joint deflections as follows:
-
Minimum radius - 60 m
-
Constant radius throughout curve
-
Joint deflection not to exceed 75% of maximum recommended by pipe
manufacturer
-
Minimum design velocity = 0.9 m/s
-
Curve locations to be recorded at ¼ points and midpoint
-
Constant offset from property line or road centerline
Where permitted by the Approving Officer, sewers larger than 600 mm
diameter may include deflections formed by mitred bends, with minimum
1.25 m straight sections and maximum 45° mitres.
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Page 48 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2.12.8 Manholes
a)
Locations:
Manholes are required at:
-
Every change in grade, except as permitted for curved sewers.
-
Every change in direction, except as permitted for curved
sewers.
-
Every change in pipe size.
-
Downstream end of curved sewers and mitred bends.
-
Every pipe intersection except for 100 mm and 150 mm service
connections and junctions with trunk sewers 900 mm and larger.
-
150 m maximum spacing for mains smaller than 900 mm.
-
250 m spacing for pipes 900 mm and larger.
-
Every future pipe intersection.
-
Upstream end of every sewer main.
-
Every catch-basin lead connection.
-
Temporary clean-outs may be provided at terminal section of a
main provided that:
−
Future extension of the main is proposed or anticipated.
−
The length of sewer to the downstream manhole does not
exceed 45.0 m.
−
The depth of the pipe does not exceed 2.0 m at the terminal
point.
−
Clean-outs are not to be considered a permanent structure.
-
Manhole rim elevations outside of paved roadways shall be
designed to be above the surrounding ground so that infiltration
from ponding will not occur.
b)
Hydraulic Details:
-
Crown elevations of inlet sewers shall not be lower than crown
elevation of outlet sewer.
-
Minimum drop in invert elevations across manholes:
−
Straight run: 5 mm drop
−
Deflections up to 45 degrees: 25 mm drop
−
Deflections 45 to 90 degrees: 50 mm drop
-
Drop manhole and ramp structures shall generally be avoided by
steepening inlet sewers. Where necessary, provide drop
structures as follows:
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Page 49 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Invert Difference
Structure
Up to 0.45
Inside Ramp
0.45 to 0.90 m
Outside Ramp
Greater than 0.90 m
Outside Drop*
* Inside drop may be used if specifically permitted by the
Approving Officer.
-
Hydraulic losses shall be calculated for manholes with significant
change of grade or alignment. For high velocity flows or large
pipes (>600 mm), detailed analysis is required. For low velocities
and smaller pipes, use the following formula:
HL = k V2
Where: HL = head loss (m)
2g
V = outlet flow velocity (m/s)
g = gravitational acceleration
(9.81 m/s2)
k = head loss coefficient (1.0 for
channeled 90° bends and tees,
to 1.5 without channelized
benching)
2.12.9 Depth and Cover
- Depth shall be defined as the distance from the finished ground
surface to the top of the pipe.
- Sewers shall be of sufficient depth to:
−
Permit gravity sewer service to the basements of properties
adjacent to the roadway of sewer right-of-way.
−
Prevent freezing.
−
Meet the minimum depth of cover requirements of 1.5 m.
−
Clear other underground utilities.
−
Prevent damage from surface loading.
−
Allow for future extension of the minor system to service
upstream tributary lands at ultimate development, as
defined by the Approving Officer.
- Maximum cover depth: 4.5 m, except under special
circumstances and with permission of Approving Officer.
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Page 50 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2.12.10 Rights-of-Way (R.O.W.)
Right-of-way locations shall be selected to avoid environmentally
sensitive areas such as watercourses, wetlands and wildlife
migration corridors and forested areas.
Rear yard sewers are discouraged and shall only be permitted with
the approval of the Approving Officer.
Where location of a municipal utility in a statutory right-of-way is
permitted by the Approving Officer, the minimum right-of-way
widths are as follows:
- Single Service:
R.O.W. width = Twice the depth from surface to the crown of the
pipe [4.5 m minimum width].
- Two Services within the Same Trench:
R.O.W. width = Twice the depth from surface to the crown of the
deeper pipe [5.5 minimum width].
- Two or More Services Adjacent to one Another but in Separate
Trenches:
R.O.W. width = Cumulative widths for single services PLUS any
difference to provide the required separation
[6m minimum width].
-
Where the service is within a road allowance, and the distance from
the property line to the centre of the service is less than one half of
the width indicated above for a single service, the difference shall
be provided as right-of-way on the adjacent property.
In all cases, the width of rights-of-way shall be sufficient to permit
an open excavation with side slopes in accordance with the
WorkSafe BC regulations, without impacting on or endangering
adjacent structures.
Where required, trunk and interceptor sewers should have rights-of-
way wide enough for future widening and/or twinning. The width of
the right-of-way should be the required separation between pipe
centerlines plus 2 times the depth of the crown of the deeper sewer.
The Consulting Engineer shall provide cross sections indicating the
minimum safe distances to adjacent building footings based on a
safe angle of repose from the limits of the excavation.
Where a utility is located within a right-of-way, and valves, valve
chambers, manholes, or other appurtenances which require
maintenance are located within the right-of-way, provide road
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Page 51 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
access from a public road. The maintenance access must be
sufficiently wide and structurally adequate to support the
maintenance vehicles for which the access is intended. Maximum
allowable grade of the maintenance access is 12%.
2.12.11 Utility Separation
Requirements for separation of storm sewers from water-mains are
as follows, unless otherwise indicated by the local public health
authority:
a)
Horizontal Separation:
At least three (3) m horizontal separation shall be maintained
between a water-main and a storm sewer.
In special circumstances, specifically in rock or where the
soils are determined to be impermeable, lesser separation
than 3.0 m may be permitted provided that:
-
The storm main and water main are installed in separate
trenches and the water main invert is at least 0.5 above
the crown of the sanitary sewer or storm sewer and the
joints are wrapped with heat shrink plastic or packed with
compound and wrapped with petrolatum tape in
accordance with the latest version of AWWA Standards
C217, and C214 or C209; or,
-
The pipes are installed in the same trench with the water
main located at one side on a bench of undisturbed soil at
least 0.5 m above the crown of the storm sewer and the
joints of the water main are wrapped with heat shrink
plastic or packed with compound and wrapped with
petrolatum tape in accordance with the latest version of
the AWWA Standards C217, and C214 or C209.
b)
Vertical Separation
Where a sanitary sewer or storm sewer crosses a water main,
the sewer should be below the water main with a minimum
clearance of 0.5 m and the joints of the water main, over a
length extending 3 m either side of the storm main, are to be
wrapped with heat shrink plastic or packed with compound
and wrapped with petrolatum tape in accordance with the
latest version of the AWWA Standards C217, and C214 or
C209.
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Page 52 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Where it is not possible to obtain the vertical separation
indicated above, and subject to local public health authority
approval, the following details may be used:
-
The water pipe joints shall be wrapped as indicated above,
and
-
The sewer should be constructed of pressure pipe such as
high density polyethylene (HDPE) or PVC with fused joints
and pressure tested to assure it is watertight.
c)
Sewers in Common Trench
Sanitary and storm sewers may be installed in a common
trench, provided that the design has taken into account:
-
Interference with service connections,
-
Stability of the benched portion of the trench,
-
Conflict with manholes and appurtenances.
The horizontal clearance between sewer pipes shall be no
less than 1.0 m and the horizontal clearance between
manholes should be no less than 0.3 m.
2.12.12 Service Connections
Every legal lot shall be provided with a separate service connection.
Unless otherwise permitted by the Approving Officer, connections
are to serve the perimeter (foundation) drains of all buildings by
gravity. The Minimum Building Elevation (MBE) shall be a minimum
0.6 m above the 100 year hydraulic grade line by gravity. Building
elevations should be established accordingly. At the discretion of
the Approving Officer, a private pump and backflow prevention
device may be requested by the property owner, or required by the
City, where the predicted major flow hydraulic grade line in the
municipal system is higher than the foundation level. All pumping
and backflow prevention devices shall be located on private
property and remain solely the responsibility of the property owner.
A covenant shall be registered on the property for such pumped
systems.
Service connections shall be provided to each lot fronting the main.
Service connections shall not be extended at an angle that exceeds
45° from perpendicular to the main, and in no case shall a service
connection be placed so that it extends in front of any property
other than the one being serviced.
Each property is permitted only one service connection. In special
circumstances, where servicing of all buildings on existing Industrial
or Commercial properties is not feasible, two services may be
allowed if permitted by the Approving Officer.
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Page 53 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Connections to new mains shall be made using standard wye
fittings. Connections to existing mains shall use wye saddles or,
where permitted by the Approving Officer, inserta-tees may be
used. All services shall enter the main at a point just below the
springline.
The standard size for single family residential service connections
shall be 100 mm, for which the minimum grade from the main to the
property line shall be 2.0%.
The minimum depth of a service at the property line shall be 1.5 m
provided that gravity service to the Minimum Building Elevation is
available.
Where rear yard sewers are necessary, due to steep topography,
the minimum cover shall be 1.0 m provided that gravity service, to
the Minimum Building Elevation is available.
2.12.13 Catchbasin Spacing
Catchbasins are required at regular intervals along roadways, at
intersections and at low points.
Catchbasin spacing is to provide sufficient inlet capacity to collect
the entire minor flow or major flow, if required, into the pipe system.
The capacity of a single catchbasin (in sump conditions) can be
calculated using the orifice formula:
Where: Q = inlet capacity (m3/s)
k = clogging factor (0.6)
C = orifice coefficient (0.8)
A = open area (0.68 m² for Dobney B-
23 grate)
g = gravitational acceleration (9.81
m/s2)
h = depth of ponding (m)
Space catchbasins to drain maximum paved areas of:
- 500 m² on roads with grades up to 4%.
- 400 m² on roads with grades greater than 4%.
Other spacing requirements include:
- Prevent overflows to driveways, boulevards, sidewalks and
private property.
- Avoid interference with crosswalks.
- Avoid low points in curb returns at intersections.
- Catchbasin leads to discharge into manholes.
gh
kCA
Q
2
=
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Page 54 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Minimum grade of catchbasin leads: 2.0%.
Lawn basins are required on boulevards and private properties
where necessary to prevent ponding or flooding of sidewalks,
boulevards, driveways, buildings and yards.
Double catchbasins shall not be connected directly together but
rather one basin will be wyed into the lead of the other. Maximum
lead length shall be 30 meters.
Double catchbasins shall be provided at all sag points.
2.12.14 Pipe Joints
Use watertight joints except where storm sewers are part of a
subsurface disposal system.
2.12.15 Groundwater Infiltration
In low areas where groundwater concentration may cause surface
ponding, reduced soil stability, or submergence of other utilities,
provide screened and filtered manhole inlets or perforated sections
of storm sewer pipe.
2.12.16 Ditch Inlets
Ditch inlets to storm sewers shall include safety grillage for large
pipes (>600 mm), debris screens and sedimentation basins.
2.13 Major System Design
2.13.1 Surface Flow Routing
All surface flows shall have specially designed routes that are
preserved and protected by right-of-ways and are accessible for
maintenance. Design criteria include:
-
HGL is to be at least 300 mm below the MBE of adjacent
buildings.
-
Maximum flow depth on roadways: 150 mm.
-
One lane, or a 3.5 m width at the crown of each road, is to be
free from flooding.
-
Where a road is used as a major flow path, the road grades are
to be designed to accommodate and control the flow at
intersections and driveways.
-
Flooding is not permitted on private property except in flow
channels in municipal rights-of-way.
-
Overflow routes are required at all sags and low points in roads
and other surface flow routes.
-
Major flood routes are required at down-slope cul-de-sacs.
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Page 55 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2.13.2 Surface Flow Capacity
Flow capacity of road surfaces and swales shall be calculated using
the Manning formula, which is presented in Section 2.12.2. Typical
values of the Manning Roughness Coefficient "n" are:
-
0.018 for paved roadway.
-
0.030 for grassed boulevards and swales.
-
0.040 to 0.10 for irregular or treed channels.
Design detail is to include consideration of flow velocities and the
potential requirement for erosion control measures. Maximum
allowable velocities for various soil types are listed in Table 2.9.
Table 2.9
Maximum Recommended Velocities In Earth
And Grass Lined Channels
Earth - Soil Type
Permissible
Velocities
M/Sec
Fine Sand
(noncolloidal)
0.5
Sandy Loam
(noncolloidal)
0.5
Silt Loam
(noncolloidal)
0.6
Ordinary Firm Loam
0.9
Fine Gravel
1.2
Stiff Clay (very
Colloidal)
1.4
Graded Loam to
Cobbles (noncolloidal)
1.4
Graded, Silt to Cobbles
(colloidal)
1.7
Alluvial Silts
(noncolloidal)
0.9
Alluvial Sites (colloidal)
1.4
Coarse Gravel
(noncolloidal)
1.8
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Page 56 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 2.9 (Continued)
Maximum Recommended Velocities In Earth
And Grass Lined Channels
Earth - Soil Type
Permissible
Velocities
M/Sec
Cobbles and Shingles
1.7
Shales and Hard Pans
1.8
Grass Lined
<0.5%
Grass Lined
5 - 10 %
Grass Lined
>10%
Erosion Resistant Soils
1.2
Erosion Resistant Soils
0.9
Erosion Resistant Soils
0.7
Highly Erodible Soils
0.9
Highly Erodible Soils
0.7
Highly Erodible Soils
0.5
2.13.3 Piped System
Where permitted by the Approving Officer, the minor drainage
system may be enlarged or supplemented to accommodate major
flows. System details shall be indicated in the Storm Water
Management Plan. Design considerations include:
-
Provision of adequate inlets to accommodate major flows.
-
The requirement for surface overflow routes at potential surface
ponding locations.
-
Design in accordance with minor drainage system guidelines.
-
Adequate capacity of the existing downstream storm sewer.
2.13.4 Culverts
Culverts located in watercourses or culverts crossing roads shall be
designed for the 1:100 year event. Driveway culverts that form part
of the minor system shall have capacity for the runoff from the 1:10
year storm. All culverts shall be sized with the design headwater not
to exceed the top of the culvert. The Consulting Engineer shall
determine whether the culvert will operate under the inlet or outlet
control at design conditions.
The minimum depth of cover for culvert shall be 0.3 m, subject to the
correct pipe loading criteria.
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Page 57 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
The maximum length of a driveway culvert is 6.0 meters, unless
otherwise permitted by the Approving Officer.
Inlet and outlet structures are required for all culverts, in accordance
with Section 2.13.5) - Inlet and Outlet Structures.
2.13.5 Inlet and Outlet Structures
Provide inlet and outlet structures for all culverts. Pipes larger than
1,200 mm diameter and non-circular culverts require specially
designed inlet and outlet structures.
Outlets having discharge velocities in excess of 1 m/s require rip rap
protection and/or energy dissipating structures for erosion control.
Hinged trash racks shall be required at the inlets of all pipes that are
450 mm and larger. Grills may also be required at the inlets on
smaller diameter storm sewers, at the discretion of the Approving
Officer.
2.13.6 Ditches
Ditches shall only be provided if in accordance with the applicable
road classification and design standards. They may also be
considered by the Approving Officer for special interim uses.
Ditches adjacent to roads shall conform to the following criteria:
-
Maximum depth
1.0 m
-
Minimum bottom width
0.5 m
-
Maximum side slope
1.5(H):1(V)
-
Minimum grade
0.5%
-
Maximum velocity (Unlined
ditch)
See Table 2.9
Where soil conditions are suitable or where erosion protection is
provided, higher velocities may be permitted. If grades are
excessive, erosion control structures or ditch enclosures may be
required.
The minimum right-of-way width for a ditch through private property
shall be 5 m or the width of the ditch plus 3 m, whichever is greater.
The ditch shall be offset in the right-of-way to permit a 3 m wide
access for maintenance vehicles. Additional right-of-way may be
required to facilitate the ditch construction and access. The top of the
ditch shall be a minimum 0.5 m away from any property line.
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Page 58 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2.14 Runoff Controls
2.14.1 Stormwater Storage Facilities
The application of infiltration features to retain frequent rainfall
volumes on-site is encouraged. The application of such features
shall be supported by a geotechnical evaluation which supports the
long-term viability of stormwater disposal on-site (See Section 2.14.8
- Groundwater Recharge). Target design parameters are listed in
Section 2.6 - Design Frequencies.
Peak flow attenuation shall be provided where post-development
stormwater runoff rates exceed the existing or pre-development
runoff rates, and the following conditions exist:
-
The proposed development site contributes directly or indirectly
to a natural watercourse or open channel that has a risk of
increased erosion.
-
The need for a storage facility has been identified in historical
documents governing drainage for that catchment.
-
The existing stormwater infrastructure downstream of the site
does not have adequate capacity to accept additional flow and
still meet the criteria herein. In this case, the Approving Officer
will consider upgrading of the downstream deficiencies, at the
Owner's cost, as an alternative to storage.
Stormwater detention shall be provided in accordance with the
criteria herein:
a) Capacity Requirements
The storage capacity requirement is determined by evaluating
the performance under a number of storm events as listed in
Table 2.10. Sufficient live storage capacity shall be provided as
follows:
-
For the purpose of minor system performance and flood control,
the storage facility shall be sized to limit the 1:10 year post
development flow to the 1:10 year pre-development level.
-
Storm events exceeding the 1:10 year level are generally
considered an overflow condition and part of the major system.
The facility shall be designed to permit the controlled overflow
release of flows up to the peak 1:100 year level to an approved
major flow path. If a sufficient major flow path does not exist, or
if the proposed release rate will increase the risk of downstream
impacts, then storage will be required to ensure that the post-
development 1:100 year flows do not exceed the 1:100 year pre-
development levels.
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Page 59 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
The performance of the storage facility shall be evaluated under
the selection of storm events listed in Table 2.10. The facility
shall be sized and designed for the criteria which results in the
largest storage volume. Storage facilities shall be designed and
evaluated using an approved modeling program as discussed in
Section 2.11. These criteria are applicable to all service areas
0.4 hectares or greater.
b) Small Lot Criteria
For service areas smaller than 0.4 hectares, the Approving
Officer may waive the requirement for a detailed analysis of the
storage facility, provided that on-site storage is provided in
accordance with the criteria listed in Table 2.10.
Table 2.10
Small Lot Stormwater Detention Requirements
Land Use
Storage
Rate
Maximum
Allowable
Release Rate
(1:2 year / 1:10
year)
Single Family Residential
200 m³/ha.
0.0025 / 0.005
m³/s/ha
Townhouse/Apartment
250 m³/ha.
0.0025 / 0.005
m³/s/ha
Commercial/Industrial
300 m³/ha.
0.0025 / 0.005
m³/s/ha
1:100 year flows and volumes are to be determined by the
Consulting Engineer as required to suit downstream
constraints.
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Page 60 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
c) Storage Alternatives
Further to 2.14.1, storage facilities shall be considered private
systems and are to be located on private property with a
registered protective covenant. Costs and long-term operation
and maintenance are the responsibility of the property owner.
Private systems shall not service more than a single lot.
At the discretion of the Approving Officer, the City may agree
to assume responsibility for the long-term operation and
maintenance of facilities that service multiple properties. In
that case, the proposed facility and all connecting services
shall be contained within municipal right-of-ways. In addition,
the facility must be accessible by vehicle from a municipal
right-of-way.
The proposed stormwater detention alternatives shall be
reviewed on a site specific basis. The Consulting Engineer
shall consider storage methods listed in this section, and other
methods of merit which the Consulting Engineer may
determine appropriate. The number and location of the
facilities shall consider the ultimate land use and servicing
plan for the watershed. The proposed concept for all storage
facilities shall be approved by the Approving Officer prior to
detailed design. Typical control facilities include:
-
Dry detention ponds, rain gardens, and swales
-
Underground storage vessels
-
Parking lot surface detention
The Consulting Engineer shall consider the site and
downstream conditions to determine the most suitable type of
storage facility. All proposals shall address safety, long-term
performance and maintenance issues.
d)
Geotechnical Considerations
On steep slopes, where stormwater detention or recharge is
proposed, where discharge to a natural watercourse or open
channel is proposed, or as required by the Approving Officer,
a geotechnical investigation shall be completed in order to
address issues such as groundwater table, soil permeability,
composition and stability. Such investigations shall be
undertaken prior to the preparation of the final design of the
facilities.
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
e)
Control Structures
The release rate from detention facilities shall be required
using a control structure. Control structure design shall be
subject to approval by the Approving Officer.
The outlet control for storage facilities shall be designed using
standard orifice or weir equations:
Orifice
Equation:
Q = C A (2 g h)0.5
Where
Q = release rate (m²/s)
C = coefficient (0.62 for sharp or square
edge)
A = area of orifice (m²)
g = gravitational acceleration (9.81 m/s2)
h = net head on orifice (m)
Weir Equation:
Q = C L H1.5
Where
Q = release rate (m3/s)
C = weir coefficient (from published
references)
L = effective length of weir crest (m)
H = net head on weir crest (m)
Storage facility shall include provisions for discharge rates
greater than the design release rate. Rapid draw down of the
facility may be necessary for emergency purposes or to
restore the available storage to accommodate subsequent
storm events.
Provisions to accommodate higher discharges shall involve
over-sizing the fixed openings and sewers connected to
control structure. Adjustable mechanism such as slide gates
or removable orifice plates can be used to regulate the design
release rates. The extent of the over-sizing will depend on the
capacity of the downstream drainage system.
Design of inlet/outlet structures shall consider flow energy
dissipation and erosion control. Safety gates are required over
all inlet/outlet openings larger than 450 mm in diameter. Locks
for access hatches are required to prevent unauthorized
entrance to the structure.
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Page 62 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
f)
Provision for Water Level Measurement
A manhole which can be accessed by maintenance vehicles
shall be provided which is hydraulically linked to the storage
facility. The invert of the manhole shall be set equivalent to the
invert of the facility to allow quick and accurate measurement
of the storage depth at any given time. The access for
measuring depth may nor may not be the same facility as the
control structure.
g) Emergency Overflow
Whether the facility is sized to control the 1:100 year event or
not, an emergency overflow spillway with the capacity for the
peak 1:100 year flow rate shall be provided for all storage
facilities. The spillway surface shall be finished with erosion
resistant material such as concrete, asphalt, paving stone, or
an approved equivalent. The design of the spillway and/or
overflow shall consider the possibility of blockages in the
outlet structure. The overflow shall provide safe discharge to
an accepted major flow path.
h) Operation and Maintenance Requirements
A minimum 4 meter wide all-weather vehicle access shall be
constructed from a public road right-of-way to the control
structure and other works requiring maintenance. The
maximum grade on the access shall be 8%. The surface shall
be finished with an erosion resistance material such as
concrete, asphalt, paving stone, or approved equivalent. A
maintenance access of the same type shall also be provided
to a sediment sump or forebay at the inlet end of an open
pond.
For facilities servicing multiple lots, and where the City agrees
to assume responsibility for operation and maintenance of the
facility, six copies of the operation and maintenance manual
shall be provided when the facility is completed and prior to
ownership to the City of Nelson. The manual shall include:
-
Record drawings of the constructed facility.
-
Brief description of the facility operation including design
flows, design depths, and schematic diagrams of the inlet
and outlet structures, connections, controls, valves,
bypasses, overflows, etc.
-
List of manufacturer's operation, service and repair
instructions and parts lists (where applicable).
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Page 63 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
Stage-storage-discharge relationship of all controls.
-
General maintenance requirements and emergency
procedures.
i)
Public Safety and Signage
All above ground storage facilities shall be designed to
maximize public safety. Interior side slopes shall be 4:1 within
the limits of the live storage volume. Side slopes above the
live storage zone may be a maximum of 3:1. The design of
storage facilities shall include adequate provisions for
installation of standard signage to warn of anticipated water
level fluctuations, with demarcation of the expected maximum
water levels for design conditions. If the permanent storage
depth in a wet detention pond exceeds 1.0 meters, a safety
barrier shall be provided in addition to signage. This barrier
should be aesthetically pleasing and may be in the form of a
chain and post fence, continuous planting of dense shrubs,
etc.
j)
Performance Monitoring
Prior to final approval of all stormwater detention facilities, the
Owner shall prepare and submit to the Owner a written
monitoring program to be conducted by the Owner for a period
of 12 months following construction. Monitoring results are to
be submitted to the City on a monthly basis for review.
Adjustments to the control device shall be required as
necessary prior to the expiry of the 1 year maintenance
period.
2.14.2 Swales and Biofiltration Swales
The term biofiltration refers to a depressed flow conveyance /
detention area that is surfaced with a relatively deep layer of highly
permeable topsoil and vegetation (turf or ornamental landscaping)
that absorbs and filters stormwater prior to discharge off-site.
Minimum depth of biofiltration swales shall be 150 mm. Maximum
depths shall be 300 mm. Deeper swales may be considered
provided side slopes do not exceed 3:1. Turf lined swales shall be
lined with a minimum 200 mm of top soil beneath the turf.
Ornamentally landscaped swales to be lined with a minimum of 450
mm of top soil, with consideration for ornamental rock placed in the
invert to resist soil erosion.
Perforated underdrains may be added for enhanced groundwater
recharge in areas where underlying native soils provide reasonable
infiltration capacity. See Section 2.15.2 (Water Quality Protection)
and Section 2.15.5 (Groundwater Recharge).
_____________________________________________________________________________________
Page 64 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2.14.3 Erosion and Sediment Control
An erosion and sediment control plan shall be provided. The
purpose of this plan is to prevent the release of silt, raw concrete,
concrete leachate and other deleterious substances into any ditch,
storm sewer, watercourse or ravine. Construction materials,
excavation wastes, overburden soils, or other deleterious substances
shall be disposed of or placed in such a manner as to prevent their
entry into any watercourse, ravine, storm sewer system, or restrictive
covenant area.
All siltation control devices shall be situated to allow for ready
access for cleaning and maintenance. Siltation control structures
shall be maintained throughout the course of construction and to the
end of the maintenance period (final acceptance). Changes in the
design of the structure shall be required if the proposed structure is
found to perform inadequately.
At minimum, the control plan shall provide the following:
a)
Section I: Narrative
-
Project description: A brief description of the nature and
purpose of the land- disturbing activity and the amount of
grading involved.
-
Existing site conditions: A description of the existing
topography, vegetation, and drainage.
-
Adjacent areas: A description of neighbouring areas, such
as streams, lakes, residential areas, and roads that might
be affected by the land disturbance.
-
Soils: A brief description of the soils on the site including
erodibility and particle size distribution (texture).
-
Critical areas: A description of areas within the developed
site that have potential for serious erosion or sediment
problems.
-
Erosion and sediment control measures: A description of
the methods that will be used to control erosion and
sediment on the site including, temporary erosion control
and temporary sediment control measures. Who will be
responsible for implementation? Financial guarantees may
be required to assure proper implementation.
-
Permanent stabilization: A brief description of how the site
will be stabilized after construction is completed.
-
Maintenance: A schedule of regular inspections and
repairs of erosion and sediment control structure, and the
person responsible for maintenance.
_____________________________________________________________________________________
Page 65 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
_____________________________________________________________________________________
Page 66 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
b)
Section II: Details
-
Detailed drawings: Enlarged dimensioned drawings of
such key facilities as sediment basin risers, energy
dissipaters, waterway cross-sections, and sediment
barriers.
-
Seeding and mulching specifications: Seeding dates,
seeding, fertilizing, and mulching rates in pounds per acre,
and application procedures.
-
Maintenance program: Inspection schedules, spare
materials needed, stockpile locations, and instructions for
sediment removal and disposal and for repair of damaged
structures.
c)
Section III: Calculations
-
Calculations and assumptions: Data for design storm used
to size pipes and channels and sediment basins and traps
(e.g., 10-year, 6-hour storm = 3.1 in.; i peak = 2.6 in./hr.),
design particle size for sediment trap efficiencies, basin
discharge rates, size and strength characteristics for filter
fabric, wire mesh, fence posts, etc. and other calculations
necessary to support drainage, erosion, and sediment
control systems.
-
Attachments: The erosion control plan shall be
accompanied by a grading plan.
2.15 Environmental Protection
2.15.1 Creek Setback Protection
An environmental review pursuant to applicable provincial and
federal legislation shall be completed where the top of bank of an
existing watercourse is located within 30 m of the property line of a
proposed development.
No new stormwater outfall is permitted into a natural watercourse
without approval from applicable provincial and federal authorities.
2.15.2 Water Quality Protection
Specific practices for the quality treatment of stormwater runoff shall
be applied to the paved surfaces of all multi-family residential,
industrial, commercial, public and institutional uses, or other areas
that provide communal vehicle parking, or where there is a specific
risk from other point source pollution.
Best Management Practices (BMP's) shall be implemented to protect
water quality where indicated above, or where required by the
Approving Officer.
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Page 67 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 2.11 summarizes potential BMP's and appropriate application.
These shall be considered and implemented where practical. This list
is not exhaustive and there may be alternatives which the Consulting
Engineer may wish to propose for review by the Approving Officer.
Table 2.11
Best Management Practice
Typical Applications
Coalescing plate Oil/Water separator
or equivalent (mandatory for noted
applications)
Gas stations, automotive service
facilities, auto recycling facility.
Engineered Treatment Unit
Parking lots, light industrial and
commercial sites
Biofiltration swales and rain gardens
All uses
Sump manholes and catchbasins with
trash hoods
All uses
Covered containment area
All commercial, industrial or
agricultural chemical handling
and storage areas.
Infiltration and groundwater recharge
systems
All uses
Constructed wetland / stormwater
detention
All uses
The noted Best Management Practices are intended for water quality
control and do not necessarily perform a function of runoff control.
2.15.3 Slope Stabilization
The implementation of stormwater management measures,
combined with controls on development adjacent to watercourses, is
intended to minimize the impact on the receiving watercourses.
a)
Setbacks
Disturbance too close to a slope bank can destabilize the
bank material and contribute to bank failures. In addition to
the environmental restrictions to working within the streamside
protection area of a natural watercourse, no disruption to the
native ground is permitted within a setback zone established
by a 4:1 slope measured from the bottom of the slope.
Detailed site investigations by a qualified Geotechnical
Consulting Engineer is required prior to the approval of any
development of disturbance within this setback zone.
_____________________________________________________________________________________
Page 68 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
b) Retention of Bank Vegetation
Existing vegetation along stream channel banks and within the
established riparian setback shall be retained, and the
disposal of debris within this setback is prohibited. The design
shall consider the erection of temporary fencing and flagging
during construction which clearly identifies the working limits
for the protection of the riparian setback.
c)
Storm Outfalls
The number of storm outfalls into natural watercourses shall
be minimized. All storm drains from private properties must
connect to a municipal system. Individual drains to natural
watercourses are not permitted unless specific approval has
been granted by provincial and federal agencies as well as the
Approving Officer.
2.15.4 Channel Erosion Protection
Where required and permitted by the approving authorities, bank
protection shall be considered along existing and new open
watercourses to provide adequate erosion protection in the form of
bank armoring, soil stabilization, flow deflection and other methods
applicable for the specific site conditions. Some of the optional
methods are summarized below. However, it is the Consulting
Engineer's responsibility to assess the requirements for and suitable
method of bank protection.
-
Grass lined and natural channels: Most suitable for longitudinal
gradients of 2% or less.
-
Rip-Rap protection: The selection of rip-rap protection shall
consider the flow velocities and scour of the underlying materials.
The use of granular material or geotextiles shall provide a
suitable barrier to prevent the migration of finer materials caused
by either the flow in the main channel or by flows from the
channel banks due to seepage.
-
Bio-Engineering: Bio-engineering methods of bank protection
shall be promoted wherever possible for the protection and
stabilization of watercourses. Bio-engineering solutions involve
the use of live plants and vegetation to provide bank lining and
cohesion of bank materials to resist scour. The plant materials
used will require anchoring to ensure long-term stability. Bio-
engineering solutions shall be compiled by the Consulting
Engineer with demonstrated expertise in this area.
It is noted that any proposed works within the streamside protection
area of an existing watercourse falls under the jurisdiction of the
Provincial or Federal governments, and as such, shall be subject to
their approval.
_____________________________________________________________________________________
Page 69 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2.15.5 Groundwater Recharge
The drainage characteristics of the surface soils in the City are
variable from one location to another. These conditions may provide
the opportunity to implement infiltration measures to reduce
stormwater runoff. All development proposals are encouraged to
implement on-site mitigative measures for the purposes of
groundwater recharge. For all commercial, institutional, multi-family
residential and industrial developments, the Consulting Engineer
shall submit a report prepared by a qualified hydrogeologist that
clearly identifies the specific opportunities and constraints for
implementing shallow groundwater recharge systems on-site. At a
minimum, this report shall present the following items:
-
Description of site condition, size and location.
-
Description of proposed development and resulting design flows.
-
Description of native soils and water table conditions on-site to a
depth of 5 meters.
-
Estimated infiltration rates for each strata of material within the 5
meter depth (complete with a description of seasonal variability.
-
Recommendations for recharge methods suitable for the
proposed development.
Based on the opportunities identified in the above noted
investigation, groundwater recharge systems may be approved, at
the discretion of the Approving Officer, either in lieu of stormwater
detention facilities, or to reduce stormwater detention requirements.
Requirements to incorporate recharge systems in the design shall be
reviewed by the Approving Officer on a site specific basis. However,
the Consulting Engineer is required to demonstrate that infiltration
potentials are being maximized, within reasons:
a)
Pre-Treatment
Particularly in multi-family, commercial, institutional and
industrial developments, all groundwater recharge systems
shall include pre-treatment measures to remove sediments,
suspended solids and greases prior to entering the infiltration
zone. Biofiltration is the preferred approach.
b)
Overflow System
Recharge systems shall be designed with sufficient volume to
maximize the opportunity for infiltration. However systems
contained within a municipal right-of-way, or where the
infiltration rate of the native sub-soils are questionable, an
overflow connected to the municipal drainage system which is
sufficiently sized for the 1:10 year peak discharge from the
site.
_____________________________________________________________________________________
Page 70 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
c)
Recharge Systems
Methods of groundwater recharge (infiltration) systems will be
approved by the Approving Officer on a site specific basis.
The proposed system shall satisfy long-term performance and
maintenance issues in order to be approved. Typical systems
supported by the City include the following:
-
Drywells
-
Rock pits
-
Perforated drains
-
Pre-manufactured modular infiltrator chambers (design as
per manufacturers recommendations)
_____________________________________________________________________________________
Page 71 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
SCHEDULE A-3 - SANITARY SEWER
3.1
Sanitary Sewer
Sanitary sewer systems shall be designed in accordance with the
requirements of this Bylaw.
3.2
Per Capita Flow
a) Sanitary sewer system design shall be based on an average daily dry
weather flow (ADWF) of 360 litres per day per capita (L/d/c).
b) For residential areas, the land use densities in Table 3.1 shall apply.
Table 3.1
People/Gross Ha.
People/Unit
Single Family
24-30
3
Multi-family Low
65
2
Multi-family Medium
(3 storey) 120
2
Multi-family High
(4-12 storey) 320-960
2
Mobile Home
40
2
3.3
Non-Residential Flows
a) Average dry weather flows (ADWF) for non-residential areas shall be
based on specific data related to the development or zoning. In the
absence of such data, use the above residential per capita flow and the
following equivalent population factors:
Table 3.2
Land Use
Equivalent Population/Hectare (gross)
Commercial:
120 people/ha
Institutional:
200 people/ha
Industrial:
200 people/ha
b) For identified commercial and institutional facilities, the ADWF shall be
as per Table 3.3.
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Page 72 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 3.3
FACILITY
UNIT
TYPICAL ADWF
L/(person or unit)/d
Assembly hall
Seat
8
Automobile dealer/renter
Hectare
30,000
Automobile service station
Set of
pumps
2,000
Car wash
Vehicle
served
5,000
Bed and breakfast
Patron
150
Bowling alley
Lane
800
Camp: Children's, central toilet and
bath
Person
180
Day, no meals
Person
50
Campground
Site
600
Curling club
Lane
8,500
Hospital
Bed
1,000
Hotel
Patron
300
Motel
Patron
500
Office
Employee
50
Picnic park, with flush toilets
Visitor
30
Restaurant: Conventional
Seat
150
24 hour
Seat
200
Tavern
Seat
80
School:
Day, with cafeteria or
lunchroom
Student
60
Day, with cafeteria and
showers
Student
70
Boarding
Student
400
Self-service laundry
Machine
2000
Shopping centre
m²
0.10
Swimming pool, with toilet and
shower
Patron
50
Theatre
Seat
15
_____________________________________________________________________________________
Page 73 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
3.4
Peaking Factor
The peaking factor is the ratio of peak dry weather flow (PDWF) to the
average dry weather flow (ADWF). The peaking factor shall be calculated
using the design residential population and non-residential equivalent
population, with the following formula:
PF = 3.2 _
Where:
PF = peaking factor
(P)0.105
P = residential population plus non-residential
equivalent population.
3.5
Infiltration/Inflow
Design flows shall include an infiltration allowance to cover groundwater
infiltration and system inflows as follows:
-
Pipes not in water table:
5,000 l/ha/d
-
Pipes in water table:
8,000 l/ha/d
3.6
Design Flow
Design flow Q (=PWWF) = population and equivalent x per capita flow x
peaking factor + infiltration/inflow allowance.
Design gravity sewers to flow at less than full depth as follows:
Sewer Diameter
Percentage of Diameter
150 mm and 200 mm
50% D
250 mm
60% D
300 mm and larger
70% D
3.7
Pipe Flow Formulas
a) Gravity Sewers
Use Manning's formula:
Q = AR0.667 S0.5
n
Where: Q = Design flow in m³/s
A = Cross sectional area in m²
R = Hydraulic radius (area/wetted
perimeter) in m
S = Slope of hydraulic grade line in m/m
n = Roughness coefficient
→ concrete = 0.013
→ PVC = 0.011
_____________________________________________________________________________________
Page 74 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
b) Sewage Force Mains
Use Hazen-Williams formula:
Q = CD2.63 S0.54 Where: Q = Rate of flow in L/s
278780
D = Internal pipe dia. in mm
S = Slope of hydraulic grade line in m/m
C = Friction coefficient
→ PVC = 130
→ Ductile, Concrete Cylinder, Steel = 120
3.8
Flow Velocities
a) Gravity Mains: The minimum velocity shall be 0.6 m/sec. There is no
maximum velocity. However, consideration shall be given to scour
problems and the dynamic loading on manholes where flow exceeds 3.0
m/sec. Anchoring shall be incorporated where the grade(s) of the sewer
are 15% or greater.
b) Force Mains: At the lowest pump delivery rate anticipated to occur at
least once per day, a minimum cleansing velocity of 1.0 m/sec shall be
maintained. Maximum velocity should not exceed 3.5 m/s.
3.9
Minimum Grades
a) Gravity Mains: The grade of any sewer is governed by the minimum
required velocity of 0.6 m/sec. If the calculated design flow is not
expected to produce a velocity of at least 0.6 m/sec., then the minimum
grade shall be calculated on the basis of the pipe flowing 35% full at a
theoretical velocity of 0.6 m/sec. However, the last section of a main
that will not be extended in the future shall have a minimum grade of
1.0% where 150 mm diameter pipe is proposed.
b) Forcemains: Forcemains shall be graded at a minimum of 0.5%.
Grading shall be designed to minimize high points. Provide air release
valves at high points.
3.10 Minimum Pipe Diameter
a) Gravity Mains:
-
For residential lands - 200 mm
-
For commercial and industrial - 250 mm
Terminal pipe section, upstream of the last intersection of mains, and
where no further extension is planned, shall be:
-
For residential lands - 150 mm at a minimum 1.0% grade
-
For commercial and industrial - 200 mm at a minimum 0.60% grade
_____________________________________________________________________________________
Page 75 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
b) Forcemains:
-
100 mm
c) Service Connection:
-
Residential - 100 mm
-
Multi-family/commercial/institutional - 150 mm
3.11 Alignment
Except as noted in 2.12, horizontal and vertical alignments shall be straight
lines between manholes.
3.12 Curved Sewers
Where permitted by the Approving Officer, horizontal curves may be formed
using pipe joint deflections as follows:
-
Minimum radius = 60 m.
-
Constant radius throughout curve.
-
Joint deflection not to exceed 75% of maximum recommended by pipe
manufacturer
-
Minimum design velocity = 0.9 m/s.
-
Curve locations to be recorded at ¼ points and midpoint
-
Constant offset from property line or road centerline
Where permitted by the Approving Officer, sewers larger than 600 mm
diameter may include deflections formed by mitred bends, with minimum
1.25 m straight sections and maximum 45° mitres.
3.13 Manholes
a) Locations
Manholes are required at:
-
Every change in grade, except as permitted for curved sewers
-
Every change in direction, except as permitted for curved sewers
-
Every change in pipe size
-
Downstream end of curved sewers
-
Every pipe intersection except for 100 mm and 150 mm service
connections and junctions with trunk sewers 900 mm and larger
-
150 m maximum spacing
-
Every future pipe intersection
-
Upstream end of every sewer main
_____________________________________________________________________________________
Page 76 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
Temporary clean-outs may be provided at terminal section of a main
provided that:
−
Future extension of the main is proposed or anticipated.
−
The length of sewer to the downstream manhole does not
exceed 45.0 m.
−
The depth of the pipe does not exceed 2.0 m at the terminal point
−
Clean-outs are not to be considered a permanent structure.
-
Sanitary manhole rim elevations outside of paved roadways shall be
designed to be:
−
Above the adjacent storm manhole rim elevation
−
Above the surrounding ground so that infiltration from ponding
will not occur.
b) Hydraulic Details
-
Crown elevations of inlet sewers shall not be lower than crown
elevation of outlet sewer.
-
Minimum drop in invert elevations across manholes:
−
Straight run: 5 mm drop
−
Deflections up to 45 degrees: 25 mm drop
−
Deflections 45 to 90 degrees: 50 mm drop
-
Drop manhole and ramp structures shall be avoided where possible
by steepening inlet sewers. Where necessary, provide drop
structures as follows:
Invert Difference
Structure
Up to 0.45 m
Inside Ramp
0.45 to 0.90 m
Outside Ramp
Greater than 0.90 m
Outside Drop*
-
Inside drop may be used if specifically permitted by the Approving
Officer.
-
The maximum deflection angle in a junction shall be 90°.
-
Force main discharges shall be directed into the receiving manhole
outflow pipe. Manhole benching shall be extended a minimum 200
mm above the force main crown. If a manhole drop cannot be
avoided, an inside drop pipe is required.
_____________________________________________________________________________________
Page 77 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
3.14 Depth and Cover
-
Depth shall be defined as the distance from the finished ground surface
to the top of pipe.
-
Sewers shall be of sufficient depth to
−
Permit gravity sewer service to the basements of properties
adjacent to the roadway or sewer right-of-way
−
Prevent freezing
−
Meet the minimum depth requirements of 1.5 m
−
Clear other underground utilities
−
Prevent damage from surface loading
−
Allow for future extension of the sanitary sewer system to service
upstream tributary lands at ultimate development, as defined by
the Approving Officer.
-
Maximum cover depth: 4.5 m, except under special circumstances and
with permission of Approving Officer.
3.15 Rights-Of-Way (R.O.W)
Right-of-way locations shall be selected to avoid environmentally sensitive
areas such as watercourses, wetlands and wildlife migration corridors and
forested areas.
Rear yard sewers are discouraged and will only be allowed with the
permission of the Approving Officer.
Where location of a municipal utility in a statutory right-of-way is permitted
by the Approving Officer, the minimum right-of-way widths are as follows:
-
Single service
R.O.W.
width =
twice the depth from surface to
the crown of the pipe [4.5 m
minimum width]
-
Two services within
the same trench
R.O.W.
width =
twice the depth from surface to
the crown of the deeper pipe
[5.5 m minimum width]
-
Two or more
services adjacent to
one another but in
separate trenches
R.O.W.
width =
cumulative widths for single
services
PLUS any difference to provide
the required separation [6 m
minimum width]
-
When the service is within a road allowance, and the distance from the
property line to the centre of the service is less than one half of the
width indicated above for a single service, the difference shall be
provided as right-of-way on the adjacent property.
_____________________________________________________________________________________
Page 78 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
In all cases, the width of rights-of-way shall be sufficient to permit an open
excavation with side slopes in accordance with the WorkSafe BC
regulations, without impacting on or endangering adjacent structures.
Where required, sanitary trunk and interceptor sewers shall have rights-of-
way wide enough for future widening and/or twinning. The width of the
right-of-way shall be the required separation between pipe centerlines plus
2 times the depth to the crown of the deeper sewer.
The Consulting Engineer shall provide cross sections indicating the
minimum safe distances to adjacent building footings based on a safe
angle of repose from the limits of the excavation.
Where a utility is located within a right-of-way, and valves, valve
chambers, manholes, or other appurtenances which require maintenance
are located within the right-of-way, provide road access from a public road.
The maintenance access shall be sufficiently wide and structurally
adequate to support the maintenance vehicles for which the access is
intended. Maximum allowable grade of the maintenance access is 12%.
3.16 Utility Separation
Requirements for separation of sanitary sewers from water mains are as
follows, unless otherwise indicated by the local public health authority.
a) Horizontal Separation
At least three (3) m horizontal separation shall be maintained between a
water main and a sanitary sewer.
In special circumstances, specifically in rock or where the soils are
determined to be impermeable, lesser separation than 3.0 m may be
permitted provided that:
-
The sewer main and water main are installed in separate trenches
and the water main invert is at least 0.5 above the crown of the
sanitary sewer and the joints are wrapped with heat shrink plastic or
packed with compound and wrapped with petrolatum tape in
accordance with the latest version of AWWA Standards C217, and
C214 or C209; or,
-
The pipes are installed in the same trench with the water main
located at one side on a bench of undisturbed soil at least 0.5 m
above the crown of the sanitary sewer and the joints of the water
main are wrapped with heat shrink plastic or packed with compound
and wrapped with petrolatum tape in accordance with the latest
version of the AWWA Standards C217, and C214 or C209.
_____________________________________________________________________________________
Page 79 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
b) Vertical Separation
Where a sanitary sewer crosses a water main, the sewer shall be below
the water main with a minimum clearance of 0.5 m and the joints of the
water main, over a length extending 3 m either side of the sewer main,
are to be wrapped with heat shrink plastic or packed with compound
and wrapped with petrolatum tape in accordance with the latest version
of the AWWA Standards C217, and C214 or C209.
Where it is not possible to obtain the vertical separation indicated
above, and subject to local public health authority approval, the
following details shall be used:
-
The water pipe joints shall be wrapped as indicated above, and
-
The sewer shall be constructed of pressure pipe such as high
density polyethylene (HDPE) or PVC with fused joints and pressure
tested to assure it is watertight.
c) Sewers in Common Trench
Sanitary and storm sewers may be installed in a common trench,
provided that the design has taken into account:
-
Interference with service connections,
-
Stability of the benched portion of the trench,
-
Conflict with manholes and appurtenances.
The horizontal clearance between sewer pipes shall be no less than 1.0
m and the horizontal clearance between manholes shall be no less than
0.3 m.
3.17 Service Connections
Every legal lot and each unit of a residential duplex shall be provided with a
separate service connection.
Unless otherwise permitted by the Approving Officer, connections are to
serve all plumbing by gravity. Building elevations should be established
accordingly. Pumped connections may be permitted if requested prior to
sewer design and if appropriate covenants are provided.
Service connections shall be provided to each lot fronting the main. Service
connections shall not be extended at an angle that exceeds 45° from
perpendicular to the main, and in no case shall a service connection be
placed so that it extends in front of any property other than the one being
serviced.
Each property is permitted only one service connection. In special
circumstances, where servicing of all buildings on existing industrial or
commercial properties is not feasible, two services may be allowed, if
permitted by the Approving Officer.
_____________________________________________________________________________________
Page 80 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Connections to new mains shall be made using standard wye fittings.
Connections to existing mains shall use wye saddles or, where permitted
by the Approving Officer, inserta-tees may be used. All services shall enter
the main at a point just below the spring-line.
The minimum grade from the main to the property line shall be 2.0%.
The minimum depth of a service at the property line must be 1.5 m
provided that gravity service to the Minimum Building Elevation is available.
Where rear yard sewers are necessary, due to steep topography, the
minimum cover must be 1.0 m provided that gravity service, to the
Minimum Building Elevation, is available.
Service connections may be permitted into manholes provided that:
-
the connection is not in an adverse direction to the flow in the sewer
main;
-
the connection enters the manhole so the service crown is no lower
than the sewer main crown.
Inspection chambers are required for all service connections, except when
the sewer main is in a right-of-way and the service is less than 2.5 m long
and ties into a manhole.
Control manholes are required for all industrial and light industrial
connections. Control manholes will be required for commercial connections
at the discretion of the Approving Officer.
Service connections shall be installed at the lower (downstream) portion of
the lot for larger lots or parcels of land. For residential development,
connections shall be as noted on the Standard Drawings.
The maximum length of any service connection is 30 m, unless permitted
otherwise by the Approving Officer.
3.18 Pump Stations
The use of pump stations shall be avoided where possible. Any proposed
use of pump stations shall receive prior approval from the Approving
Officer. Prior to commencing detailed design of a pump station, the
Consulting Engineer shall submit a pre-design report that addresses the
design considerations of this bylaw. Approval of the pre-design report shall
be obtained prior to the Consulting Engineer commencing detailed design.
a) Preliminary Design Requirements
-
System
Layout:
Select location(s) to minimize long-term total
number of pump stations.
-
Location:
Within right-of-way adjacent to road.
-
Capacity:
Dependent upon the development and catchment
area. Designs must consider short, intermediate
and long-term future flows.
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Page 81 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
- Configuration:
Submersible duplex pump system unless otherwise
approved in advance.
Other basic criteria include:
-
Construction dewatering requirements.
-
Access for construction and maintenance.
-
Aesthetics, noise, odour control and landscaping.
-
Water-hammer and/or column separation prevention measures.
-
Security against vandalism and theft.
-
Flood elevations and station uplift design.
-
Proximity of receiving sewers, water mains, and power supply.
-
Minimizing energy requirements.
-
Type of controls:
−
PLC compatible with City of Nelson Control System
−
Ultrasonic and backup float controls
−
SCADA connection or capability
-
Standby power.
-
Sub-surface investigations must be undertaken prior to site approval.
-
Convenience of operation and maintenance including service vehicle
access.
-
Safety for operators and public.
-
Capital costs and operation and maintenance costs.
-
Vehicle loads adjacent to and/or on station structure.
-
Davit and lifting arms for pumps and fall arrests. Station to be
complete with an Uninterruptible Power Supply (UPS) to serve
alarms and controls.
b) Design Features
1)
Pump stations shall be designed with a minimum of two pumps,
capable of handling the maximum flow condition with any one
pump off line.
Where the design flow exceeds the capacity of a single, commonly
available pump, use three or more pumps with capacities such that
there is always one pump available for standby.
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Page 82 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
2)
Pump requirements:
-
Capable of passing solids up to 75 mm in size.
-
Maximum motor speed: 1750 RPM.
-
Explosion proof.
-
600 volt 3 phase electrical power. Lower voltage or single
phase may be considered depending upon service voltage
available from the power utility.
-
Suitable for use with a variable speed drive.
-
Easily removed for maintenance.
-
Able to operate alternately and independently of each other.
-
Able to meet maximum flow condition with one pump in failure
mode.
-
Sized so that each motor does not cycle more than six times
in one hour under worst case operating conditions or less as
recommended by the pump manufacturer.
-
Motor over temperature and leak detection system.
3)
Ball type check valves or swing check with outside lever and
weight required on each pump discharge
4)
Gate valves required outside pump station on influent line and a
plug valve for each pump discharge line. The valves must be
outside the station and be complete with square operating nut,
riser, rock guard and nelson box.
5)
Provision(s) must be made for standby pumping from an external
source. An adaptor flange ("Kamlock") complete with a quick
coupling and lockable cap will be required. Minimum wet well size:
2.4 m diameter.
6)
Wet well bottom to be benched to direct solids to pump suction.
Wet wells to be designed in accordance with the latest edition of
the Hydraulic Institute Standards.
7)
Pump station lids to be waterproof and provided with locks. Covers
may be either aluminum or fiberglass. Minimum 900 mm x 900 mm
in size. Fasteners to be 316 stainless steel. Lids to be 200 mm to
300 mm above ground level.
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
The access hatch shall have:
-
An aluminum ¼" tread plate
-
A perimeter drain
-
A perimeter sealing gasket
-
A slam lock with an aluminum removable sealing plug and
opening tool
-
A flush lift handle
-
A gas spring assist cylinder
-
A 90 degree hold open arm
-
A flush fitting padlock tang
-
Hatch safety grate
The hatch shall be reinforced for 1465 kgs/m² (300 lbs./sq.ft.) or
withstand a loading of H-20 where subject to vehicular traffic. All
fasteners to be made of 316 stainless steel.
8)
Station access shall be by aluminum ladder. Ladder to be located
to avoid interference with removal and installation of pumps.
Ladder to be provided with extension and lock at least 600 mm
above station lid. Fibreglass grating platform to be provided above
high water level for wet well access. Access, ladder and platform to
meet Worksafe BC standards.
9)
A removable lifting arm and davit socket shall be incorporated into
the design of the pump station to facilitate the removal and
installation of the pumps.
10) Access shall be located 0.6 m above 200-year flood level or 1.0 m
above highest recorded flood elevation.
11) Metal stations shall be provided with impressed current cathodic
protection.
12) Steel and fiberglass surfaces to receive minimum two coats of two-
component white epoxy enamel. Concrete stations to be designed
to prevent sulphide attack.
13) Auxiliary equipment and control panels to be housed in
weatherproof kiosk adjacent to station. Kiosk to be located not less
than 2.0 m and nor more than 4.0 m from station lid.
14) Kiosk to contain separate compartment for pump station ventilation
fan.
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Page 84 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
15) Wet well ventilation shall be designed to address odor control, and
confined space entry to WCB and NFPA Standard 820.
16) Wiring in station and fan compartment to be explosion-proof, Class
1, Division 2. Electrical design and installation subject to approval
by Provincial Safety Inspector.
17) Power and control cables to be continuous from within the pump
station to within the kiosk.
18) Levels to be controlled by ultrasonic level transmitter, plus
emergency high and low level floats.
19) Unless otherwise permitted by the Approving Officer, controls to be
PLC based and connected to SCADA system.
20) Station to be complete with an Uninterruptible Power Supply (UPS)
to serve alarms and controls.
21) Control panel to include hour meter and ammeter for each pump.
22) 110V outlet for hand tools.
23) Station to include magnetic flow meter with local display and
connections to SCADA.
24) Pump control panel to incorporate operator interface with indicator
lamps, as follows:
Condition
Colour
Reset
Pump on, each pump
Green
Manual
Pump fail, each pump
Red
Manual
Pump motor overload, each pump
Red
Manual
Motor winding high temperature, each pump
Red
Manual
Moisture sensor, each pump
Red
Manual
Power failure
Red
Manual
High wet well level
Red
Manual
High intermediate wet well level
Red
Manual
Low wet well level
Red
Manual
All indicator lamps must be "push to test" type. Pump control panel
to incorporate operator interface (Panelmate or equivalent), and
the panel must be complete with a lamp text button.
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Page 85 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
25) Control kiosk to be designed to contain control and SCADA
equipment on front panel and power equipment on rear panel.
Concrete base to be minimum 75 mm above finished grade.
26) Pump stations to include automatic generator sets for standby
power in case of power failure. Generator set enclosures to be
weatherproof and to include noise control. For small pump
stations, emergency storage may be considered in place of
standby power. Emergency storage is to be based on 8 hours of
average day flows plus infiltration.
27) Noise levels for facilities must not exceed 65 dB at property line or
20 m away whichever is closer.
28) A 50 mm water connection with standpipe and cross-connection
protection must be provided on-site for cleaning purposes.
29) Area around station and related equipment or building is to be
graded, asphalted and fenced. Size of area to be determined by
maintenance requirements and minimum 1.2 m clearance to
structures with doors opened. Layout of structures and gates is to
provide for clearances for pump removal by hoist truck.
30) Design in accordance with appropriate seismic standards.
31) Equipment to be CSA approved and have minimum one-year
guarantee on parts and labour. All equipment must be tested prior
to acceptance.
32) Provide four copies of a comprehensive Operating and
Maintenance Manual, in hardback bound format with name of
facility embossed on cover. Manuals shall contain a table of
contents with each section identified by a plasticized, labeled
divider.
3.19 Corrosion and Odour Criteria
a) Dissolved sulphide maximum limit at any point in the system is to be 0.5
mg/l.
b) Odour Criteria:
-
At 10 m from any gravity main, force main, manhole and lift station
or other sewer facility (summer conditions, winds between 2-10
km/h), 1.0 odour units.
-
Where sewer facilities are close to houses, parks or walkways, 0.0
odour units.
c) Analysis for odour and sulphides may be required.
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Page 86 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
SCHEDULE A-4 - WATER DISTRIBUTION
4.1
Water Distribution
Water distribution systems shall be designed in accordance with the
requirements of this bylaw.
4.2
Per Capita Demand
For residential areas, use the following per capita demands:
-
Average annual daily demand (A): 600 litres per capita per day (L/c/d)
-
Maximum day demand (D): 1,200 litres per capita per day
-
Peak hour demand (H): 1,800 litres per capita per day
4.3
Non-Residential Demand
c) Commercial, industrial and institutional demands should be determined
using specific data related to the development of zoning. In the absence
of such data, use the above residential per capita demands and the
following equivalent population factors. The equivalents apply to the
average annual daily demand (A). For maximum day (D) and peak hour
(H), use the ratios indicated above for per capita demands, i.e. D=2.0A
and H=1.5D.
Table 4.1
Land Use
Equivalent Population/Hectare (gross)
Commercial:
90 people/ha
Institutional:
50 people/ha
Industrial:
90 people/ha
d) For identified commercial and institutional facilities, (A), the average
annual daily water demands shall be as per Table 4.2.
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Page 87 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 4.2
Facility
Unit
Typical Average
Annual Daily
Water Demand
L/(person or
unit)/d
Assembly hall
Seat
8
Automobile dealer/renter
Hectare
30,000
Automobile service station
Set of pumps
2,000
Car wash
Vehicle served
5,000
Bed and breakfast
Patron
150
Bowling alley
Lane
800
Camp: children's, central toilet &
bath
Person
180
Day, no meals
Person
50
Campground
Site
600
Curling club
Lane
8,500
Golf course
Hectare
1,500
Greenhouse
Hectare
27,000
Hospital
Bed
1,000
Hotel
Patron
300
Ice arena
Rink
85,000
Motel
Patron
500
Office
Employee
50
Picnic park, with flush toilets
Visitor
30
Restaurant: Conventional
Seat
150
24 hour
Seat
200
Tavern
Seat
80
School:
Day, with cafeteria
or lunchroom
Student
60
Day, with cafeteria &
showers
Student
70
Boarding
Student
400
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Page 88 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Table 4.2
Facility
Unit
Typical Average
Annual Daily
Water Demand
L/(person or
unit)/d
Self-service laundry
Machine
2,000
4.4
Fire Flows
a) Fire flows should be determined in accordance with the requirements of
the current edition of "Water Supply for Public Fire Protection - A Guide
to Recommended Practice", published by Fire Underwriters Survey.
b) Fire flows are also subject to the following minimum requirements:
Table 4.3
Developments (without sprinklers)
Minimum Fire Flow
Single Family Residential
60 L/s
Apartments, Townhouses
90 L/s
Commercial
150 L/s
Institutional
150 L/s
Industrial
225 L/s
4.5
Design Flows
a) System design flows should be based on the ultimate population and
fully developed non-residential land as anticipated in the Official
Community Plan (OCP).
Equivalent populations for non-residential flows can be estimated using
the established non-residential demands and the Maximum Day per
capita demand.
b) Total design flows (Qdesign) are to be greater of the following:
Qdesign = D+F
Maximum Day Demand for the population or
equivalent population plus the Fire Flow, or
Qdesign = H
Peak Hour Demand for the population or equivalent
population
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Page 89 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
4.6
Water Pressure
Table 4.4
Maximum allowable pressure
850 kPa*
Minimum pressure at Peak Hour
Demand (H)
300 kPa
Minimum pressure in system during
design
Fire Flow and Maximum Day Demand
(D+F)
150 kPa
*Where permitted by the Approving Officer, the maximum allowable
pressure may be increased to 1,035 kPa for systems with multiple pressure
zones.
Where the maximum pressure exceeds 515 kPa, service connections must
be individually protected by pressure reducing valves located in the
buildings being served.
Determination of pressure limits should include consideration of property
elevations relative to street level.
4.7
Hydraulic Design
a) Use a proven network analysis computer model based on the Hazen-
Williams formula:
Q = CD2.63S0.54 Where:
Q = Rate of flow in L/s
278780
D = Internal pipe diameter in mm
S = Slope of hydraulic grade line in m/m
C = Roughness coefficient
= 125 for all pipes
b) the maximum allowable design velocity under fire flow conditions should
be 3.5 m/s.
4.8
Minimum Pipe Diameter (amended by BL 3615, 2024)
Table 4.5
Distribution mains:
200 mm
Fire hydrant connections:
150 mm
Service connections:
25 mm
Where permitted by the Approving Officer, distribution main minimum
diameter may be reduced to 150 mm provided that the main terminates in a
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Page 90 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
short residential cul-de-sac, has a length less than 80 m and serves no fire
hydrants.
4.9
Dead Ends
Watermains shall be looped wherever possible. Where dead ends are
unavoidable, and where permitted by the Approving Officer, blow-offs or
blow-downs shall be provided. Blow-off and blow-down sizes are:
-
50 mm diameter for 150 mm diameter water-mains.
-
100 mm diameter for 200 mm diameter and larger water-mains.
Where practical, a hydrant may serve a secondary role as a blow-off.
4.10 Minimum Depth of Cover
Depth of cover shall be determined on the distance from finished ground
surface to top of pipe. Water-mains and services must be of sufficient depth
to:
-
Prevent freezing. Minimum 1.5 m cover.
-
Clear other underground utilities.
-
Provide mechanical protection from external loads.
-
Clear other underground utilities.
Provide special consideration for frost and mechanical protection in cases
where minimum depths cannot be attained, e.g. at bridge crossings and in
chambers.
4.11 Grade
Grades shall be straight lines between defined deflection points. Elevations
shall be recorded.
Where possible, minimum grade of water-mains shall be 0.1%. Grading
shall be designed to minimize the number of high points.
When the slope equals or exceeds 20%, provide anchorage, joint
restraints, trench dams and trench drainage. Provide geotechnical
engineering report where appropriate.
4.12 Corrosion Protection
Where there is a potential for encountering corrosive soils, a geotechnical
corrosion analysis on the alignment of any proposed metallic water-main
shall be conducted to determine the corrosiveness of the native soils. If the
soils are determined to be corrosive, measures such as cathodic protection
shall be included to prevent the corrosion of the water-main and
appurtenances.
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Page 91 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
4.13 Valves
In general, valves should be located as follows:
-
In intersections either in a cluster at the pipe intersection or at projected
property lines to avoid conflicts with curbs and sidewalks:
- 4 valves at "X" intersection
- 3 valves at "T" intersection
-
Not more than 200 m apart
-
Not more than 1 hydrant isolated
-
Not more than 20 service connections isolated.
Gate valves are required on all mains.
4.14 Hydrants
Fire hydrants shall be located, in general, at street intersections and as
follows:
-
Not more than 150 m apart or more than 90 m from a building.
-
In accordance with "Water Supply for Public Fire Protection - A Guide
to Recommended Practice" published by Fire Underwriters Survey.
-
2.0 m back from curb or 0.5 m back of sidewalk.
-
Minimum 1.0 m clear of any other utility structure.
-
At property lines in mid-block locations.
4.15 Air Valves
Combination air valves shall be installed at the summits of all mains of 200
mm diameter and larger, except as follows:
-
Where the difference in elevation between the summit and valley is less
than 600 mm.
-
Where it can be shown that air pockets will be carried by typical flows.
-
Where active service connections are suitably located to dissipate
entrapped air.
Typical air valve sizes, subject to design analysis, are as follows:
Table 4.6
Water-main Size
Valve Size
200 mm to 300 mm
25 mm
350 mm to 600 mm
50 mm
Larger than 600 mm
Special design
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Page 92 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
Air valves shall be vented to an appropriate above-grade location to
eliminate any potential for cross connection in a flooded or contaminated
chamber.
4.16 Thrust Restraint
Concrete thrust blocking and/or adequate joint restraining devices shall be
provided at bends, tees, wyes, reducers, plugs, caps, valves, hydrants and
blow-offs.
The restraint system shall take into account potential future excavations in
the vicinity of the water-main. Design calculations shall be based on fitting
type, water pressure and soil conditions.
4.17 Chambers
Chambers or manholes containing valves, blow-offs, meters, or other
appurtenances shall allow adequate room for maintenance, including
headroom and side room. Access openings shall be suitable for removing
valves and equipment. The chamber shall be provided with a drain to storm
sewer or ditch, complete with backflow prevention, to prevent flooding of
the chamber. Rock pits may be considered, subject to suitable soil and
groundwater conditions. A pumping system may be required for drainage.
Adequate venting shall be provided. The Approving Officer may require
provision of forced ventilation, lighting, heating and dehumidification.
Access and ventilation details shall comply with WCB requirements.
Insulation to prevent freezing shall be provided where necessary.
4.18 Service Connections (amended by BL 3615, 2024)
Service connection size shall be calculated based on the designated land
use including sprinkler systems and/or on-site hydrants, where applicable.
The minimum size of new or replacement service connections is
established in Table 4.5 of this Schedule.
Notwithstanding the minimum service connection size established in Table
4.5 of this Schedule, provided that the property does not have a fire
sprinkler system, the City will not require the replacement or upgrade of the
portion of an existing water service connection located on the municipal
right-of-way to allow for the addition of secondary suites or laneway houses
to a property with an existing residential building.
Notwithstanding, a lot containing a laneway house must have a water
service connection of a minimum of 19 mm.
Each service shall have a shut-off located within 300 mm of the property
line on the public side. Each connection of 100 mm diameter or larger
requires a backflow prevention device at the property side of the shut-off.
All service connections shall be metered to City Standard.
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Page 93 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
4.19 Alignment
Except as noted in 4.20, water-mains shall have straight alignments, with
uniform offsets between intersections.
Mains shall be located such that each property served has at least one side
facing the water-main.
4.20 Rights-Of-Way (R.O.W)
Right-of-way locations should be selected to avoid environmentally
sensitive areas such as watercourses, wetlands and wildlife migration
corridors and forested areas.
Where location of a municipal utility in a statutory right-of-way is permitted
by the Approving Officer, the minimum right-of-way widths are as follows:
-
Single service
R.O.W.
width =
twice the depth from surface to
the crown of the pipe [4.5 m
minimum width]
-
Two services within
the same trench
R.O.W.
width =
twice the depth from surface to
the crown of the deeper pipe
[5.5 m minimum width]
-
Two or more
services adjacent to
one another but in
separate trenches
R.O.W.
width =
cumulative widths for single
services
PLUS any difference to provide
the required separation [6 m
minimum width]
-
When the service is within a road allowance, and the distance from the
property line to the centre of the service is less than one half of the
width indicated above for a single service, the difference should be
provided as right-of-way on the adjacent property.
In all cases, the width of rights-of-way shall be sufficient to permit an open
excavation with side slopes in accordance with the WorkSafe BC
regulations, without impacting on or endangering adjacent structures.
Where required, sanitary trunk and interceptor sewers should have rights-
of-way wide enough for future widening and/or twinning. The width of the
right-of-way should be the required separation between pipe centerlines
plus 2 times the depth to the crown of the deeper sewer.
The Consulting Engineer shall provide cross sections indicating the
minimum safe distances to adjacent building footings based on a safe
angle of repose from the limits of the excavation.
Where a utility is located within a right-of-way, and valves, valve chambers,
manholes, or other appurtenances which require maintenance are located
within the right-of-way, provide road access from a public road. The
maintenance access must be sufficiently wide and structurally adequate to
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Page 94 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
support the maintenance vehicles for which the access is intended.
Maximum allowable grade of the maintenance access is 12%.
4.21 Curved Water-mains
Where permitted by the Approving Officer, horizontal curves may be formed
by arcing the pipe barrel as follows:
-
Radius and curvature not less than 60 m.
-
No deflection at pipe joints.
-
Constant radius throughout curve.
-
Curvature limited to half of maximum curvature specified by pipe
manufacturer.
-
Curve locations to be recorded at ¼ points and mid-point.
-
Constant offset from property line or road centerline.
4.22 Reservoirs
a)
Preliminary Design Requirement
Reservoir design shall include a preliminary design report which is to
be accepted by the Approving Officer before detailed design begins.
Preliminary design shall cover the following issues:
-
Selection of materials (concrete or steel)
-
Design standards
-
Volume
-
Shape
-
Number of cells
-
Geotechnical report on foundation conditions
-
Aesthetics
-
Water Quality and reservoir piping
b)
Capacity
Reservoirs shall be designed to suit the particular circumstances.
Reservoir capacity shall be calculated by the following formula:
Total Storage Volume = A + B + C
Where:
A = Fire Storage (from Fire Underwriters Survey guide)
B = Equalization Storage (25% of Maximum Day Demand)
C = Emergency Storage (25% of A + B)
Subject to the results of a detailed engineering analysis, and
approval of the local authority, the requirement for emergency
storage (C) may be reduced or eliminated based on consideration of
the following:
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Page 95 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
Dependability of water source
-
Reliability of supply system
-
Presence of more than one supply source
-
Whether the reservoir is part of a large system
-
Presence of other reservoir(s) in system
-
Availability of standby power
c)
Structural Design Codes
Design in accordance with the latest edition of the BC Building Code
and as applicable the following specialty codes:
-
American Concrete Institute (ACI) 350/350R: Code
Requirements for Environmental Engineering Concrete
Structures, and Commentary
-
Portland Cement Association (PCA): Circular Concrete Tanks
Without Pre-stressing
-
ACI 350/350R: Seismic Design of Liquid Containing Concrete
Structures, and Commentary
-
American Waterworks Association (AWWA) D110: AWWA
Standard for Wire and Standard-Wound Circular Pre-stressed-
Concrete Water Tanks
-
AWWA D115: AWWA Standard for Circular Pre-stressed
Concrete Water Tanks with Circumferential Tendons
-
AWWA D100: AWWA Standard for Welded Steel Tanks for
Water Storage
-
AWWA D103: AWWA Standard for Factory-Coated Bolted Steel
Tanks for Water Storage
d)
Design Features
-
Seismic Loading: Design for the following:
−
Watertight structure and fully operational mechanical
equipment, following a 475-year return period earthquake.
−
Repairable damage and no uncontrolled release of water
following a 2500-year return period earthquake.
-
Two cells, each containing one-half of total required volume and
capable of being drained and filled independently. A single cell
reservoir may be considered under the following circumstances:
−
Total volume less than 4500 m³.
−
Alternative storage available (another reservoir in system).
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Page 96 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
−
Alternative supply source available.
−
Alternative storage or supply source scheduled to be
available within five years.
-
Overflow drain sized to handle the maximum design inflow.
-
Separate inlet and outlet pipes, located and oriented to provide
circulation within the reservoir.
-
Independent drain outlet at bottom, with consideration given to
discharge route, capacity and any environmental concerns.
-
Roof access hatch sized and located for safe and convenient
access for personnel, parts, temporary ventilation facilities and
cleaning equipment into each cell.
-
Hatches: watertight aluminum, complete with hinges and related
hardware, drains, locks and intrusion alarms.
-
Ventilation pipes or openings sized to handle appropriate intake
and exhaust air volumes for filling and draining the reservoir.
Include security considerations, bird screens, and snow
clearance.
-
Reservoir floor to slope to drain sump in concrete structures and
in steel structures where possible. Drain as low as possible in
steel reservoirs.
-
Drain sump in concrete reservoirs to be minimum 1,000 mm x
1,000 mm x 400 mm; invert of drain pipe to be flush with sump
floor; grating to be installed over sump.
-
Zoned sub-drains under floor to collect, drain and allow
monitoring of any leakage.
-
Stairways or stainless steel or aluminum interior wall ladder from
roof access to floor. All ladders and stairs to meet WCB
regulations, including attachment points for fall arrest equipment.
-
Fall prevention railings.
-
All pipework within the reservoir to be PVC, stainless steel,
fiberglass or steel or ductile iron coated to AWWA standards.
-
All metal parts within the reservoir including bolts, nuts, screws,
anchors, ladders, etc. to be stainless steel.
-
Pressure transducer or ultrasonic level controls for each cell.
-
Sample lines for at least one sample per 1,000 m³ volume within
each cell.
-
Wash-down connection in each cell, complete with backflow
preventer and 65 mm diameter pipe.
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Page 97 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
Convenient vehicle maintenance access conforming to Schedule
1.
-
Fencing, lighting, locks, ladder guards, alarms and other security
facilities to minimize vandalism and prevent water contamination.
-
Site finishing to suit location and surrounding land uses.
e)
Valve Chamber
Reservoir piping is to incorporate a valve chamber with the following
design features:
-
Chamber to include all valves associated with the reservoir
operation
-
Design in accordance with seismic codes noted above
-
Entrance at grade large enough to permit safe removal of largest
equipment
-
Lifting beams and hoists where necessary to enable removal of
equipment
-
Space for safe and convenient operating and maintenance
access to all valves, piping, equipment and instruction
-
Interior and exterior of all steel piping to be coated to AWWA
standards, or, alternatively, use stainless steel. Steel pipe in
contact with potable water to use products that are NSF 61
certified.
-
Floor drains and drainage system
-
Located above 200-year flood level or 1.0 m above highest
recorded flood elevation
Additional features, which may be required subject to system
operations details, include the following:
-
Sampling ports for inlet, outlet and reservoir water
-
Flow measurement and recording
-
Heat, light and ventilation
-
PLC-controlled inlet valve and level monitoring and control
system
-
Connection to SCADA system
-
Uninterruptible power supply (UPS) for control system
-
Chlorine residual analyzer for reservoir inlet and outlet
-
Provision for re-chlorination facilities
-
Four copies of a comprehensive Operations and Maintenance
Manual. Manual shall be hard-backed bound documents with the
name of the facility embossed on the cover. Manuals shall
_____________________________________________________________________________________
Page 98 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
contain a table of contents with each section identified by a
plasticized, labeled divider.
4.23 Pump Stations
a)
Preliminary Design
Pump station design shall include a preliminary design report which
is to be accepted by the Approving Officer before detailed design
proceeds. The preliminary design shall follow a 'systems based'
approach which addresses the performance of the pump station and
the supply and distribution network together. Preliminary designs
shall include the following issues:
-
Location
-
Capacity
-
Hydraulics (Pressure, NPSH, pump RPM, efficiencies)
-
Water hammer analysis and mitigative measures
-
Number and type of pumps
-
Preliminary piping layout
-
Type and appearance of structure
-
Foundation conditions
-
Maintenance requirements and access
-
Energy requirements (sustainability, energy efficiency)
-
Standby power
-
HVAC
-
Aesthetics
-
Noise
-
Controls and monitoring, including process and instrumentation
drawing and control narrative.
-
Life cycle costs
-
Operations
b)
Capacity
Pumping capacity shall be designed to suit the particular
circumstances. In general, capacity should meet maximum day
demand with the largest pump out of service and balancing storage
on line. If balancing storage is not on line, pumping capacity should
meet peak hour demand with the largest pump out of service. Stand-
by power should be provided to allow the greater of maximum day
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
demand plus fire flow or peak hour demand (D+F, or H) during a
power outage.
c)
Design Features
-
Structure, piping and mechanical systems designed in
accordance with seismic codes for post-disaster structures.
-
Located above 200-year flood level or 1.0-m above highest
recorded flood elevation.
-
Reinforced concrete, block-work or brick construction designed to
incorporate aesthetic considerations.
-
Access doorways sized for safe and convenient removal and
replacement of the largest piece of equipment. Lifting hooks or
rails with hoisting equipment as required.
-
Adequate HVAC and lighting.
-
Standby power, unless fire storage and balancing and/or
emergency storage is available without pumping.
-
Electric motors to be 600 volt, 3-phase, premium efficiency, with
thermal protection. Lower voltage (208V, 3-phase)single phase
may be considered, depending upon service voltage available
from the power utility.
-
Electrical motors to be suitable for use with a Variable Frequency
Drive (VFD).
-
Motors 100 HP and above to have analog vibration recording and
protection.
-
Air relief discharge and pilot lines to be piped to floor drains.
-
Housekeeping pads for MCCs.
-
Hydraulically operated or motorized pump control valves with
isolation valves, unless pumps have variable speed drives which
control transient pressures.
-
Totalizers.
-
Spring return "Silent" check valves.
-
High pressure and surge relief valves or VFDs with isolation
valves, if warranted by system characteristics and transient
analysis.
-
Suction and discharge pressure gauges, with isolation valves, for
each pump.
-
Discharge pressure transducer for connection to SCADA.
-
Mechanical pump seals.
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
Water quality sampling ports.
-
Interior and exterior of all steel piping to be coated to AWWA
standards, or, alternatively, use stainless steel. Steel pipe in
contact with potable water to use products that are NSF 61
certified.
-
Pump system to be PLC-controlled and connected to SCADA
system. PLC to conform to current City of Nelson standard.
-
120 V power outlet for small tools.
-
Hour meters and ammeters for each pump.
-
Power factor correction, if required by power company.
-
Noise attenuation to suit the location and local authority
standards.
-
Equipment to be CSA approved and have minimum one-year
guarantee on parts and labour. All equipment must be tested
prior to acceptance.
-
Off-road vehicle parking.
-
Four copies of a comprehensive Operating and Maintenance
Manual. Manual shall be hard-backed bound documents with the
name of the facility embossed on the cover. Manuals shall
contain a table of contents with each section identified by a
plasticized, labeled divider.
4.24 Pressure Reducing Valve (PRV) Stations
Prior to commencing detailed design of a PRV, the Consulting Engineer
shall submit a preliminary design report that addresses the design
considerations of this bylaw. Approval of the preliminary design report shall
be obtained prior to the Consulting Engineer commencing detailed design.
a)
Preliminary Design Parameters
-
Design flows:
−
Peak hour
−
Maximum day plus fire
−
Continuous, emergency or fire flow operation
−
Location
-
Chamber details:
−
Structure and access
−
Controls and monitoring
−
HVAC
−
Lighting
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
b)
Design Features
-
Above ground building; minimum size: 3 m x 4 m x 2 m (inside
dimensions).
-
Sump drain to drainage system.
-
Structure and piping in accordance with Chambers, Reservoirs,
and Pump Stations sections.
-
External bypass with closed valve.
-
Parallel pressure reducing valves sized for peak hour and
maximum day plus fire flows.
-
Isolating valves.
-
Air release valves.
-
Off-street parking.
-
Strainers upstream of each control valve complete with flushing
capability equipped with Kamlock connector.
-
Upstream and downstream pressure gauges.
-
Water quality sampling ports.
-
Magnetic flow-meter with SCADA connection.
-
Interior and exterior of all steel piping to be coated to AWWA
standards, or alternatively use stainless steel. Steel pipe in
contact with potable water to use products that are NSF 61
certified. Forced air ventilation plus heat and light, subject to local
authority review.
-
External kiosk and antenna, if electrical and electronic equipment
is included.
-
PLC-controlled with connection to SCADA system, if applicable,
including:
−
Discharge and suction pressure transmitters
−
Flow transmitter
−
Uninterruptible power supply (UPS)
−
Operator interface panel
-
Four copies of a comprehensive Operating and Maintenance
Manual. Manual shall be hard-backed bound documents with the
name of the facility embossed on the cover. Manuals shall
contain a table of contents with each section identified by a
plasticized, labeled divider.
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Page 102 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
SCHEDULE A-5 - STREET LIGHTING
5.1
General
Design of street lighting systems shall be prepared by the Consulting
Engineer. Street lighting shall be designed in accordance with the
requirements of the latest edition of the Nelson Hydro Bylaw, as amended.
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Page 103 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
SCHEDULE A-6 - RETAINING WALL SYSTEMS AND ALTERATIONS
6.1
Conditions Requiring Retention
Retention of land shall be required in the following conditions:
a) Where it is deemed necessary, by the Approving Officer to provide
stability to existing or altered slopes or to control potential erosion.
b) Where the slopes either existing or altered are steeper than their natural
geological angle of repose or steeper than 2 horizontal to 1 vertical
whether terraced or otherwise.
c) Where it is deemed necessary to protect works and services or provide
access to works and services.
d) Where it is deemed necessary to retain other land or structures.
e) Where it is deemed necessary to control surface drainage by altering
the contours of the land.
6.2
Design and Inspection (amended by BL3448)
a) The design and inspection of any retention system or structure shall be
prepared and carried out by the Consulting Engineer who shall be
responsible to acquire geotechnical consultation and advice where
conditions present the need for it.
b) Consideration shall be given to the aesthetic appearance of retention
structures. The following types of structures will not be permitted as
permanent structures:
i) LOCK BLOCKS (concrete blocks approximately 750 mm x 750 mm x
1,500 mm) unless:
-
No more than two (2) courses of blocks are exposed with the top
surface being flat without locking stubs; and
-
Ends of the system include sloping transition blocks where
topography is sloping; and
-
Exposed faces and surfaces, including the top surfaces of such
system, are faced or surfaced with either exposed aggregate or
granite finish;
-
Geogrid reinforcing is installed between each horizontal row of
blocks.
ii) GABION (wire baskets filled with rocks) except for in-stream or
waterfront erosion protection, not more than two (2) baskets high.
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
iii) WOOD CRIB (over one (1) metre high or terraced at a slope steeper
than (2) horizontal to one (1) vertical).
iv) When a retaining structure is to be sited where it would not have
significant visible impact from Public Lands or a Highway, alternative
design standards may be approved by the Approving Officer.
c) Stacked Rock Walls
i) In accordance with 6.2 (a).
d) Guardrails or Fences
i) Guardrails or fences shall be required at the top of retention
structure where the difference in elevation between adjacent levels
exceeds 1 metre.
ii) Landscaping alternatives may be used providing it is of a dense
thorny type to discourage access to the top of the retention structure
area and providing the difference in elevation between adjacent
levels does not exceed 1.5 metres.
6.3
Submissions for Retention Structures
a) Engineering submissions are required for all retention structures which
are more than 1.2 m high and/or terraced at a slope steeper than 2
horizontal to 1 vertical.
b) Submissions shall be accompanied by the following documentation
signed and sealed by the Consulting Engineer.
i) Scaled structural, geotechnical and drainage details.
ii) Scaled site plan showing the location of the retention structures in
relation to any property lines. Rights-of-way or easements, tanks,
other structures, underground works or services or natural features
and confirmed by a Surveyor if deemed necessary.
iii) Letters of Assurance of Design and Field Review.
6.4
Completion of Retention Works
a) The Owner shall take all necessary measures, temporary and
permanent to provide any necessary protection.
b) All required retention works are required to be completed prior to:
i) Substantial Completion of a subdivision, or
ii) Occupancy of a building in a development.
c) In the event that an extension of time is necessary, the Owner shall
provide to the City:
i) A security deposit in an amount equal to the cost of the outstanding
work, accompanied with an agreed upon time schedule to complete
the work.
_____________________________________________________________________________________
Page 105 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
SCHEDULE A-7 - LANDSCAPING
7.1
Objectives
These design standards are intended to enhance the safety, aesthetics and
sustainability of public lands and to ensure efficiency and effectiveness of
maintenance and operations of these lands.
7.2
Related Standards
This standard shall be referenced to and integrated with, at minimum, the
following:
-
BC Landscape Standard, Current Edition.
-
National Guide to Sustainable Municipal Infrastructure (Canada).
-
Irrigation Association - Turf and Landscape Irrigation Best Management
Practices.
7.3
Application of Standard
These standards apply to the following types of Public Lands:
-
Parks and Public Open Spaces.
-
Boulevards.
-
Medians.
-
Roundabouts, Traffic Circles and Cul-de-sac Islands.
-
Recreation Corridors.
-
Public Access Routes.
-
Stormwater Management Facilities.
-
Erosion Control.
7.4
Landscape Consultant
The Owner shall retain a Landscape Consultant to be directly supervised
by a Landscape Architect or a Registered Irrigation Designer. All
Landscape drawings and specifications shall be sealed by a professional
Landscape Architect. Irrigation drawings and specifications shall be
prepared by a Registered Irrigation Designer.
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Page 106 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
7.5
Landscape Plan
The Landscape Designer shall consider, at minimum, the following criteria:
-
The functional relationship of the landscape design to existing and
proposed land uses, utilities, flood patterns, drainage facilities, roads,
driveways and pedestrian facilities.
-
Accessibility as it relates to pedestrians, cyclists and people with limited
physical or visual abilities.
-
Horticultural use of plant material, including plant suitability, survival
rate, growth habit, size, disease resistance and water demand.
-
Appearance of the proposed plant material and site landscape,
including appropriateness, aesthetics, visual screening and site lines.
-
Protection of existing trees.
-
Protection of the natural environment and restoration or enhancement of
natural habitat.
-
Site drainage, water levels, ponding and overland flow.
-
Minimization of the opportunity for crime and undesirable behaviour.
-
Weed control.
-
Erosion control.
-
Fire hazard reduction.
-
The estimated costs and efficiency of maintenance practices that will be
required for the Public Land.
-
Restoration of disturbed areas.
7.6
Boulevards
Boulevards within public road rights-of-way having an urban cross-section:
-
For boulevards of collector roads the landscape treatment shall include:
➢ Grass surface with street trees, if the land use of the adjacent
property is commercial, industrial, institutional or multi-family, and
including complete irrigation system provided and maintained by the
Owner(s) of the adjacent property; or
➢ Grass surface with street trees, if the land use of the adjacent
property is one, two-family residential or park and if the boulevard is
accessible for maintenance (i.e., mowing, watering) from the
adjacent property; or
➢ Exposed aggregate concrete surface with street trees in tree wells
with structural soil. Provision of irrigation and tree grates shall be at
the discretion of the Approving Officer.
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City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
Underground utilities in boulevards shall be aligned and buried to
provide a continuous 1.0 m deep utility-free trench to accommodate tree
planting, except as required for utility crossings, service connections,
boxes and vaults.
7.7
Medians
-
Landscape treatment shall generally include continuous exposed
aggregate concrete surface with irrigated trees in concrete tree wells
with structural soil or, where appropriate, with a central band of irrigated
landscaping (i.e., groundcovers and/or low shrubs with regularly spaced
trees) as lines of sight permit.
7.8
Roundabouts, Traffic Circles and Cul-de-sac Islands
The following guidelines are the minimum requirements for all landscape
works and services in roundabouts, traffic circles and cul-de-sac islands:
-
The central area may, as lines of sight permit, feature a single specimen
tree or a group of like trees with low groundcovers and/or shrub
plantings.
-
For landscaped roundabouts, traffic circles and cul-de-sacs a complete
and working automatic irrigation system shall be provided.
-
Lighting of trees or public art in a traffic circle shall be provided as
required by the Approving Officer.
7.9
Stormwater Management Facilities
a)
Wet Ponds
-
Between the normal water level and the top of bank the side
slopes shall be naturalized with low maintenance riparian
plantings in 100 mm minimum depth growing medium.
-
Above the top of bank the ground surface shall be turf on 50 mm
depth smooth growing medium, with a maximum slope of 4
(horizontal) to 1 (vertical), except as required for vehicle access
and pedestrian surfaces.
-
Shrubs and trees shall be selected, planted and maintained to
provide screening, habitat, shade and aesthetics as required.
-
Irrigation system per 7.12.
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Page 108 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
b)
Dry Ponds
-
The bottom of dry ponds and infiltration basins shall be turf on 50
mm depth smooth growing medium or, if approved or required by
the Approving Officer, hard-surfaced recreational surface.
-
Side slopes with a 4 (horizontal) to 1 (vertical) or shallower slope
shall have a turf surface on 50 mm minimum depth smooth
growing medium. Side slopes steeper than 4 (horizontal) to 1
(vertical) slope shall be naturalized with low maintenance riparian
plantings in 100 mm minimum depth growing medium.
-
Above the design high water level the ground surface shall be
turf on 50 mm depth smooth growing medium, with a maximum
slope of 4 (horizontal) to 1 (vertical), except as required for
vehicle access and pedestrian surfaces.
-
Shrubs and trees shall be selected, planted and maintained to
provide screening, habitat, shade and aesthetics as required.
-
Irrigation system per 7.12.
7.10 Erosion Control
Land proposed as Public Land where there is evidence of active or historic
erosion that may have maintenance or liability implications for the City shall
not be accepted by the City as Public Land.
The Owner shall be responsible for undertaking erosion control and
restoration works on proposed Public Land as necessary for the long-term
prevention and control of erosion.
At the discretion of the Approving Officer, the Owner may be required to
prepare and submit an erosion control plan covering some or all of the
proposed Public Land.
The Owner is responsible for preventing and controlling erosion, and for
restoring sites impacted by erosion, for the term of the Maintenance Period.
7.11 Fire Management
At the discretion of the Approving Officer, the Owner may be required to
prepare and submit a Fuel Management Plan covering some or all of the
proposed Public Land.
The Fuel Management Plan shall be prepared by a Forester and shall
follow industry standards such as the FireSmart Guidelines endorsed by
the BC Ministry of Forests. The Fuel Management Plan shall include but is
not limited to the following aspects:
-
Map(s) showing existing and proposed vegetation, structures, trails,
access points, and firebreaks on Public Lands and vegetated land
adjacent to the site, including an assessment of the fuel hazard in these
areas.
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Page 109 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
Priority zones, per the FireSmart Guidelines, around all existing or
planned structures. Fuel modification prescriptions for these zones shall
be developed based upon proximity to structures and target stand
conditions.
-
Establishment of strategic firebreaks adjacent to structures and
hazardous fuel types, which may also serve as recreational trails.
Breaks shall be a minimum of 1.5 m wide with a 100 mm minimum
gravel base.
-
Deciduous trees shall be retained where possible.
-
Access points shall be provided between lots to provide access to
Public Land containing natural vegetation from the roadway as required
for land maintenance and fire hazard management.
-
Access points shall enable access for emergency and maintenance
vehicles. Hydrants shall be located in the road dedication adjacent to
the access point.
7.12 Irrigation
An irrigation system shall be designed, installed, operated and maintained
to provide sufficient application of water to maintain the plants and grass of
the landscape works and services in a healthy and growing condition for
the irrigation of Public Land to be maintained by the Owner(s). If an
irrigation system is not required at the time of construction, but will be
required in the future, sufficient design, servicing and construction shall be
performed to enable the irrigation system to be readily installed, connected
and operated in future.
Where Public Land is to be maintained by the City, an irrigation system
shall be designed, operated and maintained until the end of the
Maintenance Period. One (1) metered water service and one (1) metered
electrical service (120 volts, 60 amps) shall be provided for each park, open
space, drainage facility, boulevard, median, roundabout, traffic circle and
cul-de-sac island at a location acceptable to the Approving Officer. The
service shall include the establishment of water and electrical service
accounts, testing and certification of the backflow prevention device, a
plumbing permit, an electrical permit, and all materials, labour, fees and
utility costs necessary to provide the service until the end of the
Maintenance Period.
_____________________________________________________________________________________
Page 110 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
SCHEDULE A-8 - QUALITY CONTROL AND ASSURANCE
8.
Quality Control and Assurance
This Schedule sets out the City's minimum standards for quality in design, quality
in construction and quality in record-keeping for the Works and Services to be
designed and constructed in accordance with this bylaw.
Minimum design standards are set out in Schedules A-1 to A-7.
8.1
Engineering Requirements
a)
The Owner shall demonstrate to the satisfaction of the Approving
Officer that the Owner has retained or shall retain the services of a
Consulting Engineer to undertake the design, inspection, testing and
record-keeping for the Works and Services.
b)
The Owner shall complete and provide the Approving Officer with
the following information in the Owner/Consulting Engineering
confirmation letter to demonstrate that the Consulting Engineer is
qualified to undertake the Works and Services and more particularly,
has successfully undertaken projects similar in scope, nature and
value to the Works and Services:
-
The name and address of the Consulting Engineer and a
summary of the projects that the Consulting Engineer has
undertaken that are similar in scope, nature and value to the
Works and Services.
-
The names of the individuals assigned to various aspects of the
project by the Consulting Engineer together with a summary of
the projects that the individual engineers have undertaken that
are similar in scope, nature and value to the Works and Services.
-
The names and the curriculum vitae for the person(s) that the
Consulting Engineer proposes/has retained to undertake the
inspections and testing on its behalf during the construction of
the Works and Services together with a summary of the projects
that the person(s) has completed that are similar in scope, nature
and value to the Works and Services.
-
The names and addresses of all sub-consultants that the
Consulting Engineer has/proposes to retain and a summary of
the projects that the sub-consultants have completed that are
similar in scope, nature and value to the Works and Services.
-
The Owner shall ensure the Consulting Engineer designs all
Works and Services in accordance with this bylaw.
_____________________________________________________________________________________
Page 111 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
-
The Owner shall also confirm that the Consulting Engineer will
provide the Design, Construction and Record-keeping Quality
Control and Assurance Plans described herein. A copy of the
agreement shall be filed with the Approving Officer.
8.2
Construction Requirements
a)
The Owner shall demonstrate that to the satisfaction of the
Approving Officer that the Owner has or shall retain the services of
one or more qualified Contractors to undertake the construction of
the Works and Services. The Owner shall provide the City with the
name and address of its Contractor(s) together with a summary of
the projects that the Contractor(s) has undertaken that are similar in
scope, nature and value to the Works prior to awarding the
contract(s) to the Contractor.
In the case where the Contractor has not performed similar Works
and Services in the City of Nelson, the Approving Officer may
require that the Owner provide a list of projects and references from
other municipalities that demonstrates that the Contractor(s) is
qualified to undertake the Works and Services.
b)
The Owner shall ensure that its Contractor(s) constructs the Works
and Services in accordance with the design, drawings, plans and
specifications approved for construction by the Approving Officer.
8.3
Quality Control and Assurance Plans
a)
Design Quality Control and Assurance Plan
-
The Owner shall submit or cause the Consulting Engineer to
submit a Design Quality Control and Assurance Plan to the City
for approval coincident with submission of the first design
drawings.
-
The Owner's proposed Design Quality Control and Assurance
Plan shall detail the procedures that will be used to ensure and
verify that the design for the Works and Services, including all
plans, drawings and specifications, shall be Completed in
accordance with the minimum design standards set out in this
bylaw.
-
In the case of design items related to pump stations, structures,
structural fills, geotechnical or hydro-geotechnical items or any
item not described in Schedule 1 to 7, the Design Quality Control
and Assurance Plan shall show such specialist and/or sub-
consultants with suitable experience in these works.
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Page 112 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
b)
Construction Quality Control and Assurance Plan
-
The Owner shall submit or cause the Consulting Engineer to
submit a Construction Quality Control and Assurance Plan to the
Approving Officer coincident with submission of the first design
drawing to the City.
-
The Owner's proposed Construction Quality Control and
Assurance Plan must detail the procedures that will be used to
ensure and verify that the Works and Services shall be
constructed in accordance with the Consulting Engineer's design,
plans, drawings and specifications. The Construction Quality
Control and Assurance Plan must include:
−
A proposed Construction Schedule showing milestone dates
and the dates of Substantial and Total Performance of the
Works and Services.
−
The nature and frequency (periodic or full-time resident) of the
proposed site inspections during construction to ensure that
all Works and Services constructed satisfy the intent of the
design and conform with the drawings, plans and
specifications.
−
The nature and frequency of the proposed field and laboratory
testing requirements for the Works and Services including
what materials and equipment are to be tested, what types of
tests will be performed and when these tests are to take
place.
−
Such information as the Approving Officer may stipulate from
time to time.
c)
Record-keeping Quality Control and Assurance Plan
-
The Owner shall submit or cause its Consulting Engineer to
submit a Recordkeeping Quality Control and Assurance Plan to
the Approving Officer coincident with submission of the first
Design Drawings.
-
The Owner's proposed Record-keeping Quality Control and
Assurance Plan shall detail the procedures that will be used to
ensure and verify that proper records will be kept and maintained
throughout the design, construction and warranty phases of the
Works and Services. The Record-keeping Quality and Assurance
Control Plan shall ensure that the following records are kept as a
minimum:
_____________________________________________________________________________________
Page 113 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
−
Quality Manual and Standards.
−
Details of any field design or construction changes to the
drawings, plans and specifications to which changes are
approved in writing by the City.
−
Deficiency Identification Forms (Items of the Works that are
either not supplied or constructed in accordance with the
design (drawings, plans and specifications) or that require
remedial or corrective action).
−
Deficiency Disposition/Verification Forms (List of the
foregoing Items of the Works that have been corrected).
−
Inspection and Test Records.
−
Field measurement records of completed Works and Services
that have been used by the Consulting Engineer to accurately
prepare reproducible as-built drawings that are filed with the
City.
-
Notwithstanding the generality of the foregoing, the Owner shall
ensure that its Consulting Engineer provides the City with the
following at the times and in the manner set out below:
−
Certification prior to paving that it has inspected those items
of the Works and Services that are below areas to be paved
such as roads, walkways, driveways and parking lots, and
that same comply with the design (drawings, plans and
specifications). Such certification shall be accompanied by all
test and inspection reports and by video tapes and reports on
pipe lines.
−
Certification prior to acceptance by the City that surface works
including paving, drainage, curbs and gutters, sidewalks,
street lights, etc. have been constructed in accordance with
the design (drawings, plans and specifications).
_____________________________________________________________________________________
Page 114 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
SCHEDULE A-9 - SUPPLEMENTAL SPECIFICATIONS
This schedule contains supplemental specifications to be applied in conjunction with the
Specifications of the Master Municipal Construction Document, dated April 2000, both of
which shall apply to all Works and Services constructed within the City of Nelson.
Supplemental Specifications contained within this Schedule supplement or supersede the
Master Municipal Construction Document (MMCD). Where the City of Nelson Supplemental
Specifications are in conflict with the MMCD, the City of Nelson Supplemental Specifications
shall take precedence.
Section number and clause numbers in the City of Nelson Supplemental Specifications
coincide with the MMCD numbering protocol.
S02666 Waterworks
3.23
Connection to Existing Mains
.1
Delete and replace with "Make connections to existing water system unless
specified otherwise by the Approving Officer. Notify the Approving Officer a
minimum 48 hours in advance of scheduled connection."
S02731 Sanitary Sewers
3.6
Pipe Installation
.6
Pipes on curved alignments:
.1
Delete "and ribbed profile PVC plastic pipe".
3.8
Connection to Existing Mainline Pipes
.4
Delete
3.12
Leakage Testing - General
.1
Delete "Specified tests may include one or more of the following" and replace
with "Specified test must include at a minimum, either test .1 - Water
exfiltration test, or test .2 - Low pressure air test. Additional tests may be
required as directed by the Approving Officer".
S02734 - Video Inspection
1.0
GENERAL
.1
This Supplemental Specification shall apply to those provisions of the Work
that are unique to the video inspection of gravity sanitary and storm sewer
mains.
_____________________________________________________________________________________
Page 115 of 144 pages
City of Nelson Subdivision and Development Servicing Bylaw 3170, 2011
1.1
Related Works
.1
Storm Sewer
Section 02721
.2
Sanitary Sewer
Section 02731
1.2
Reports
.1
An inspection work report, in log form, shall be maintained during the
inspection. The log shall show the exact location of each leak or fault
discovered by the inspection (e.g. open joints, broken, cracked or collapsed
pipe, presence of grease, roots, debris accumulation, obstructions, infiltration,
water depth variations, and other observations of significance). The reference
location shall include the distance away from the reference manhole and also
the position of the leak or fault as referenced to the crown of the pipe using
clock face notation.
.2
The report shall include the location of all service connections together with a
statement of opinion as to whether or not the service connections are leaking.
Protrusions of the service connections into the mainline shall be noted with
reference to the degree of protrusion.
.3
Photographs shall be taken of all sewer defects. The photographs shall be co-
ordinated with the written report by reference numbers. A minimum of one
photograph per line shall be taken to show a representative view of the
workmanship, as well as additional photographs of deficiencies as required.
.4
Each manhole section of pipe shall be located on the report form in such a
way as to be readily identifiable. Identify such items as name of subdivision,
street names, manhole numbers, type of pie, joint length, direction of flows,
pipe diameter, manhole depth, inspection date, names of the inspection
technician, persons viewing, and videotape identification numbers. Manhole
numbers are to match the numbers shown on the latest issue of the
construction drawings.
.5
Two copies of a final typewritten report with corresponding photographs and
two copies of a DVD shall be furnished to the City at least one week prior to
asphalt or concrete placement over the sewer line. This report shall contain
no less than one photograph per manhole section inspected, and additional
photographs as required to show the line faults and representative line
conditions.
.6
The DVD shall conform to the following:
a) Disc shall be read only.
b) Disc shall be labelled and cross referenced to the inspection report.
c) Video shall be set up with menus per pipe sections.
d) Video shall be formatted for replay on a standalone DVD player.
e) Video shall be in full colour.
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f) The date and running distance (in meters to an accuracy of two decimal
places) shall be displayed continuously on the video.
g) Video shall have direct voice communication at the start of each section
identifying test section, manhole numbers, location, and any other
information required to describe section being videoed.
h) Video shall have direct voice communication at all service locations,
defects, ponding and deleterious materials. Communication shall be
factual information only (i.e. type and defect, depth of ponding, length of
ponding, and type of obstruction).
2.0
PRODUCTS
2.1
Closed Circuit Television Inspection Equipment
.1
Television equipment shall consist of a self-contained camera and a
monitoring unit connected by a coaxial cable. This equipment shall be
specifically designed and constructed for such inspection purposes. The
camera shall be mounted on adjustable skids to facilitate the inspection of
different sizes of pipe. The camera and skids shall be small enough to ensure
passage through a 150 mm diameter sewer. The camera shall be waterproof
and shall have a remotely controlled adjustable self-contained light system
capable of producing at least 100 foot candles of light. The lighting system
shall be capable of lighting the entire periphery of the pipe.
.2
Picture quality shall be such to produce a continuous 500 line resolution
picture showing the entire periphery of the pipe.
.3
Measurement of defects shall be made by devices having a proven accuracy
of ±1%. Cable markings, if used, shall not be spaced at a distance of more
than 500 mm along the length of the cable. All measurement systems and
date must be displayed on the video and pictures in the upper right hand
corner.
.4
Equipment shall be mounted in an appropriate type vehicle. Ample sound
dampening shall be applied to the vehicle and equipment.
2.2
Still Photograph Equipment
.1
To ensure photograph quality, 35mm still photographic cameras shall be
used. Polaroid or similar cameras that do not produce negatives for rapid re-
production will not be accepted. All still photographs shall be in colour.
3.0
EXECUTION
3.1
Cleaning
.1
Prior to inspection, all lines shall be cleaned thoroughly to remove dirt,
grease, sand and other foreign and objectionable debris from inside the pipe
and manholes in order that cracks and other faults are visible.
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3.2
Threading of Sewers
.1
A small diameter poly rope or similar line shall be installed in the sewer in
advance of the inspection in order that the camera traction cable may be
drawn through the sewer. This line shall be installed on a manhole to manhole
basis with the line being tied off at each individual manhole to facilitate the
quick removal of any portion of this line should the need arise due to mainline
sewer blockages or other emergency situations.
2
If, during the inspection procedures, the television camera will not pass
through the entire manhole section, re-set equipment in a manner so that the
inspection can be performed from the opposite manhole.
3.3
Traffic Control
.1
Interference to the normal flow of traffic shall be kept to a minimum. The
equipment shall be arranged so that one lane of traffic is maintained at all
times. Traffic is to be controlled in accordance with the "Traffic Control
Manual for Work on Roadways" published by the Ministry of Transportation &
Highways.
3.4
Flow Control
.1
Where sewer flows are above the normal minimum requirements (generally
not more than half the pipe diameter) to effectively conduct the inspection,
one or more of the following methods of flow control shall be used:
.2
Plugging and Blocking
A sewer line plug shall be inserted into the line at a manhole upstream of the
section to be inspected. The plug shall be designed such that all or a portion
of the sewage flows can be released. During the inspection, flows shall be
shut off or substantially reduced in order to properly inspect the pipe. After the
inspection is complete, the flows shall be returned to normal.
.3
By-Passing or Pumping
When adequate flow control cannot be obtained by the plugging method,
pumps or siphons shall be used to divert all or a portion of the sewage flows
necessary to perform the inspection. Excess sewage flows shall be
transported through a closed pipeline or by tank truck to the nearest or most
economical approved disposal site.
3.5
Rate of Progress
.1
Camera time or rate of speed shall not exceed 6 m per minute to allow
adequate time for operator interpretation. A uniform rate of speed shall be
maintained.
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3.6
Flat or Reverse Grades
.1
All new mains with grades of 1.00% or less shall have a trickle of water
flowing through the main at a rate not to exceed 0.25 L/s. This flow shall be
visible in the video inspection and still photographs, while the inspections are
being completed in order to detect any ponding resulting from flat or reverse
grades.
3.7
Direction of Progress
.1
The camera shall proceed up the main, opposite to the direction of flow.
3.8
Verbal Commentary
.1
The camera shall stop at each leak, fault, service connection and any other
location of significance. A verbal commentary as to the nature and location of
the problem shall be provided.
3.8
Repairs
.1
New video inspections shall be completed following the repair of sewer
system deficiencies.
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THE CORPORATION OF THE CITY OF NELSON
BYLAW NO. 3170, 2011
SCHEDULE A-10 - STANDARD DRAWINGS
This schedule contains the following Standard Drawings:
S1 - Manholes
S2 - Standard Manhole Connection Details
S3 - Manhole Connection Details - Drop and Ramp Type
S11 - Catch basin
S14 - Storm Sewer Outlet With Safety Grillage
S16 - Manhole Requirements For Services
W2a - Water Service Connection - Service Box
W2b - Water Service Connection - Valve Box
W4 - Fire Hydrant Installation
W6/W7 - Air Valve Assembly
C2 - Concrete Sidewalk and Barrier Curb
C3 - Concrete Sidewalk and Rollover Curb
C7 - Driveway Crossing for Barrier Curbs
C9 - Wheelchair Ramp for Sidewalk and Barrier Curb
C14 - Handrail
C15 - Reinforced Concrete Stairs
R2 - Local Road
R3 - Collector Road
R4 - Arterial Road
R5 - Lanes
R6 - Paved Multi-Use Pathway
R7 - Rural Local Cul-De-Sac
R8 - Urban Local Cul-De-Sac
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Schedule B
(Amended by Bylaw No. 3313, 2015)