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THE CORPORATION OF THE MUNICIPALITY OF THAMES CENTRE
BY-LAW NO. 91-2021
A By-law to provide for the administration and enforcement of the
Building Code Act, 1992, and swimming pool permits, and
inspections within the Municipality of Thames Centre
BUILDING BY-LAW
WHEREAS Section 7 of the Building Code Act, S.O. 1992, c.23, as amended,
empowers council to pass By-laws respecting permits for construction, demolition,
occupancy, change of use, sewage systems and conditional permits and respecting
inspections and the charging of permit fees and other related matters;
AND WHEREAS Subsection 7.1(1) of the Building Code Act, S.O. 1992, c.23, as
amended, requires Council to establish and enforce a code of conduct for the Chief
Building Officials and Inspectors;
AND WHEREAS under Subsection 10.(2) of the Municipal Act, 2001, S.O. 2001, c. 25,
as amended, the Municipality of Thames Centre may pass by-laws respecting health,
safety and well-being of persons, protection of persons and property, and structures,
including fences and swimming pools;
NOW THEREFORE the Council of the Corporation of the Municipality of Thames
Centre enacts as follows:
1. SHORT TITLE
1.1. This By-Law may be cited as the Building By-Law
2. INTERPRETATION
2.1. Definitions
Act means the Building Code Act, 1992, S.O. 1992. c. 23, as amended.
Applicant means the owner of a building or property who applies for a permit or
any authorized agent to apply for a permit on the owner's behalf or any person
or corporation empowered by statute to cause the construction or demolition of a
building or buildings and anyone acting under the authority of that person or
corporation.
Architect means the holder of a license. Certificate of practice or temporary
license under the Architect's Act as defined in the Building Code.
Authorized Agent means a person(s) who has been authorized in writing to act
on the owner's behalf for matters relating to an application for a permit.
Building means a building as defined in section 1(1) of the Act
Building Code means regulations made under section 34 of the Act.
Chief Building Official means the Chief Building Official appointed by a By-law of
the Corporation for the purpose of enforcement of the Act
Construct means construct and Construction has a corresponding meaning as
defined in subsection 1(1) of the Act.
Corporation means The Corporation of the Municipality of Thames Centre.
Demolish means demolish and Demolition has a corresponding meaning as
defined in subsection 1(1) of the Act.
Fee By-Law means the current 'Fees and Charges By-Law' for the Corporation.
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By-law 91-2021
Inspector means an inspector appointed pursuant to subsection 3(2) of the Act
and by by-law of the Corporation for the purposes of enforcement of the Act.
Owner means the registered owner of the land or property and includes a
lessee, mortgagee in possession and the person in charge of the property.
Permit means permission or authorization in writing by the Chief Building Official
to perform work, to change the use of a building or part thereof, or to occupy a
building or part thereof, as regulated by the Act and the Building Code.
Permit Holder means the owner to whom the permit has been issued or where
the permit has been transferred, the transferee, and shall be the person who
assumes the primary responsibility for compliance with the Act and the Building
Code.
Professional Engineer or Engineer means a person who holds a license or a
temporary license under the Professional Engineer's Act, as defined in the
Building Code.
Registered Code Agency means a registered code agency as defined in
subsection 1(1) of the Act.
Sewage System means sewage system as defined in subsection 1(1) of the Act.
Municipal Engineer means the Professional Engineer or engineering firm
retained by the Corporation or his/her designate.
Work means the construction or alteration, addition or demolition of a building or
part thereof.
2.2. Additional Definitions
Any words, phrases or terms not defined in this By-Law, that is defined in the Act
or Building Code shall have the meaning ascribed to it in the Act or the Building
Code. Should a word or term not be defined in the Act or the Building Code, it
shall have the meaning that is commonly assigned to it in the context in which it
is used, taking into account the specialized use of terms by the various trades
and professions to which the terminology applies.
3. CLASSES OF PERMITS
Classes of Permits with respect to the Construction, Demolition, Change of Use and
Occupancy of a Building, or part of it, include the following:
3.1. Building Permit
This Permit is required under Subsection 8.(1) of the Act and may include
Plumbing, heating, ventilation and air conditioning systems, Sewage Systems,
Farm Buildings and Designated Structures as set out in Division A, Sentence
1.3.1.1.(1) of the Building Code and signs as set out in Division B, Section 3.15.
of the Building Code.
3.2. Demolition Permit
This Permit is required under Subsection 8.(1) of the Act.
3.3. Conditional Permit
This Permit may be issued by the Chief Building Official in accordance with
Subsection 8.(3) of the Act to authorize any stage of Construction, even though
all of the requirements under Subsection 8.(2) of the Act have not been met.
3.4. Change of Use Permit
This Permit is required under Subsection 10.(1) of the Act when a change in use
of a Building, or part of it, will result in an increase in hazard as determined
under the Building Code even though no Construction is proposed.
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By-law 91-2021
3.5. Occupancy Permit
This Permit is required under Division C, Subsection 1.3.3. of the Building Code
where all or part of a building will be occupied.
3.6. Private Swimming Pool Permit
This Permit is required to govern the installation/construction of private
swimming pools, to ensure compliance with all By-Laws of the Municipality.
Every person who intends to have a Pool or Hot Tub, and, if applicable, a Fence,
installed, whether as an original or a replacement, shall, before such installation,
obtain the applicable permit from the Corporation.
4. ADMINISTRATIVE PROCEDURES RELATING TO PERMITS
4.1. Revisions to Permits
Where a permit holder has made substantial changes to or has deviated from
the plans, specifications, documents or other information filed and in respect of
which a permit has been issued, the permit holder shall notify the Chief Building
Official by filing the following:
i.
the prescribed application form entitled Application for a Permit to
Construct or Demolish;
ii.
revised plans, specifications, documents and other information
sufficient to enable the Chief Building Official to determine whether
or not the revised construction, demolition, or change of use will
conform to the Act, the Building Code and any other applicable law;
and
iii.
the required fee(s) as contained in the Corporations current Fee
By-Law
4.1.1. No person shall make a substantial change or cause a substantial change
to be made to a plan, specification, document or other information on the
basis of which a permit was issued without first obtaining the written
authorization of the Chief Building Official.
4.1.2. The Chief Building Official, in his/her sole discretion, shall determine if
there have been substantial changes to or the permit holder has deviated
from the plans, specifications, documents or other information filed and in
respect of which a permit has been issued.
4.2. Revocation of Permits
The Chief Building Official, subject to provisions outlined in Subsection 8.(10) of
the Act, has the authority to revoke a Permit issued under the Act.
4.3. Transfer of Permit Applications and Permits
Where the ownership of land changes after a Permit application has been
submitted and fees paid, or where a Permit has been issued, the Applicant for
the Permit, the person to whom the Permit was issued or the new owner of the
land, as the case may be, may submit a request to the Chief Building Official
requesting a transfer of the Permit application and fees or the Permit as
identified in Clause 7.(1)(h) of the Act by submitting the following information:
i.
the name and address of the person to whom the Permit
application and fees or the Permit are to be transferred;
ii.
the name and address of any contractors that have changed from
those listed on the Permit application or the Permit;
iii.
the name and address of Architect(s) and Professional Engineer(s)
responsible for the design and field review of the Construction that
have changed from those listed on the Permit application or the
Permit;
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By-law 91-2021
iv.
the name and address of the person who paid the Permit fees; and
v.
where the transfer is being initiated on the initiative of the
transferor, proof to the satisfaction of the Chief Building Official that
the transferee has been provided with advance notice of same.
5. REQUIREMENTS FOR APPLICATIONS
Every application for a permit shall be submitted to the Chief Building Official and
shall contain the following information:
5.1. Building, Demolition, Conditional, and Change of Use Permits
Where an application is made for a Building or Demolition Permit under
Subsection 8.(1) of the Act, a Conditional Permit under Subsection 8.(3) of the
Act, or a Change of Use Permit under Subsection 10.(1) of the Act, the
application shall comply with Division C, Sentence 1.3.1.3.(5) of the Building
Code and be complete with documents and other information as required in this
by-law.
5.2. Sewage System Permits
Where an application is made for a sewage system Building Permit under
Subsection 8.(1) of the Act, the application shall comply with Division C,
Sentence 1.3.1.3.(5) of the Building Code and be complete with documents and
as follows:
i.
Contain a site evaluation, and sewage design flows, as described
with in the Building Code;
ii.
Sewage system design prepared by an engineer; or other approved
qualified design, to the acceptance of the Chief Building Official;
and
iii.
Any other information as required by this By-Law.
5.3. Private Swimming Pools
Where an application is made under this By-Law for the installation of a private
swimming pool, the application shall comply with this By-Law, the current
Fencing By-Law, and be complete with information as required by this By-Law
and the following information:
i.
A certified site grading plan by an engineer or Ontario Land
Surveyor, showing existing elevations and new elevations,
conforming to, current grading plans for the subdivision, and
showing no negative impacts on neighbouring properties.
5.4. Prescribing Forms
The forms required for an application for a Permit, unless otherwise specified by
the Chief Building Official, shall be those forms as set out in Schedule "A" of this
by-law.
5.5. Plans and Specifications
5.5.1. Sufficient information shall be submitted with each application for a Permit
to enable the Chief Building Official to determine whether or not the
proposed Construction, Demolition or Change of Use will conform with the
Act, the Building Code and any other applicable law.
5.5.2. Each application shall, in order to be deemed complete, and unless
otherwise specified by the Chief Building Official, be accompanied by two
complete sets of working drawings and information as set out in Schedule
"B" of this by-law, or electronic drawings may be submitted, or may be
required to be submitted, at the discretion of the Chief Building Official.
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By-law 91-2021
5.5.3. Plans shall be drawn to scale (min. 1:75 or 3/16"=1'-0") on paper,
electronic media approved by the Chief Building Official, or other durable
material approved by the Chief Building Official, and shall be legible. Free
hand drawings are not permitted to be submitted.
5.5.4. A Plan of Survey certified by a licensed Ontario Land Surveyor shall be
submitted to the Chief Building Official when required to demonstrate
compliance with the Act, Building Code or any applicable law.
5.5.5. Any site plans submitted to the Chief Building Official shall demonstrate
compliance with the Act, the Building Code or any applicable law and shall
contain the following information:
i.
Lot size and the dimensions of property lines and setbacks to any
existing or proposed buildings;
ii.
Existing and finished ground levels or grades;
iii.
On-Site Sewage Systems and private wells, for the property and
neighbouring properties, as required;
iv.
Natural features including water courses, streams and topographic
features, and setbacks from each;
v.
Public utilities location(s) and existing streets and street names;
vi.
Existing rights-of-way, easements and municipal services, including
municipal drains;
vii.
Proposed fire access routes, and existing fire hydrant locations, if
applicable. And any information or documentation required to
determine compliance with fire access requirements of the Building
Code and water supply requirements for fire suppression;
viii.
Scale bar; and
ix.
North marker indicated.
5.6. Alternative Solutions
Where a person proposes the use of an Alternative Solution as defined in
Division A, Article 1.4.1.2. of the Building Code, the proposal shall:
i.
Include all documentation requirements as set out in Division C,
Subsection 2.1.1. of the Building Code, and
ii.
Be submitted on the application form as set out in Schedule "B" of
this by-law.
5.7. Inactive or Abandoned Permit Applications
5.7.1. Where an application for a Permit remains inactive for six months after it is
submitted, the application may be deemed by the Chief Building Official to
have been abandoned and notice thereof shall be given to the Applicant.
Once an application is deemed to be abandoned, it may be cancelled and
a new application will be required for the proposed work.
5.7.2. Where an application is deemed abandoned, all submitted plans,
specifications and documents shall be disposed of, or upon the written
request of the applicant, returned to the applicant.
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By-law 91-2021
5.8. Incomplete Application
5.8.1. Where the Chief Building Official determines that an application is
incomplete, the Chief Building Official may refuse to accept the application
or may commence to process the application if the applicant acknowledges
in writing that the application is incomplete.
5.8.2. Where an applicant acknowledges that the application is incomplete, the
Chief Building Official shall not be bound by the timelines prescribed bythe
Building Code within which a permit must be issued or refused, until such
time as the application is deemed to be complete.
6. AS CONSTRUCTED PLANS
6.1. The Chief Building Official may require that a set of As Constructed Plans of a
Building be filed with the Chief Building Official on completion of Construction
under such conditions as may be prescribed in the Building Code or the Act.
6.2. Upon completion of Construction of the foundation for single detached dwellings,
semi-detached dwellings, duplexes or townhouses, a certificate from an Ontario
Land Surveyor, Professional Engineer or Architect shall be submitted to the
Chief Building Official confirming that the elevation of the foundation conforms to
the Ontario Building Code and to the subdivision grading plan or lot grading plan
approved by the Corporation.
6.3. Upon completion of Construction of the foundation for single detached dwellings,
semi-detached dwellings, duplexes or townhouses, a survey from an Ontario
Land Surveyor shall be submitted to the Chief Building Official confirming that
the location of the building conforms to the current Zoning By-law.
7. PLANS PROPERTY OF THE CORPORATION
Plans and specifications submitted in accordance with the requirements of this
Bylaw or otherwise required by the Act become the property of the Corporation and
shall be retained or disposed of in accordance with the relevant legislation and the
corporations By-Laws.
8. FEES
8.1. Fees Payable
Fees for a required permit, alternative solution, change of use, conditional
permit, plan reexamination, or other administrative charge, shall be set out in the
Corporations current Fee By-Law, and shall be calculated by the Chief Building
Official for the work proposed.
8.2. Floor Area
8.2.1. Where fees are calculated based on floor area for a finished building, such
as a dwelling or other finished space, floor area shall mean the total
finished floor space of all stories subject to the application.
8.2.2. Where fees are calculated based on floor area for an unfinished building,
such as garages or sheds, floor area shall mean the total gross floor area
of the building.
8.3. Additional Fees
Any person who commences construction, demolition or changes the use of a
building or part thereof prior to the issuance of a permit to construct, demolish or
change the use of a building or part thereof shall, in addition to any other penalty
imposed under the Act or Building Code, pay a nonrefundable Construction
without a Permit Fee, as follows:
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By-law 91-2021
Work Commenced/Completed Prior to Permit
Applicable Increase
in Permit Fee
i.
Footings/Foundations commenced
25%
ii.
Structural Framing commenced
50%
iii.
Structural Framing completed
75%
iv.
Building is completed
100%
v.
Any other work requiring a permit:
a.
if 25% of the scope of work is completed
25%
b.
if 50% of the scope of work is completed
50%
c.
if 75% of the scope of work is completed
75%
d.
if 100% of the scope of work is completed
100%
vi.
Demolition or partial demolition has commenced
100%
8.4. Additional Inspection Fee
In addition to the fees paid at the time of application, an additional inspection fee
shall be payable prior to each inspection being undertaken of any building in the
amount as set out in the Corporations Fee By-Law where, more than two
inspections, for one stage of construction, are required due to construction being
incomplete or not in compliance.
8.5. Permit Refunds
In the case of withdrawal or abandonment of an application for a Permit or
abandonment of all or a portion of the work or the non-commencement of any
project, the Chief Building Official shall, upon written request of the Owner or
Applicant, determine the amount of paid Permit fees that may be refunded to the
Owner or Applicant, if any, as follows:
i.
80 percent (80%) if administrative functions only have been
performed;
ii.
70 percent (70%) if administrative and zoning functions only have
been performed;
iii.
50 percent (50%) if administrative, zoning and plans examination
functions have been performed;
iv.
35 percent (35%) if the Permit has been issued and no field
inspections have been performed subsequent to Permit issuance;
v.
5 percent (5%) shall additionally be deducted for each field
inspection that has been performed after the Permit has been
issued;
vi.
A refund will not be made on a Permit where the amount paid was
less than $200.00; and
vii.
No refund shall be made after two years following the date of Permit
application where the Permit has not been issued or one year
following the date of Permit issuance.
8.6. Annual Fee Adjustment
8.6.1. Council may adjust the building permit fees for any or all classes of permits
in the Corporations current Fee By-Law once annually in accordance with
the "Consumer Price Index as published by Statistics Canada. Such
adjustment to the fees shall not require an amendment to this By-Law nor
require a public meeting.
8.6.2. Council may adjust the building permit fees for any or all classes of permits
in the Corporations current Fee By-Law, in the first two years of this By-
Law as a phase in approach, to maintain cost recovery for staffing and as
per the Corporations current fee analysis study. Such adjustment to the
fees shall not require an amendment to this By-Law nor require a public
meeting.
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By-law 91-2021
9. NOTICE REQUIREMENTS FOR INSPECTIONS
9.1. Prescribed Notices
The Applicant or an authorized agent shall notify the Chief Building Official, of
the prescribed notices under Division C, Article 1.3.5.1. of the Building Code and
every additional notice under Division C, Article 1.3.5.2. of the Building Code, at
least one business day prior to each stage of Construction.
9.2. Notice Prior to Occupancy
The Applicant or an authorized agent shall notify the Chief Building Official,
requesting an occupancy permit be issued, for certain buildings of residential
occupancy in accordance with Article 1.3.3.4 of Division C of the Building Code.
9.3. Notice Deemed Effective
Notice pursuant to this By-law is not effective until the notice is actually received
by the Chief Building Official or his/her designate by voice mail, by email or other
means of electronic transfer deemed acceptable by the Corporation, or where
the notice is given in person or orally, or in writing and is acknowledged by the
Chief Building Official or his/her designate. Where notice is received by voice
mail, by email or electronic transfer, the notice shall be deemed to be effective if
received on a business day or on the first business day following a weekend or
statutory holiday.
9.4. Time Period for Conducting Inspections
Upon receipt of proper notice, the Chief Building Official or an inspector shall
undertake a site inspection of the building to which the notice relates in
accordance with the prescribed time periods set out in Section 11 of the Act and
Article 1.3.5.3 of Division C of the Building Code.
10. FENCING
10.1. Fencing of Construction and Demolition Sites
Construction fencing shall be provided around a demolition or construction site
that presents a hazard to the public.
10.2. Fencing Requirements
Construction fencing shall comply with the Corporations current fence By-Law
and:
i.
Create a continuous barrier to deter unauthorized entry;
ii.
Have a height of not less than 1.2 meters above grade;
iii.
Be maintained in a vertical plane in good repair; and
iv.
Have all openings closed when the site is unattended.
11. CODE OF CONDUCT
11.1. The Code of Conduct for the Chief Building Official and Inspectors, required
under Subsection 7.1(1) of the Act, is set out in the Corporations current policy
manual, and posted for the public on the Corporations website.
12. OFFENCES AND PENALTIES
Every person who contravenes any provision of this By-law is guilty of an offence
and on conviction is liable to a fine as provided in section 36 of the Building Code
Act, 1992, S.O. 1992, c.23, as amended.
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By-law 91-2021
13. SERVERABILITY
Where a court of competent jurisdiction declares any section or part of a section of
this by-law to be invalid, or to be of no force and effect, it is the intention of the
Corporation in enacting this by-law that the remainder of this bylaw shall continue in
force and be applied and enforced in accordance with its terms to the fullest extent
possible according to law.
14. EFFECTIVE DATE
This By-Law comes into force on the January 1, 2022.
15. REPEAL
By-Law No. 22-2015, as amended, of the Corporation of the Municipality of Thames
Centre is hereby repealed at the effective date of this By-Law.
READ a FIRST and SECOND time this 13th day of December, 2021.
READ a THIRD time and FINALLY PASSED this 13th day of December, 2021.
______________________
Mayor, A. Warwick
______________________
Clerk, T. Michiels
Schedule A
By-Law 91-2021
Prescribed Forms
Pursuant to Section 5.4 of this By-Law, the following forms shall be those used for
the administration and enforcement of the Act, Building Code and this By-Law:
1- Application for a Permit to Construct or Demolish
2- Schedule 1: Designer Information
3- Schedule 2: Sewage System Installer Information
4- Energy Efficiency Design Summary: Prescriptive Method
5- Energy Efficiency Design Summary: Performance & Other Acceptable
Compliance Methods
6- SB-10 Energy efficiency design summary
7- Commitment to General Reviews by Architects and Engineers
8- Schedule C - Design Calculations for Class 2, 4, & 5, ON-SITE Sewage Systems
9- Prescribed Orders
a. Order to Comply
b. Order Not to Cover or Enclose
c. Order Requiring Tests and Samples
d. Stop Work Order
e. Order to Uncover
10- Application for Alternative Solution
Schedule B
By-Law 91-2021
Required Plans and Specifications
Pursuant to Subsection 5.5.2 of this By-Law, the following forms may be required to
accompany applications for Permits according to the scope of work;
1-
Site plan / Survey
2-
Lot grading plan
3-
Floor plan
4-
Foundation plan
5-
Roof framing plan / roof truss layout plan
6-
Detail roof truss plans
7-
Reflected ceiling plan
8-
Cross section plan / detail plan / section plan
9-
Air barrier detail plan
10- Building elevations
11- Structural drawings
12- Architectural drawings
13- HVAC drawings
14- Electrical drawings
15- Mechanical drawings
16- Plumbing drawings
17- Fire alarm drawings
18- Sprinkler drawings
19- Travel distance / exit plans
20- Window and door schedules and details
21- Ontario building code matrix
22- Fire separation plans / fire separation specifications / fire separation details
23- On-Site sewage system design layout and specifications
The Chief Building Official may specify that not all the above mentioned plans are
required to accompany an application for permit.
This information is in addition to any information specified in this By-Law.
Schedule C
By-Law 91-2021
Design Calculations For Class 2, 4, & 5 ON-SITE Sewage Systems
SCHEDULE C
Design Calculations For Class 2, 4, & 5 ON-SITE Sewage Systems.
Owner/Address:
Designer:
Installer:
BCIN #:
BCIN #:
STEP 1 - DAILY SEWAGE FLOW (Based on Hydraulic Loads for Fixtures, Floor Area, and Bedrooms)
Plumbing Fixture
Description
Existing #
of Fixtures
Proposed #
of Fixtures
Hydraulic
Load
Fixture
Units
All calculations as per Part
8 of Ontario Building Code
Bathroom group
(toilet, sink, bathtub)
6
Toilet
4
Proposed(m2):
Washbasin
1.5
Proposed(ft2):
Bathtub or Shower
1.5
Existing(m2):
Kitchen Sink(s)
1.5
Existing(ft2):
Bar Sink
1.5
Total Finished Floor Area
Excluding Area of
Finished Basement:
Dishwasher
1.5
Washing Machine
1.5
Bidet
1
m2:
Laundry Tub
1.5
ft2:
Other:
TOTAL FIXTURE UNITS
Residential Occupancy
Number of bedrooms
1
2
3
4
5
Q (L/day)
750
1100
1600
2000
2500
If you have more than 5 bedrooms, put 5 in the existing number of bedrooms and add additional bedrooms under
additional flow for each bedroom over 5
Existing Number of Bedrooms
Additional Bedrooms
Hydraulic Load, Q (L)
Calculation
Additional Flow For:
Existing
Proposed
Q (L/day)
Calculation
Each Bedroom over 5 OR*
500
Floor space for each 10m2 over 200m2 up to 400m2
100
Floor space for each 10m2 over 400m2 up to 600m2
75
Floor Space for each 10m2 over 600m2 OR*
50
Each fixture unit over 20 fixture units total
50
TOTAL (L) =
*NOTE: where you need to do multiple calculations, signified by the "OR" in the table, do the calculation for daily sewage
flow based on bedrooms and floor space first, then fixture units, and use the larger of the two calculations.
Other Occupancy (Table 8.2.1.3 (B))
Establishment: (office, store, etc.)
Volume/Unit :
Occupant Load :
Volume (L) :
EXPECTED DAILY DESIGN SEWAGE FLOW(Q):
1 of 4
STEP 2 - PROPERTY SOIL PROFILE AND PERCOLATION RATE (T) DESCRIPTION
Percolation rate (T) is measured as minutes/centimetre, and measures the rate at which water
drains into the soil. Please indicate the T-time of your site below as calculated by a qualified
person.
Soil Type
(1) Coarse
Gravel, no
fines
(2) Gravel,
some small
rocks
(3) Gravel,
sand mix,
some fines
(4) Sand,
fairly
uniform,
some fines
(5) Sandy,
Loam mix
(6) Silty,
Loam,
almost clay
(7) Clay,
smears well,
rolls into
ribbon
T-time
(min/cm)
0 to 1
1 to 5
5 to 10
10 to 15
15 to 25
25 to 50
> 50
ON_SITE PROFILE (SUBTRACT USEABLE DEPTH OF SOIL FROM 1.5m FOR DEPTH OF IMPORTED FILL)
Select largest percolation rate (T) for appropriate soil type and insert below
Soil Depth
(m)
Percolation
Rate T
Soil Type
Fill in the following:
0.2
0.4
Depth of Soil /
Impervious Soil /
Groundwater Table(m):
0.6
0.8
1.0
1.2
1.4
1.6
Fill in the following information on your soil
Depth (m)
Depth (ft)
Rate (min/cm)
Topsoil to be removed:
Usable Existing Soil:
Imported Fill:
Percolation Rate (T):
Excavation of existing soil:
CONTACT AREA CALCULATION
If you do not have a minimum of 250mm of useable soil on the property, you will need to import the mantle or contact area.
Choose T and, divide Q by Loading Rate for T
Percolation Time (T) of soil (min/cm) Loading Rate (L/m2/day)
1 < T ≤ 20
10
20 < T ≤ 35
8
35 < T ≤ 50
6
T > 50
4
DAILY SEWAGE FLOW
(Q):
÷
Loading Rate (L/m2/day)
=
CONTACT AREA (m2)
÷
=
2 of 4
STEP 3 - A) SEPTIC TANK SIZE CALCULATION
To calculate the minimum capacity of your septic tank, use the following formulas. Minimum tank
size is 3600L.
Residential:
Q=
2XQ=
Tank Size:
Other Occupants:
Q=
3XQ=
Tank Size:
B) LEACHING BED LENGTH CALCULATION (conventional)
Length (m)= (Q X T)/200
Length of Pipe (ft )=
Number of Runs (m):
D-BOX (Y/N):
Header (Y/N):
C) FILTER BED - Where you may not have sufficient area on your property to install a leaching bed, you
may install a filter bed for your distribution system
FILTER BED CALCULATION - If your daily sewage flow is less than 3000L/day, perform calculation 1), or
if your daily sewage flow exceeds 3000L/day, perform calculation 2).
Calculation 1) - Filter Bed Surface Area
Surface Area (m2) = Q ÷ 75
Q =
FILTER BED SURFACE AREA (m2)
=
SA =
FILTER BED SURFACE AREA (ft2)
=
Calculation 2) - Filter Bed Surface Area
Surface Area (m2) = Q ÷ 50
Q =
FILTER BED SURFACE AREA (m2)
=
SA =
FILTER BED SURFACE AREA (ft2)
=
Select a desired length for the filter bed
Filter Bed Loading
Area (m2):
Length (m):
Width (m):
Filter Bed Loading
Area (ft2):
Length (ft):
Width (ft):
EXTENDED CONTACT AREA - T>11.5
Contact Area = (QXT)/850
EXTENDED CONTACT AREA (m2)
=
Q =
EXTENDED CONTACT AREA (ft2)
=
T=
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DESIGN CALCULATIONS FOR A CLASS 2 SEWAGE SYSTEM
Refer to Sizing a Grey Water System located at the end of the description for a Class 2 - Leaching Pit
system located on the APH website at www.algomapublichealth.com
D) GREYWATER SYSTEM -CLASS 2
1) How much Grey Water Waste?
Do you have pressurized(P) or non-
pressurized(N) water? (P/N)
Type of System
Number of
Fixture Units
Volume/Unit
(L)
Grey Water Waste, Q (L)
IF Grey Water Waste(Q) is greater than 1000L, a grey water system cannot be used.
2) Loading Rate (LR)
Loading Rate = 400/T
T =
LOADING RATE (L/m2/day)
=
Loading Rate =
3) Size of System
Size of System = Q / LR
Q =
SIZE OF SYSTEM (m2)
=
LR =
DESIGN CALCULATIONS FOR A CLASS 5 SEWAGE SYSTEM
E) Holding Tank - Class 5
In order to calculated the capacity of your proposed holding tank, you must perform the following two
calculations, and install a holding tank(s) with a capacity of the greater volume
Minimum Holding Tank Capacity (L) =
9000
Seven(7) X Daily Sewage Flow, Q (L) =
MINIMUM HOLDING TANK CAPACITY
(L)=
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