Bylaw 1261-17: Lavoy ASP
County of Minburn No. 27, Alberta
· adopted 2017-01-01
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BYLAW #
AREA STRUCTURE PLAN
HAMLET OF LAVOY
County of Minburn No. 27
1261-17
Adopted April 16, 2018
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
i
Table of Contents
1.0 Introduction ............................................................................................................................................ 1
1.1 Location ............................................................................................................................................... 1
1.2 Plan Purpose ....................................................................................................................................... 1
1.2 Plan Objectives .................................................................................................................................... 1
1.3 Municipal Policy/Regulatory Context ................................................................................................. 1
1.4 Provincial Policy/Regulatory Context .................................................................................................. 4
2.0 Plan Area Characteristics ........................................................................................................................ 5
2.1 Population ........................................................................................................................................... 5
2.2 Land Ownership .................................................................................................................................. 5
2.3 Topography & Drainage ...................................................................................................................... 5
2.4 Waterbodies ........................................................................................................................................ 6
2.5 Limiting Distances ............................................................................................................................... 6
3.0 Population Projection & Land Absorption .............................................................................................. 7
3.1 Population Projection ......................................................................................................................... 7
3.2 Land Absorption .................................................................................................................................. 8
4.0 Generalized Future Land Use Concept ................................................................................................. 10
4.1 Overview ........................................................................................................................................... 10
4.2 Residential ......................................................................................................................................... 10
4.2.1 Infill ............................................................................................................................................ 10
4.2.2 Expansion Area ........................................................................................................................... 11
4.3 Direct Control .................................................................................................................................... 11
4.3 Business Industrial ............................................................................................................................ 11
4.5 Municipal Reserve ............................................................................................................................. 11
4.6 Sequence of Development ................................................................................................................ 11
4.7 Highway Design Policies .................................................................................................................... 12
5.0 Servicing & Utilities ............................................................................................................................... 13
5.1 Stormwater ....................................................................................................................................... 13
5.2 Sanitary & Lagoon ............................................................................................................................. 13
5.3 Water ................................................................................................................................................ 13
5.4 Utility Services ................................................................................................................................... 13
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
ii
6.0 Roads & Access ..................................................................................................................................... 14
6.1 Internal Road System and Pedestrian Movement ............................................................................ 14
6.2 Highway 16 Access Management ..................................................................................................... 14
6.3 Traffic Impact Assessment (TIA) ....................................................................................................... 14
7.0 Force & Effect ........................................................................................................................................ 15
Maps
Map 1 - Hamlet of Lavoy ASP Area
Map 2 - Hamlet of Lavoy Land Use Districts
Map 3 - General Site Drainage
Map 4 - Generalized Future Land Use Concept
Map 5 - Possible Layout for Direct Control Residential District
Map 6 - Sanitary
Map 7 - Water Distribution System
Map 8 - Highway Access Management
List of Tables
Table 1. Land Use District Areas
Table 2. Population Statistics
Appendix - not forming part of this Bylaw
Appendix A - Associated Engineering Servicing Studies
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
1
1.0 INTRODUCTION
1.1 Location
The Hamlet of Lavoy is located on the north side of Highway 16 approximately 10 km east of Vegreville
and approximately 5 km west of the intersection of Highway 36 and Highway 16. The northern mainline
of CN Rail runs parallel with Highway 16 along the Hamlet's southwest border. Lavoy is gently sloped
generally draining from the northeast to the southwest (toward the rail line and Highway 16). There is
one main access to Lavoy from Highway 16 which is lighted and sign controlled.
1.2 Plan Purpose
The Hamlet of Lavoy Area Structure Plan (the Lavoy ASP) serves two important functions. The first is to
articulate a vision for the community. The second is to establish sound land use planning policies that
support and implement the direction established. The Lavoy ASP Plan Area is illustrated in Map 1
Hamlet of Lavoy ASP Area.
1.2 Plan Objectives
Over the life-span of this ASP, a period of approximately 25 years, key objectives are:
1. To stabilize, diversify and grow the community, the primary purpose being to keep and attract
people and businesses both in and surrounding Lavoy.
2. To take full advantage of Lavoy's close proximity to the intersection of Highways 16 and 36 as
well as the Town of Vegreville to grow its residential and business industrial base. This will help
to ensure that existing and future community infrastructure (e.g. water treatment/distribution,
sewage collection/treatment, community facilities, former school site, etc.) is utilized and/or
extended in an efficient and economical manner.
3. To ensure an improved standard of development both for existing and future uses to ensure
that adequate amenities are afforded to the existing and future community of Lavoy.
4. To ensure that the use, subdivision and development of land in Lavoy is governed by sound
planning so that all of the above objectives can be fully realized.
1.3 Municipal Policy/Regulatory Context
The Lavoy ASP is consistent with the County's recently updated Municipal Development Plan and Land
Use Bylaw. The proposed vision and future land uses in the Lavoy ASP are consistent with the MDP as
can be seen in the following policies related to Hamlets found in Section 3 of the MDP:
3.3.1
The Developer shall be responsible for all costs associated with the servicing of all new
subdivisions and developments including infill of existing lots (see also MDP Section 3.6
Transportation & Utilities).
3.3.2
In the case of infill lots, notwithstanding Policy 3.3.1, the County may consider covering the
costs associated with providing one water and one sanitary sewer connection from the property
line to any immediately adjacent trunk line existing at the time of the passing of this Bylaw.
3.3.3
The Developer shall bear any costs associated with relocating an existing water and/or sanitary
sewer connection to another location on the same lot.
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51 ST.
49 ST.
50 ST.
CN RAILWAY
50 AVE.
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TWP RD 520
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53 AVE.
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Fill
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ASP Area
Highway
Railway
LEGEND
Hamlet of Lavoy ASP Area
MAP 1
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Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
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3.3.4
The County shall consider developing and adopting an off-site levy bylaw to collect fees from
subdivision and development to assist in the costs of upgrading and/or expanding off-site
infrastructure in accordance with the Municipal Government Act.
3.3.5
The County shall support orderly and economic development in the Hamlets of Lavoy, Ranfurly,
Minburn and any future hamlet(s).
3.3.6
The County shall support the provision or extension of infrastructure including roads, sanitary
sewer systems, water systems or stormwater management systems in any existing or future
hamlet(s) where there is sufficient justification for such infrastructure supported by planning,
engineering and fiscal analysis.
3.3.7
The Developer shall be responsible for the construction of public roads to County standards if
the timing of the proposed development does not correspond to the established road
construction priorities of the County in order to access a proposed development. A non-
negotiable form of security shall be provided by the Developer to ensure that road construction
is to the required standard of the County.
3.3.8
The County shall prepare area structure plans for the Hamlets of Lavoy, Ranfurly, Minburn and
any future hamlet(s) in accordance with the policies of this Plan, and the area structure plans
shall be adhered to by the County when deciding upon land use, subdivision and development
applications.
3.3.9
The County should ensure that hamlet development occurs in general order of 1) in-filling of
vacant lots, 2) rehabilitation, restoration or redevelopment of deteriorating buildings, 3)
relocation and redevelopment of inappropriate uses, 4) expansion into the unsubdivided and
undeveloped areas within the hamlet and, 5) lastly, expansion of the hamlet.
3.3.10 The Hamlets of Lavoy, Ranfurly and Minburn, or any future hamlet(s), shall not expand onto
arable land unless no alternative exists.
3.3.11 The County shall not permit growth that may jeopardize groundwater supplies or quality in
hamlets not serviced by regional water. Further, the Developer shall bear the costs to expand or
improve the water supply to support growth.
3.3.12 The County shall ensure that the Hamlets of Lavoy, Ranfurly and Minburn, and any future
hamlet(s), are planned and designed so that new lots are of a size and configuration and located
such that they maximize the use of existing or proposed municipal services.
3.3.13 The County shall require that new developments, and existing developments that have on-site
servicing needing to be replaced and are in proximity to the servicing available to new
developments, connect and contribute to the support of municipal servicing where municipal
servicing is available to new developments.
3.3.14 The County shall not permit development in hamlets dependent on on-site water supply and/or
sewage treatment in areas with soil limitations for effluent disposal in situations where
municipal servicing is not available.
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
3
3.3.15 The County may not permit development dependent on groundwater in areas of inadequate
groundwater water supply and/or poor quality or require potable water provision through the
use of cisterns in such cases. Where the County accepts water provision through the use of
cisterns, an appropriate notation on each title within the subdivision shall be required alerting
the prospective owner that a cistern will be required in perpetuity to provide the household
with potable water.
3.3.16 The County shall consider commercial and industrial activities in the Hamlets of Lavoy, Ranfurly,
and Minburn, or any future hamlet(s), where the development(s) will serve to provide basic
commercial and industrial services to the residents and the surrounding agricultural area.
3.3.17 The County may require that the owner/developer undertake a conceptual scheme
prepared/compiled by a qualified person (e.g. Registered Professional Planner) prior to any
substantial new development or subdivision in the Hamlets of Lavoy, Ranfurly, and Minburn, or
any future hamlet(s), addressing the following:
a. the logical and orderly sequence of development;
b. proposed land uses;
c. provision of municipal services (water, sewer, roads, and utilities);
d. consideration of soil, topography, drainage, and other physical constraints to
development;
e. location and extent of reserve lots;
f. impact on adjacent land uses; and,
g. any other matters the County considers necessary.
3.3.18 The County shall, in the Hamlet of Ranfurly, consider any dwellings lawfully in existence as of
February 16, 2010, as a "permitted use" for the purposes of the direct control land use
districting applied to the Hamlet of Ranfurly insofar as authorizing minor renovations, additions,
and so forth. In authorizing major renovations and additions to such dwellings, or where such
dwellings are proposed to be rebuilt or replaced with a new dwelling, or in the case of a
proposed subdivision, the County must be satisfied by means it considers necessary (e.g. sewage
treatment system inspection, water well capacity/quality testing, etc.), that the subject dwelling
is or can be serviced with an on-site supply of potable water and that sewage effluent is or can
be properly treated on-site. The foregoing does not allow the development of a new dwelling on
a lot where a dwelling did not lawfully exist at the time this Plan came into effect.
3.3.19 Further to Policy 3.3.18, the County shall encourage the enlargement of existing residential lots
via lot consolidation, reconfiguration, replotting and so forth, for the purposes of providing
increased opportunities to improve on-site servicing wherever and whenever possible.
3.3.20 Further to Policy 3.3.19, and notwithstanding policy 3.3.18, where enlargement of existing
residential lots via consolidation, reconfiguration, replotting and so forth, has taken place,
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
4
and/or where existing lots are large enough to accommodate private servicing, consideration for
granting approval for a new residence may be given if access to private on-site water and
sanitary servicing can be proven, to the written satisfaction of the County.
The lands within the Hamlet, a total of 66.09ha, have been divided into six land use districts in the LUB
as illustrated in Map 2 Hamlet of Lavoy Land Use Districts. Most of the developed land falls within the
HR - Hamlet Residential District. The vast majority of the undeveloped land is zoned HUR - Hamlet
Urban Reserve. The lands within the Lavoy ASP are broken out by land use district as summarized below
in Table 1. Land Use District Areas.
Table 1. Land Use District Areas
LAND USE DISTRICT
AREA (ha)
Hamlet Reserve (HR)
10.39
Hamlet Urban Reserve (HUR)
28.17
Hamlet Business Industrial (HBI)
5.99
Hamlet of Lavoy Direct Control Residential (HLDCR) 4.88
Hamlet of Lavoy Direct Control Transitional
(HLDCT)
0.65
Direct Control (DC)
6.70
Total Area
56.78
Note: Road ROW Area = 9.31ha
1.4 Provincial Policy/Regulatory Context
It is important that this Plan be endorsed by Alberta Transportation pursuant to Section 14 of the
Municipal Government Act Subdivision and Development Regulation to facilitate subsequent subdivision
and development approvals and to ensure consistency with important Provincial policy. Having this
specific area well managed and planned out in relation to Highway 16 will contribute significantly to the
Hamlet attracting investment and developing to its potential.
HUR
HLDCR
HR
HBI
HBI
HLDCT
DC
51 ST.
49 ST.
50 ST.
50 AVE.
TWP RD 520
Lagoon
Site
RGE RD 134
51 AVE.
52 AVE.
53 AVE.
YELLOWHEAD HIGHWAY 16
HAMLET OF LAVOY
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SW4-52-13 W4
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ASP Area
HR -- Hamlet Residential District
HUR -- Hamlet Urban Reserve District
HLDCR -- Hamlet of Lavoy Direct Control Residential District
HLDCT -- Hamlet of Lavoy Direct Conrol Transitional District
DC -- Direct Control District
HBI -- Hamlet Business Industrial
LEGEND
Hamlet of Lavoy Land Use Districts
MAP 2
0
75
150 m
1:7,500
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
5
2.0 PLAN AREA CHARACTERISTICS
2.1 Population
Based on the 2016 Municipal Census, the population of Lavoy was approximately 105. Residents occupy
about 60 private dwellings, 11 of which are modular/mobile homes. These dwellings are, for the most
part, in good condition with well-maintained yards. Based on the 2016 population and number of
occupied private dwellings, average household density is 1.75 persons per dwelling. This number is
significantly lower than the 2016 Federal Census household density data for the County of Minburn as a
whole, which is 2.5 persons per dwelling.
Lavoy is a community that is important to the local rural population having postal service, a well-kept
community hall, seniors centre and municipal water and sanitary sewer services. The County's Public
Works Department operates a storage facility at the former school site.
2.2 Land Ownership
Though the vast majority of the land within the Hamlet is privately owned, the County is also a
landowner. It owns the water reservoir site, the old Public Works site and the community hall property.
It also owns serviced land in Block 8, unserviced land in Block B, as well as a number of unserviced,
vacant lots. The County recently acquired the former school site located at the north end of the Hamlet
and has developed part of the site for a storage compound for some of its public works vehicles. Most of
the remainder of the former school site is available and appears suitable for redevelopment.
2.3 Topography & Drainage
Map 3 General Site Drainage illustrates the topography and drainage patterns for the Lavoy ASP lands.
Contour intervals are set at one meter. The height of land is 676m, located in the northeastern area of
the ASP boundary, along the eastern hamlet boundary. The lands tend to slope from north-north east
diagonally across the plan area towards the CN Railway line, south-south west.
According to the Province's Soil Information Viewer database, Lavoy is located within Polygons 16085
and 17134. Polygon 16085 covers the existing built-up hamlet site, and has the following attributes:
Eluviated Black Chernozem on medium textured materials over medium or fine textured till. The
polygon includes poorly drained and Solonetzic soils, featuring undulating high relief landform with a
limiting slope of 4%. Polygon 17134 also features Eluviated Black Chernozem on medium textured till,
with some poorly drained soils and undulating, high relief landform with a limiting slope of 4%.
South of 51st Avenue water tends to drain toward the CN Railway line. North of 51st Avenue, water
tends to drain south and east toward a low lying area contained mostly within the undeveloped area of
the Hamlet Reserve lands west of Spruce Street and south of what would be the eastern extension of
53rd Avenue. In fact, Block B contains a dugout that receives runoff from Block 8. Though developable
in theory, a more long term stormwater management solution for Block 8's stormwater (and, ultimately,
that of the entire Hamlet) will be required should the County wish to develop Block B for serviced
residential lots. It would be prudent to investigate current costs to contract the provision of a wetland
assessment and stormwater management plan for the Hamlet.
Future development will want to take into consideration the presence of poorly draining soils and
ensure positive drainage and stormwater management are established.
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ASP Area
Catchment Boundary
Catchment Number
Low Area, Poorly Drained
Direction of Drainage
LEGEND
2
General Site Drainage
MAP 3
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200 m
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Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
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2.4 Waterbodies
There are pockets of low lying land within Lavoy that likely collect spring runoff and rainfall event water
see Map 3). The status of these low lying areas has not been confirmed by way of a formal wetland
assessment. Therefore, prior to development of undeveloped land, it would be prudent to have the
lands assessed by a qualified professional for significant wetland/waterbody features.
2.5 Limiting Distances
There are two developments adjacent to Lavoy that require limiting distances. This means that certain
uses, such as residential, are not allowed to be developed within the limiting distance. The first is the old
land fill, located just south of Lavoy on the south side of Highway 16. The second is the sewage lagoons
site located southeast of Lavoy, north of Highway 16 and south of Township Road 250. Each of these
sites has limiting distances set at 300m offset from their perimeters. These limiting distances are set by
the Province of Alberta in the Subdivision and Development Regulations.
The lagoons' limiting distance does not appear to affect any existing or future residential areas within
the Hamlet of Lavoy (see Map 1). However, the landfill's limiting distance includes a number of existing
residential properties in the Hamlet (see Map 1).
Lots 3-13, Block 1, Plan 949Q are all located within, or just touching, the limiting distance of the landfill.
These properties include three existing houses. Any new and/or intensification of residential uses
proposed on these affected properties will require prior approval from the Province in addition to
County development approval, as may be required.
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
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3.0 POPULATION PROJECTION & LAND ABSORPTION
3.1 Population Projection
Population projections are inherently inaccurate because they rely on many assumptions that may or
may not hold true beyond a certain moment in time. However, they can be useful in illustrating future
need for land use planning purposes. The projections contained herein are rudimentary and are for land
use planning discussion purposes only. More rigorous projections would want to be used for capital
planning and/or engineering decision-making processes.
Population changes between 1986 and 2016 were used to analyze growth rates over the same period.
This data is summarized in Table 2. Population Statistics below. All data in Table 2 are from Municipal
Censuses.
Table 2. Population Statistics
YEAR
POPULATION
RATE OF CHANGE
ANNUAL GROWTH
RATE
1986
126
1991
100
-20.6%
-4.1%
1996
122
22.0%
4.4%
1999
119
-2.5%
-0.8%
2001
108
-9.2%
-4.6%
2006
115
6.5%
1.3%
2011
125
8.7%
1.7%
2016
105
-16.0%
-3.2%
Population growth in Lavoy has been uneven; perhaps cycling with Alberta's boom/bust economic
cycles. However, since 1986 the overall population growth trend for Lavoy has been generally
downward, with an annual growth rate over the 30-year period of -0.6%.
The largest drop in population occurred between 1986 and 1991. During this five year period the
community lost over 20% of its residents, bringing the population down from 126 to 100 residents.
Remarkably, in the following five year period between 1991 and 1996, Lavoy gained 22% more
residents, bringing the population back up to 122.
The next ten years brought the population down to 108 by 2001. But by 2011 the population was back
up to 125. The most recent Municipal Census data shows a 16% drop in population between 2011 and
2016.
Projecting population growth for Lavoy over the next 25 years, we would expect a continuation of the
downward trend punctuated with cyclic population increases and decreases. For the purposes of this
ASP, we will assume two growth scenarios: 1) trend at -0.6% annual growth and 2) modest growth at
1.0% annual growth.
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
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Scenario 1: Trend
In the trend scenario, over the next 25 years we expect the population to steadily decrease at a rate of -
0.6% per year. Projecting from the most recent census year of 2016, the 25-year future population is just
over 90 people.
This projection does not take into account cyclic jumps in population between the year 2016 and 2041,
and is therefore likely very low.
Scenario 2: Modest Growth
In the modest growth scenario, over the next 25 years we expect the population to steadily increase at a
rate of 1% per year. Projecting from the 2016 census year, the 25-year future population is just over 134
people.
This projection does not take into account cyclic jumps in population between 2016 and 2041, and is
therefore likely very low. That being said, the 30-year trend for Lavoy's population is negative annual
growth at a rate of -0.6%, so the 1% annual growth rate in scenario 2 may be optimistic. It is reasonable
to suggest that the population of Lavoy will likely continue to ebb and flow between 100 and 125 people
given the historic trend.
3.2 Land Absorption
Currently the County has ten serviced residential lots available for sale and development. An additional
11 unserviced lots are for sale. It is important to note that only lots with building sites outside the
300m landfill limiting distance will be candidates for new residential development. Regardless, the
County's existing lot inventory appears to be sufficient to accommodate the projected future additional
population.
To keep a limit on municipal servicing demands, this ASP promotes the redevelopment and infill of
existing built up residential areas that are already serviced. To the extent possible, expanding services
to undeveloped land should be avoided as long as existing serviced residential lots are available for
development or redevelopment.
Scenario 1 Land Absorption
If the population in 25 years' time is around 90 people given a -0.6% annual rate of growth, then current
housing stock and servicing levels will be sufficient, notwithstanding the need for housing renewal of
existing stock over time, and no new serviced lots would need to be brought online. Additional serviced
residential lots would also be available for purchase from the County.
Scenario 2 Land Absorption
If a 1% growth rate results in Lavoy's population reaching 134 by 2041, then it is prudent to assess the
lot availability for the increase in population. At 1.75 persons per household and a population of 134,
Lavoy by 2041 will need 17 new dwellings to house the additional 29 residents, assuming all existing
housing stock remains occupied. With a current stock of 10 serviced lots and eight unserviced lots, the
existing County supply could meet future demand. However, if demand for serviced lots exceeds the 10
available lots, consideration of the costs and benefits of bringing new serviced residential lots will be
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
9
necessary. The most logical location to bring on new serviced lots is near the Public Works Shop, as
discussed in Section 4.3 below.
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
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4.0 GENERALIZED FUTURE LAND USE CONCEPT
4.1 Overview
Lavoy, like many other small communities located along or near the rail line and highway, enjoyed much
more commercial/institutional activity in the past and served a greater surrounding area in terms of
providing services to people. Though many of the previous businesses have closed, there are existing
businesses. In fact, there has been some resurgence of commercial and other activity in recent years.
Thus, the potential is there for Lavoy to retain and attract population with redevelopment/infill
opportunities, as discussed in Section 3.0 above.
As discussed in Section 5.0 below, expanding or growing the Hamlet more significantly beyond limited
redevelopment/infill opportunity is constrained by the corresponding servicing improvement costs.
Map 4 Generalized Future Land Use Concept, can be summarized as follows:
promotes the existing residential area to be in-filled as servicing permits. Lot reconfiguration (ie:
resubdivision/consolidation) is encouraged to attract new residents by providing affordable lot
sizes larger than those offered in the Town of Vegreville.
promotes the continuation and further development of home occupations, bed and breakfast
operations and other such uses ancillary/subordinate to existing and future residential uses.
promotes opportunities related to institutional development, retirement services and so forth
(all of which being either publicly and/or privately operated).
provides for the infilling of a business industrial area to build upon the existing land use/reuse
already occurring. Providing land for and being 'development ready' to attract suitable business
industrial development is key to sustaining and growing Lavoy.
identifies a centrally located and compact area along Main Street as a direct control transitional
area tied to a specifically tailored direct control land use district in the Land Use Bylaw. This is
the best mechanism to take the existing uses into account and deal with future proposals on a
case-by-case basis. The overall purpose of this transitional designation is to achieve an
appropriate mix of commercial and residential development over time on Main Street.
The area within the Direct Control Transitional District is in transition and should consist of a mix of
residential and commercial uses that are compatible and complementary. Live-work developments
(specialty shop in the front with a resident owner living in behind) and other forms of mixed-use
commercial/ residential developments would be appropriate and are encouraged by this Plan.
4.2 Residential
4.2.1 Infill
To reduce servicing costs and make the most efficient use of existing infrastructure, residential infill and
redevelopment within the R - Residential Infill Area is encouraged. The R - Residential Infill Area
represents the existing developed areas of the Hamlet, including the downtown area. This downtown
area is designated Direct Control Transitional, as discussed below.
51 ST.
49 ST.
50 ST.
50 AVE.
TWP RD 520
Lagoon
Site
RGE RD 134
51 AVE.
52 AVE.
53 AVE.
YELLOWHEAD HIGHWAY 16
HAMLET OF LAVOY
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ASP Area
Public Works Shop
R -- Residential - Infill Area
R -- Residential - Expansion Area
DCR -- Direct Control Residential
DCT -- Direct Conrol Transitional
BI -- Business Industrial
Abandoned Well
LEGEND
Generalized Future Land Use Concept
MAP 4
0
75
150 m
1:7,500
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
11
Within this designation a number of lots, Lots 4-10, Block 1, are within the 300m limiting distance. Two
other lots, Lots 3 and 11, Block 1, are touched by the 300m limiting distance although the majority of
the lot areas remain outside the limiting distance. Development of residential uses where the building
site is within the limiting distance is not allowed. As discussed in Section 2.5 above, additional approval
from the Province may be required on lots within the limiting distance.
4.2.2 Expansion Area
The residential expansion area represents the very, very long term location for future residential once
most redevelopment/infill opportunities within the R - Residential Infill Area have been realized and
the existing vacant lots have been developed.
Development in the R - Residential Expansion Area should not occur unless a clear case for the logical
and efficient and economic extension of existing services is proven to the satisfaction of the County,
who will bear the long term operation, maintenance and upgrading costs of the services.
4.3 Direct Control
Residential
Should existing serviced lot demand be exceeded, additional serviced lots could be brought on line near
the existing Public Works Shop (see Map 5 Possible Residential Layout for DCR Area). Additionally,
some consideration should be given to providing for up to 8 unserviced residential lots on the
remaining area of the former school site and to the northwest of the former school site (see Map 3).
Though not connected to municipal water and sanitary sewer services, developing these additional
unserviced lots could bring Lavoy's population to approximately 200 should demand for land outstrip
supply.
Transitional
The area within the DCT - Direct Control Transitional designation is in transition and should consist of a
mix of residential and commercial uses that are compatible and complementary. Live-work
developments (specialty shop in the front with a resident owner living in behind) and other forms of
mixed-use commercial/ residential developments would be appropriate and are encouraged by this
Plan.
4.3 Business Industrial
The BI - Business Industrial designation takes advantage of good visibility from Highway 16 and possible
rail line access. Appropriate buffers between non-residential uses and existing residential properties
need to be established.
4.5 Municipal Reserve
Any municipal reserve owing for the lands within this ASP will be taken either in the form of land or
cash-in-lieu of reserve land. No municipal reserve land is proposed to be deferred by caveat within the
Plan area.
4.6 Sequence of Development
As is normally the case, development sequence will be dependent on the logical extension of municipal
services, fiscal realities, market demand and landowner willingness.
51 ST.
50 ST.
RAILWAY AVE.
RGE RD 134
51 AVE.
52 AVE.
53 AVE.
3
5
8
9
4
17
23
16
10
1
9
9
1
9
17
23
16
10
1
5
7A
6A
17
23
1
1
2
2
3
3
4
4
8
8
9
10
11
7
7
6
6
5
PUL - Public
Works Shop
5
10
23
10
23
10
1
18
19A
22A
25A
27
26
10
14A
13
1
9
PUL - Public Works Shop
Up to 11 lots connected
to piped water and sewer
Up to 8 lots with on-site
water and sewer
LEGEND
Possible Residential Layout for DCR Area
MAP 5
0
20
40 m
1:2,000
Water Fill
Station
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
12
4.7 Highway Design Policies
Development adjacent to Highway 16 should exhibit a good standard of appearance to further the
image of the Hamlet. It is recommended that appearance, screening, landscaping and siting of
development be attended to in approving any subdivision or development along the highway interface.
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
13
5.0 SERVICING & UTILITIES
Associated Engineering Alberta Ltd. prepared a Master Stormwater Management Plan and a Master
Servicing Plan for Lavoy in 2008 and 2009 respectively. Both documents are attached to this ASP for
information in Appendix A.
5.1 Stormwater
The Master Stormwater Plan examined the existing drainage system in Lavoy and found that it currently
provides an adequate level of service with some upgrades identified to improve drainage conditions and
reduce the risk of potential flooding of private properties in several areas. The Master Servicing Plan
examined all water and sanitary sewer facilities in terms of their current capacities as well as the
improvements that would be required based on various projected population levels. Though a small
population increase can be absorbed and serviced without major improvements to the Hamlet's
servicing infrastructure, significant population growth in the Hamlet will require correspondingly
significant improvements. Though the Master Servicing Plan did not provide cost estimates, it is safe to
say that the cost of the improvements required would not be insignificant.
5.2 Sanitary & Lagoon
The existing sanitary system is depicted in Map 6 Sanitary Sewer System. The existing sewage lagoon
facilities may need to be upgraded to meet current provincial standards regardless of population
growth. Current water storage capacity is sufficient for a population of up to 145 people. Neither
population projection scenario from Section 3.0 above results in a population of 145.
5.3 Water
Lavoy's water supply is provided via the ACE Regional Waterline as shown in Map 7 Water Distribution
System. Water demand is assumed to be 365 L/c/d (liters per capita per day), using the Associated
Engineering Municipal Servicing Study figures. With a projected population of up to 134 by 2025, water
demand for Lavoy will be 48,910 L/d. This demand should be easily met by the ACE Regional Waterline.
5.4 Utility Services
Utility easements will be established where necessary for all franchised utilities at the time of
subdivision. Any existing utility ROW's significantly hindering future subdivision/development will be
encouraged to be relocated.
HAMLET OF LAVOY
51 ST.
49 ST.
50 ST.
50 AVE.
TWP RD 520
RGE RD 134
51 AVE.
52 AVE.
53 AVE.
YELLOWHEAD HIGHWAY 16
Abandoned
Well
Old
Land
Fill
30
0
m Limiting
D
is
ta
nc
e
30
0
m
Li
mi
tin
g
Di
st
an
ce
Lagoon Site
ASP Area
200mm Ø Sanitary Sewer
250mm Ø Sanitary Sewer
Manhole
LEGEND
Sanitary Sewer System
MAP 6
0
100
200 m
1:10,000
HAMLET OF LAVOY
30
0
m
Li
mi
tin
g
Di
st
an
ce
TWP RD 520
RGE RD 134
YELLOWHEAD HIGHWAY 16
Lagoon Site
51 ST.
49 ST.
50 ST.
50 AVE.
51 AVE.
52 AVE.
53 AVE.
Abandoned
Well
Old
Land
Fill
30
0
m Limiting
D
is
ta
nc
e
Water
Treatment
Plant
Water Fill
Station
ASP Area
ACE Regional Water Line
150mm Ø Watermain
75mm Ø Watermain
Hydrant
LEGEND
Water Distribution System
MAP 7
0
100
200 m
1:10,000
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
14
6.0 ROADS & ACCESS
6.1 Internal Road System and Pedestrian Movement
All new roads provided within this ASP will be constructed to County standards. Also, it is important
that the safe and efficient movement of pedestrians is accounted for in the design and development of
the Plan area.
6.2 Highway 16 Access Management
Alberta Transportation (AT) commenced an access management study exercise in 2010 for Highway 16
between Elk Island National Park and Highway 36. Associated Engineering was retained to prepare the
study document (the Study).
Around Lavoy, the Study shows all at-grade access points removed and Highway 16 converted to
freeway status (see Map 8 Highway 16 Access Plan). In practice what this means is that access to
Highway 16, in the very long term, will be limited to existing and proposed interchange locations.
Further, it means that new direct accesses onto Highway 16 will not be allowed. Last, it means that upon
removal of the at-grade accesses to Highway 16 in the very long term, primary access to Lavoy will be
from the north along Range Road 134, or from the east along Township Road 520.
According to open house display panels accessed from the Alberta Transportation webpage related to
this project, the two closest future interchange locations to Lavoy will be at Highway 857 in Vegreville
and at Highway 36, east of Lavoy. Access to these interchanges from Lavoy requires travel on the
existing local road network. The local roads used for primary access routes may need be upgraded to
support the proposed additional usage.
Presumably removal of the at-grade access at Lavoy will be dependent upon completion of the
interchanges at Highways 857 and 36 to provide alternative access to Highway 16. According to the
2017-2020 Provincial Construction Plan on AT's website, neither interchange is slated for development.
It is likely the at-grade access will remain in place at Lavoy into the very long term. However, it is
worthwhile considering the implications of its removal in this Plan.
6.3 Traffic Impact Assessment (TIA)
This ASP acknowledges that, at some point, a Traffic Impact Assessment (TIA) may be required as part of
subsequent subdivision and development within the Plan area. It is further understood that any TIA
conducted must be to the satisfaction of the County as well as Alberta Transportation.
TWP RD 514
TWP RD 520
TWP RD 522
TWP RD 524
RGE RD 144
RGE RD 143
RGE RD 142
RGE RD 141
RGE RD 140
RGE RD 135
RGE RD 134
RGE RD 133
RGE RD 132
RGE RD 130
HIGHWAY 16
LAVOY
HIGHWAY 857
HIGHWAY 36
0
750
1500 m
1:75,000
Highway 16
Other Highways
Existing Roads
Proposed Re-Alignment
Proposed Access Route
CN Railway
Interchange Access Point
Access to be Closed
Lavoy Access Point
LEGEND
Highway 16 Access Plan
MAP 8
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
15
7.0 FORCE & EFFECT
The Hamlet of Lavoy Area Structure Plan (Lavoy ASP) is intended to refine existing general policy
direction and land use designations assigned to these lands within the County's Municipal Development
Plan, guide/confirm the assignment and implementation of land use districts to the lands within the
County's Land Use Bylaw as well as establish a sound framework for future decisions on land use,
subdivision, servicing and development permits. It must be noted that in making future decisions
concerning the use, subdivision and development of the lands within the Lavoy ASP, the County will
need to remain mindful of and monitor the capacities of both on and off-site services and make any
necessary adjustments to uses, densities and lots sizes within the Lavoy ASP accordingly.
Policy 1
The County shall ensure that all future land use, subdivision, development,
amendment and servicing decisions made regarding lands within the Hamlet of Lavoy Area
Structure Plan (Lavoy ASP) comply with the provisions contained in the Lavoy ASP including
Map 4 Generalized Future Land Use Concept. Should such a decision require or amount to a
major deviation from or relaxation/variation of the provisions of the Lavoy ASP, an
amendment to this Plan shall be required. Decisions that would result in or amount to a
minor deviation from or relaxation/variation of the provisions of the Lavoy ASP may be
considered without an amendment where it can be demonstrated to the satisfaction of the
County that the deviation, relaxation or variation does not substantively alter the intent,
force or effect of the provisions of the Lavoy ASP.
Policy 2
It is intended that the Lavoy ASP, its concepts and provisions are used in tandem with the
relevant provisions of the County of Minburn No. 27 Municipal Development Plan and Land
Use Bylaw, particularly in guiding the exercise of discretion in rendering decisions on
subdivision and development permit applications. The Lavoy ASP will be used to guide any
required amendments to the provisions or land use designations or districts in the County
of Minburn No. 27 Municipal Development Plan or Land Use Bylaw.
Policy 3
The exercise of discretion and variance related to any matter or decision rendered with
respect to the Lavoy ASP as well as the amendment of the Lavoy ASP shall be guided by the
following principles:
a)
The exercise of variance or discretion in deciding an application or an amendment to
the Lavoy ASP must be both reasonable and defensible within the letter and spirit of
the Lavoy ASP as well as widely accepted planning principles.
b)
If a requirement or provision of the Lavoy ASP is to be deviated from or if an
amendment is to be made, it is essential that those exercising the discretion or
deciding upon variance or making the amendment clearly understand the rationale
behind the requirement or provision they are being asked to vary or amend.
c)
Discretion, variance and amendment shall only be considered if it can be
demonstrated that the discretion, variance or amendment being considered will, at a
minimum, not jeopardize the policies of the Lavoy ASP and, at best, better serve them.
d)
Any variance or discretion exercised or any amendment made shall be fully
documented so that the reasons and rationale for the variance or discretion exercised
or the amendment are accurately recorded and clearly understood.
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
16
Policy 4
Should an owner/developer make repeated applications to amend the Lavoy ASP once it is
in effect, the County may undertake or require that the owner/developer undertake an
overall review of the Lavoy ASP instead of continuing to entertain individual, isolated
amendment applications so that the implications of the revisions to the Lavoy ASP can be
considered and evaluated, at a minimum, in the context of the entire Lavoy ASP area and, if
warranted, beyond the Lavoy ASP area.
Policy 5
With respect to all new development or any redevelopment in proximity to Highway 16
within the Lavoy ASP, the County will ensure an elevated standard both with respect to
landscaping and screening standards as well as architectural appearance. This will be
achieved using the various mechanisms at their disposal in the Land Use Bylaw. Pedestrian
connectivity shall also be considered as part of any decision being made at the subdivision
level.
Policy 6
For the purposes of Section 638 of the Municipal Government Act, notwithstanding
anything to the contrary, the provisions of the Lavoy ASP, being Bylaw No. 1261-17 and any
amendments thereto, serve to refine, articulate, specify and otherwise constitute the
provisions of the County of Minburn No. 27 Municipal Development Plan as it applies to the
lands within the Lavoy ASP.
Policy 7
Should the County consider it appropriate to do so, a prerequisite of which being the
submission of an application to amend the County of Minburn No. 27 Land Use Bylaw and a
subdivision application, both of which deemed by the County to be in their complete form
with all required tests and supporting information (including a conceptual scheme)
consistent with the HLDCR - District, the County may assign the HLDCR - District to and
consider subsequent subdivision of a portion or all of the land designated R - Residential
Expansion on Map 4, being the Generalized Future Land Use Concept.
Policy 8
All site preparation, public utilities, public roads, pedestrian walkways and any other public
facilities/improvements shall be constructed to the satisfaction of the County in accordance
with the County's standards.
Policy 9
Subdivision and development permit applications shall comply with the current Alberta
Environment & Parks (or its successor) requirements for stormwater management. There
shall be no change between pre- and post-development off-site flows except where the
application conforms to an approved stormwater management plan approved in
conjunction with the County.
Policy 10
Subdivision and development permit applicants shall be responsible for making all
necessary arrangements regarding the disposal/management of stormwater off-site and
providing to/for the County all required documentation, permission, approvals and/or
other forms of authorization from all relevant agencies having jurisdiction in relation
thereto.
Policy 11
As a condition of subdivision or development approval pursuant to the Lavoy ASP, the
applicant/owner/developer may be required to prepare, at their sole expense, a Traffic
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
17
Policy 12
Policy 13
Policy 14
Policy 15
Policy 16
Policy 17
Policy 18
Impact Assessment (TIA), the need, timing and scope of which as determined by the County
and Alberta Transportation. The TIA prepared shall be to the satisfaction of the County as
well as Alberta Transportation.
Any engineering, requirements or improvements identified in or resulting from the TIA
approved by the County and Alberta Transportation, or any other engineering, requirement
or improvement specified by Alberta Transportation in relation to Highway 16 as a result of
or that is attributable to the development of the Lavoy ASP area must be undertaken to the
satisfaction of Alberta Transportation, in consultation with the County, at the sole cost of
the applicant/owner/developer.
The County shall pursue whatever actions are deemed appropriate or necessary to secure
compliance with the provisions of the Lavoy ASP.
The County may require owner(s)/developer(s) to enter into an agreement with the County
as a condition of an approved subdivision or development permit application pursuant to
the Municipal Government Act.
The County may require caveats, performance bonds, letters of credit, restrictive covenants
or any other available mechanisms to secure performance of any requirement stipulated in
the provisions of the Lavoy ASP.
Any amendments to the County of Minburn No.27 Municipal Development Plan or Land
Use Bylaw required as a result of the adoption of the Lavoy ASP will be undertaken by the
County.
The County will monitor the Lavoy ASP on an on-going basis. Notwithstanding, the ASP will
be reviewed within five years of being adopted (by 2023).
The County of Minburn No. 27 shall require landowners of the lots affected by the 300m
limiting distance around the landfill to obtain approval from the Province for any
intensification of use prior to obtaining municipal approval for the same.
Hamlet of Lavoy ASP Bylaw 1261-17
COUNTY OF MINBURN
1
APPENDIX A
(not forming part of this Bylaw)
Report
County of Minburn No. 27
Hamlet of Lavoy
Master Servicing Plan
December 2010
CONFIDENTIALITY AND © COPYRIGHT
This document is for the sole use of the addressee and Associated Engineering Alberta Ltd. The document contains proprietary and
confidential information that shall not be reproduced in any manner or disclosed to or discussed with any other parties without the express
written permission of Associated Engineering Alberta Ltd. Information in this document is to be considered the intellectual property of
Associated Engineering Alberta Ltd. in accordance with Canadian copyright law.
This report was prepared by Associated Engineering Alberta Ltd. for the account of County of Minburn No. 27. The material in it reflects
Associated Engineering Alberta Ltd.'s best judgement, in light of the information available to it, at the time of preparation. Any use which a third
party makes of this report, or any reliance on or decisions to be made based on it, are the responsibility of such third parties. Associated
Engineering Alberta Ltd. accepts no responsibility for damages, if any, suffered by any third party as a result of decisions made or actions
based on this report.
REPORT
i
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Table of Contents
SECTION
PAGE NO.
Table of Contents
i
List of Tables
iii
List of Figures
iv
Abbreviations
v
List of Photos
vi
1
Introduction
1-1
1.1
Background
1-1
1.2
Study Area
1-1
1.3
Project Scope
1-2
2
Water Supply and Distribution
2-1
2.1
System Overview
2-1
2.1.1
Raw Water Supply
2-1
2.2
Design Criteria
2-6
2.3
System Assessment
2-14
3
Sanitary Sewer System
3-1
3.1
System Overview
3-1
3.2
Design Criteria - Santitary Sewer System
3-1
3.3
Sanitary Sewer System - Assessment
3-4
4
Cost Estimate
4-1
4.1
Water Distribution System
4-1
4.2
Sanitary Sewer System
4-1
5
Conclusions
5-1
5.1
Water System
5-1
5.2
Sanitary Sewer System
5-1
5.3
Stabilization Lagoon Sewage Treatment Facility
5-1
County of Minburn No. 27
Table of Contents
ii
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6
Recommendations
6-1
6.1
Water Supply System
6-1
6.2
Sanitary Sewer System
6-1
Appendix A - Water Distribution Pumps Curve
Appendix B - Historical Water Record Data
Appendix C - Model Results
List of Tables
iii
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List of Tables
PAGE NO.
Table 2-1
Raw Water Supply - Pumping Capacity
2-3
Table 2-2
Treated Water Reservoir Capacity
2-4
Table 2-3
Pumping System Capacity
2-5
Table 2-4
Projected Population
2-8
Table 2-5
Projected Water Demand
2-10
Table 2-6
Fire Flows
2-11
Table 2-7
Minimum Water Storage Requirement (per Alberta Environment)
2-13
Table 2-8
Recommended Water Storage - One Peak Day Plus Fire Flow
2-13
Table 2-9
Raw Water Demand Assessment
2-14
Table 2-10
Submersible Pump Capacity Assessment
2-15
Table 2-11
Water Storage Reservoir - Assessment
2-18
Table 2-12
Pumping System Capacity Assessment
2-20
Table 3-1
Wastewater Lagoon Requirements - AEP
3-4
Table 3-2
Sanitary Sewer Analysis - Existing Development
3-5
Table 3-3
Sanitary Sewer Design - Future Development
3-6
Table 3-4
Sewage Lagoon Requirements
3-7
iv
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List of Figures
PAGE NO.
Figure 1-1
Location Plan
1-3
Figure 1-2
Future Land Use Plan
1-4
Figure 2-1
Existing Water System
2-2
Figure 2-2
Existing Water Distribution System
2-7
Figure 2-3
Historic Raw Water Supply Trends in Lavoy
2-17
Figure 2-4
Water Treatment Plant Pumps Curve and Flow Capacity
2-19
Figure 2-5
Available Fire Flow with Existing Water System and Proposed Fire Pump
2-22
Figure 2-6
Existing Water Distribution System - Peak Day Plus Fire Flow - System
Upgrades
2-23
Figure 2-7
Hydrant Coverage
2-24
Figure 3-1
Existing Sanitary Sewer System
3-2
v
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ABBREVIATIONS
AC
asbestos cement
AE
Associated Engineering Alberta Ltd.
AEP
Alberta Environmental Protection
CCTV
closed circuit television
PVC
polyvinyl chloride
fps
feet per second
ft3
cubic feet
ft3/s
cubic feet per second
ha
hectare
igpad
imperial gallons per acre day
igpm
imperial gallons per minute
ig
imperial gallons
igpcd
imperial gallons per capita day
km
kilometre
kPa
kilopascal
L
Litre
L/s
Litres per second
L/c/d
Litres per capita per day
Lpcd
Litres per capita per day
Lphad
Litres per hectare daily
Lpm2d
Litres per square metre daily
mm
millimetre
m
metre
m3
cubic metre
m3/s
cubic metre per second
m/s
metres per second
m3phad
cubic metres per hectare daily
usgm
US gallons per minute
County of Minburn No. 27
List of Photos
vi
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List of Photos
PAGE NO.
Photo 2-1
Raw Water Well No. 1
2-1
Photo 2-2
Reservoir No. 3
2-3
Photo 2-3
Existing Distribution Pumps
2-4
REPORT
1-1
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1
Introduction
1.1
BACKGROUND
The County of Minburn requested Associated Engineering to prepare a Master Services Plan for the Hamlet
of Lavoy. The Hamlet of Lavoy is located south east of Highway 16, within the boundaries of the County of
Minburn No. 27, approximately 12 kilometres east of the Town of Vegreville.
Figure 1.1 shows the general outline of the existing Hamlet. The Hamlet includes the following:
-
A population of approximately 110 people living in 50 homes;
-
16 lots that have been developed with a building but do not contain occupied dwelling units;
-
37 vacant lots that have been serviced but have not been developed;
-
20 lots that remain to be serviced in the south part of the Hamlet, between 1 Avenue and 2 Avenue,
and south of Spruce Street;
-
7 lots in the Block 8 area that have been serviced and are planned to be offered for sale once 3
Avenue and Spruce Street are completed.
The objective of the Master Services Plan is to assess how many lots can be developed with the existing
capacity of the sewer and water systems. The assessment will also include a general assessment of the
system expansion that would be required to accommodate future growth of the Hamlet as anticipated in the
draft Area Structure Plan recently completed in December 2009.
1.2
STUDY AREA
The Hamlet of Lavoy area is comprised of 51 single residential homes, the Antique Collectible Store, and
Health Retreat and Spa, Senior's Centre, Community Hall and Public Works yard. There are approximately
110 residents living in the Hamlet at present according to the 2009 draft Area Structure Plan.
The County specified that the Master Services Plan would provide for growth of the Hamlet to a population
of 187 people. This would accommodate the following areas:
-
7 lots in Block 8 that were developed in 2009.
-
6 lots in Block B that are yet to be developed.
-
11 serviced lots on the former school site that are yet to be developed (plus Public Works yard
which is a minor water user and can be ignored in the analysis).
-
10 infill lots within the currently developed areas.
This growth scenario represents development of 34 additional lots or an additional population of 75 people
based on current population densities.
1
County of Minburn No. 27
1 - Introduction
1-2
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In addition, the ASP provides for the option of developing 8 unserviced lots to the north of Lavoy which
would not be connected to the sewer or water distribution systems and therefore can be neglected in the
system analysis.
The Area Structure Plan, provided by the County of Minburn (Figure 1.2) represents a long term plan for the
Hamlet. In the long term, new developments are planned to the north east of Highway 16. No provision is
made in the Master Services Plan for the long term development.
1.3
PROJECT SCOPE
The Master Services Plan will include:
-
Review the capacity of the sanitary sewer system using current design standards for the new
development and the best estimates of flow rates from the existing developed areas.
-
Determine how many lots can be developed with the existing servicing capacity.
-
Estimate the increased flow with the proposed infill development.
-
Identify whether upgrading is required to service the existing and proposed new development.
The MSP includes a review of the water supply/distribution system to confirm that it has enough capacity for
the existing and future development. It includes a review of the source water supply.
Associated Engineering completed a separate review of the overall stormwater management requirements
for the Hamlet in 2007 published in the "Hamlet of Lavoy Storm Water Management Plan", November 2008.
4
52-13-4
REPORT
2-1
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2
Water Supply and Distribution
2.1
SYSTEM OVERVIEW
The water system for Hamlet of Lavoy consists of the following components (Figure 2.1):
-
Raw Water Supply
-
Water Treatment Plant (WTP)
-
Treated Water Reservoir
-
Water Distribution System
2.1.1
Raw Water Supply
Raw water is supplied to Lavoy from three (3) existing wells, located approximately 2 km northeast
of the Hamlet. Based on the report by Hydrological Consultants Ltd., "County of Milburn No. 27,
Hamlet of Lavoy Groundwater Availability - Phase 3", September 2002, the three water supply
wells are licensed by Alberta Environment (AENV) for a total annual diversion of 32,000 cubic
metres per year (87.9m3 /day). Photo 2.1 shows well No. 1.
Photo 2.1
Raw Water Well No. 1
Each well has a submersible pump, which is pumping the raw water through a 75 mm diameter
PVC supply water line to the Water Treatment Plant. The wells are controlled remotely by radio
from the Water Treatment Plant. The pumps were last upgraded in 2009, with the SCADA radios
replaced at the three well sites and a new pump and flow restrictor installed at Well #1.
Each submersible raw water pump has the following characteristics, see Table 2.1.
2
County of Minburn No. 27
2 - Water Supply and Distribution
2-3
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Table 2-1
Raw Water Supply - Pumping Capacity
Pumping Capacity
Item No.
Location
(L/s)
m3/d
1
Well No. 1 - Pump 1
0.27
23.7
2
Well No. 2 - Pump 2
0.34
29.2
3
Well No.3 - Pump 3
0.24
20.7
4
Total
0.85
73.6
2.1.2
Water Treatment Plant
The Water Treatment Plant is located in the south-east part of Lavoy. The plant includes the
following:
-
One (1) package water treatment plant
-
Two (2) treated water reservoirs (the main reservoir plus the smaller clearwell which is also
the pumpwell)
-
Two (2) distribution pumps
The Water Treatment Plant is an in-line package, comprised of the following:
-
Chemical feeders
-
Mixer
-
Iron removal filter
-
Backwash system.
There are two (2) treated water reservoirs
-
Clearwell Reservoir No. 1
-
Reservoir No. 2
The Clearwell Reservoir No. 1 is located below the water treatment plant building and the Reservoir
No. 2 is located to the south of the water treatment plant building (Photo 2.2).
County of Minburn No. 27
2 - Water Supply and Distribution
2-4
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Photo 2.2
Reservoir No. 2
The total storage capacity of the two reservoirs is shown on the following table:
Table 2-2
Treated Water Reservoir Capacity
Item No
Description
Volume (m3)
1
Clearwell No. 1
94.5
2
Reservoir No. 2
338.6
3
Total
433.1
The two distribution pumps are vertical turbines, WilronCrown Model S6-80 ten-stage pumps
(Photo 2.3).
County of Minburn No. 27
2 - Water Supply and Distribution
2-5
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Photo 2.3
Existing Distribution Pumps
The pumps have Selector Switches that will allow alternating the Lead pump.
The Lead pumps will run continuously. The Lag pump may be started manually if a high demand
situation occurs.
The capacity of each of the pumps is shown in the following table:
Table 2-3
Pumping System Capacity
Item No.
Description
Status
Capacity
1
Lead Pump*
ON
3.8 L/s @ 345 kPa
(50 psi)
2
Lag Pump*
OFF
3.8 L/s @ 345 kPa
Combined
Both Pumps Running
ON
7.6 L/s @ 345 kPa
* The two pumps have Selector Switches that will allow the operator to alternate the Lead
pump. The alternation is done weekly.
The Pump Curve is shown in Appendix A.
County of Minburn No. 27
2 - Water Supply and Distribution
2-6
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2.1.3
Water Distribution System
The water distribution system is comprised of 150 mm diameter AC (asbestos cement) pipes that
convey water from the Water Treatment Plant throughout the Hamlet of Lavoy. The system was
installed in 1979 to provide services to what was then the Town of Lavoy. The water distribution
system was upgraded in 2003 to replace curb cocks and add a loop on Elm Street.
Figure 2.2 shows the overall water distribution system in the Hamlet.
System pressures are controlled with a pressure-reducing valve (PRV) located at the water
treatment plant.
2.2
DESIGN CRITERIA
2.2.1
References
The design criteria have been adopted from:
-
Hamlet of Lavoy - record data
-
Alberta Environment Standards and Guidelines for "Municipal Waterworks, Wastewater and
Storm Drainage Systems", December 1997.
2.2.2
Population
One of the variables in assessing the water system of a community is the population. The
population will:
-
Determine the quantity of water consumed;
-
Have an impact on the peaking hour;
-
Have an impact on the distribution system based on population density;
-
Determine the requirement for fire flows.
The projected population is summarised in the following table:
County of Minburn No. 27
2 - Water Supply and Distribution
2-8
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Table 2-4
Projected Population
Added Land Use
Population
Density
Item No.
Description
Residential
(Homes)
Residential
Cumulative
Population
1
Existing
51
2.2 people per
household*
112
2
Future
34
2.2 people per
household
75
3
Total
85
187
* The population density was determined based on the existing population divided by the lot numbers.
The data indicates full development would increase the population to about 187 people.
2.2.3
Water Demand
Water demand is critical in determining the distribution network, pumping capability and storage
required for water system.
There are three (3) critical rates of demand normally used:
-
Average Day
-
Peak Day
-
Peak Hour
Fire flows in conjunction with the peak day are used to test the water system capability to deliver
water and meet the system demand.
2.2.4
Average Day
The Average Day demand is determined by dividing the total annual consumption by 365 days. By
dividing this rate by the population served, the "Per Capita Per Day Demand" is derived. This rate is
used primarily as a basis for the projection of the total water demand.
County of Minburn No. 27
2 - Water Supply and Distribution
2-9
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An average day demand of 365 L/c/d will be used for the study. Historical water distribution
pumping records for 2003 to 2008 were provided by the County of Minburn and have been
summarized in Appendix B. The analysis shows that for the period from 2003 to 2009, the average
raw water supply to the Hamlet was 375 litres per person per day (L/c/d). It includes the filler
backwash at the water treatment plant which accounts for about 10% of the daily total raw water
supply.
2.2.5
Peak Day
The Peak Day demand is the single day of maximum consumption observed in the distribution
system. In using the single day maximum flow, one must ensure that the record is not distorted by
fire fighting demand, equipment malfunction or watermain breaks. To project the future peak
demand, a peak day to average day ratio is used. The Peak Day demand is used in determining
the delivery capacity required of the raw water supply mains, treatment facilities, storage facilities,
transmission main and pumping facilities at the raw water treatment plant. This demand with the fire
flow is used to test the water system's capacity.
Based on the historical water records (see Appendix A), the ratio of peak day flow to average day
flow is approximately 1.85. This peak flow factor is fairly close to most recommended peak day
factor in a water system (2.0) observed in many communities. Therefore, for the purpose of this
report, the Peak Day demand of 2 times the Average Day will be used.
ie, P.D. = A.D. x 2.0
2.2.6
Peak Hour
The Peak Hour demand is the expected maximum demand observed during a short period of the
day. Usually, most facilities are not equipped to record peak hour demands in such detail.
Therefore, the rate is established based on experience and judgement. The Peak Hour rate is used
in determining water main sizing and pumping requirements.
For Peak Hour a peaking factor of 2.0 times Peak Day, or 4.0 times Average Day, will be used.
ie, P.H. = A.D. x 4.0
The following table summarizes the water demand for the Hamlet of Lavoy:
County of Minburn No. 27
2 - Water Supply and Distribution
2-10
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Table 2-5
Projected Water Demand
Description
Units
Existing
Future
No. of Lots
51
85
Density
people/lot
2.2
2.2
Population
people
112
187
Consumption
l/c/d
365
365
l/s
0.47
0.79
Avg. Day
m3/d
40.9
68.26
l/s
0.95
1.58
PEAK DAY
2 x (AD)
m3/d
81.8
136.51
l/s
1.89
3.16
PEAK HOUR
4 x (AD)
m3/d
163.5
273.02
2.2.7
Fire Flows
The Table 2.6 gives the flow required in accordance with the suggested values by the Fire
Underwriters Survey, a national organization that provides fire risk data to 85% of the insurance
companies of Canada:
The suggested flows, based on Fire Underwriter's Guidelines are determined as follows:
F= 220 C√ A where:
F
= required fire flow in litres per minute
C
= 1.5 for wood frame construction
= 1.0 for ordinary construction
= 0.8 for non-combustible construction
= 0.6 for fire flow resistant construction (fully protected frame, floors, roof)
A
= total floor area in square metres (including all storeys)
Other considerations when determining the fire flow requirements are:
-
Occupancy hazard
-
Automatic sprinkler protection
County of Minburn No. 27
2 - Water Supply and Distribution
2-11
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-
Exposure within 45 metres
Based on the largest building in Lavoy, the Health Retreat and Spa, the recommended fire flow is
4,400 L/min or 73.3 L/s.
Table 2-6
Fire Flows
Recommended Fire Flow
Description
Litres/Minute
Litres/Second
1.
Single Family Residential
Wood Frame construction, two stories or less
100 m2 to 150 m2
150 m2 to 275 m2
5,000
6,000
83
100
2.
Multi Family Residential
Wood frame construction c/w fire separator
Four units up to 100 m2 each
8,000
133
3.
Walk-up Apartments
Ordinary construction up to 3,200 m2 (10-20 m
separation)
12,000
200
4.
Schools
Non-combustible construction (15% exposure)
Up to 3,300 m2
Up to 4,000 m2
Up to 12,000 m2
10,000
11,000
19,000
167
187
317
5.
Institutional, Churches
Ordinary construction (15% exposure) up to 850 m2
6,000
100
6.
Commercial
Non-combustible construction (5 % exposure)
Up to 2,900 m2
Up to 4,200 m2
11,000
14,000
183
233
7.
Light Industry
Non-combustible construction
Up to 2,900 m2 (25% exposure)
Up to 2,900 m2 (50% exposure)
9,000
11,000
150
193
8.
Low Density Rural Residential
2 stories or less over 30 m separation
2,000
33
9.
High Density Rural Residential
2 stories or less 10.1 to 30 m separation
3,000
50
County of Minburn No. 27
2 - Water Supply and Distribution
2-12
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2.2.8
Operating Pressure
The principle requirement to be considered in the water distribution system is the operating
pressure.
The recommended normal system operating pressures are:
-
Minimum pressure at peak demand
350 kPa
-
Maximum system pressure
650 kPa
The minimum system pressures during a fire event are:
-
Residential pressure at demand hydrant
140 kpa
-
Zone pressure with or without sprinklers
280 kPa
The minimum recommended pipe diameters are:
-
Single family residential
200 mm
-
Multi family development
250 mm
-
Industrial/Commercial
300 mm
As noted previously, the water distribution system in Lavoy is composed of 150 mm pipes which
are smaller than the minimum size normally recommended for fire flow requirements.
2.2.9
Hydrant Spacing
Based on the Fire Underwriters Survey the maximum recommended spacing of hydrants is as
follows:
-
Single Family
180 m (90 m radius)
-
Multi Family
90 m (45 m radius)
-
Commercial
110 m (55 m radius)
2.2.10 Water Storage
It is good practice to provide adequate storage in a water system for operational needs (peak hour),
supply interruption and fire flow demand. Design guidelines vary depending on the size of the
community and the capital cost involved. Alberta Environment guidelines require:
-
Equalization storage (peak hour demand);
25% of maximum daily flow
-
Emergency storage (in event of supply interruption):
15% of average daily flow
County of Minburn No. 27
2 - Water Supply and Distribution
2-13
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-
Fire storage:
73.3 L/s for 1.75 hours duration
fire flow, or a total volume of 462
m3
The water storage requirement based on the fire flows and projected population is shown in the
following table.
Table 2-7
Minimum Water Storage Requirement (per Alberta Environment)
AEP
Existing
(m3)
Future
(m3 )
15 % Average Day
6
10
25 % Peak Day
20
34
Fire Storage
462
462
Total Storage *
488
506
Water storage requirements for systems with long supply lines or distances from the source of
water are at a higher risk of supply interruption. In those cases, common practice is to provide one
(1) peak day plus fire storage.
As the Hamlet of Lavoy reservoir is filled via a long supply main, it is recommended to adopt the
one peak day plus fire storage criteria.
Table 2-8
Recommended Water Storage - One Peak Day Plus Fire Flow
Item
Existing
(m3)
Future
(m3)
Peak Day (m3)
80
137
Fire (m3)
462
462
Total (m3)
542
599
Note that the existing system has 433 m3 of storage capacity which is less than the recommended
minimum of 542 m3 for existing development based on fire flow plus peak day demand.
County of Minburn No. 27
2 - Water Supply and Distribution
2-14
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2.2.11 Pipe Roughness Coefficient ("C" value)
The following "c" values for various pipes, used in the hydraulic model to assess pipe flow, were
adopted:
-
PVC 130 (PVC New=140)
-
Asbestos Cement (AC) 110
2.2.12 Pipe Velocity
Water velocity is the main criteria in pipeline design. Sudden changes in velocity can create
pressure surges and possibly negative pressure, which can raise serious pipe (equipment)
damage. Increased velocities require higher pumping heads, hence higher energy costs.
The recommended maximum velocity is 1.5 m/s in polyvinylchloride, asbestos, cement, and
polyethylene pipes. Higher velocities can be safely used in steel and ductile iron pipelines, provided
proper surge allowance and surge suppression is provided.
2.3
SYSTEM ASSESSMENT
2.3.1
Raw Water System Assessment
The three water wells are the source of raw water supply to the water treatment plant.
The projected raw water demand, based on historic data, is shown in the following table.
Table 2-9
Raw Water Demand Assessment
Peak Day Water Demand
(m3/d)
Item
No
Demand
Type
(m3/d)
Existing
Licensed
Withdrawal*
(m3/d)
Estimated
Well
Capacity
(m3/d)
Existing
Future
1
Average Day
87.9
49.0*
40.2
68.3
2
Peak Day
180
80.7**
80.3
136.5
3
Assessment
OK
Upgrade
*Existing Licensed Withdrawal volume and Long-Term Yield are based on Hydrological Consultants Ltd.,
County of Minburn No. 27 - Hamlet of Lavoy 052-13 W4M, Groundwater Availability Phase 3, September
2002, report.
**Estimated from recent pump and water level data.
County of Minburn No. 27
2 - Water Supply and Distribution
2-15
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Data provided by the County indicates that there may be a leak in the distribution system which has
recently increased the water supply rates by about 35%. Figure 2.3 shows a time plot of the actual
water supply rates in Lavoy reconstructed from data from the County's SCADA system. The data
indicate a historic demand from the hamlet of about 40 m3/d, which has increased to about 55 m3/d
in recent months. The recent demand is less than the licensed withdrawal (88 m3/d) but higher
than most recent estimate of long term yield (in 2002) of 49 m3/d.
Review of the water level data indicates that Wells 2 and 3 are operating at capacity. Well 2 is
exceeding its licensed rate. Water levels in Well 1 are being drawing down to about 15 m above the
pump (50 m below static level) which suggests that pumping rates from Well 1 could potentially be
increased.
As shown in Figure 2.3, the metered data (sum of all water meters in Lavoy) indicate an average
consumption of about 22 m3/d which is about 50% of the total raw water usage. This suggests
either that significant leakage is occurring or that there is significant un-metered water usage.
The assessment of the existing submersible pumps is shown in the Table 2-10:
Table 2-10
Submersible Pump Capacity Assessment
Peak Day Demand
(L/s)
Item
No.
Description
Licensed
Maximum
Pump
Rate (L/s)
Pump
Capacity
(L/s)
Existing
Future
1
Pump 1 Well # 1
1.21
0.27
2
Pump 2 Well # 2
0.61
0.34
3
Pump 3 Well # 3
0.30
0.24
4
Total
2.12
0.85
0.95
1.58
5
Assessment
Upgrade
Upgrade
*Submersible Pump Peak Day Demand = Peak Day + 10 % (AD)
Based on the above table, the submersible pumps do not have capacity to meet the existing peak
day demand.
County of Minburn No. 27
2 - Water Supply and Distribution
2-16
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The analysis indicates that the existing raw water supply system does not have capacity to meet
peak day demands of the existing population, which will place additional demand on the Hamlet's
water storage reservoir. The County anticipates being supplied with a regional line from Vegreville
within the next two years, which will resolve its raw water supply issues. Meanwhile, we
recommend that the County search for and repair the suspected leak in their water distribution
system to reduce the raw water demand.
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\01.00_Background_Data_Collection\water supply\
summary_2009.xlsFlows
FIGURE 2.3
HISTORIC RAW WATER
SUPPLY TRENDS IN LAVOY
Well Flows and Total Flow
Pump 1 out Sep 1-4
SCADA out Aug 25-30
SCADA Well 1 out Apr 8-12?
Leak in raw water line December 23
Leak Nov 13-15 and drop in reservoir levels
Well 3 not pumping; Demand increased and declining reservoir levels Dec 11-15
(possible leak)
Well 1 and 2 flows fluctuate; decline in reservoir levels (topped up by tanker)
Well 1 and 2 flows fluctuate
Well 1 and 2 flows fluctuate
Well 2 flows fluctuate
Wells 1 and 3 not reporting
Well 3 and plant inflow not reporting
Plant inflow meter not reporting
Plant inflow meter not reporting; well 2 changed from 18 L/min to 8 L/min
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
01-Jan-03
01-Jan-04
31-Dec-04
31-Dec-05
01-Jan-07
01-Jan-08
31-Dec-08
31-Dec-09
Month Ending
Average Flow (m3/day)
Well 1
Well 2
Well 3
Total Flow at Plant (volumetric estimate)
Total Well Flow
Meter Data
Plant Inflow meter
County of Minburn No. 27
2 - Water Supply and Distribution
2-18
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2.3.2
Water Storage Reservoir Assessment
The assessment of water storage is shown on the following table:
Table 2-11
Water Storage Reservoir - Assessment
Storage Volume Required
Item No.
Description
Existing
Capacity
(m3)
Existing
(m3)
Future
(m3)
1
Clearwell No. 1
94.5
2
Reservoir No.2
338.6
Total
Clearwell No. 1 +
Reservoir No.2
433.0
488 minimum
542 recommended
506 minimum
599 recommended
Assessment
Upgrade
Upgrade
Based on the above table the existing storage reservoir does not have sufficient capacity to meet
current design standards for fire storage (Tables 2.7 and 2.8). The existing capacity is about 10%
less than the minimum required by Alberta Environment. An additional capacity of at least 166 m3
would be required to provide the recommended storage capacity for fire flow for a population of 187
people, an increase of about 38% above the present capacity.
As will be demonstrated below, the water distribution system also does not have the capacity to
supply fire flows. However, the County has a system in place to provide the initial attack of a fire in
the same manner as a fire elsewhere in the County. Initially it would be supported with water
supplied from the reservoir. Ultimately, if the reservoir is exhausted or the pipe system fails, water
would be supplied with tanker trucks.
Aside from fire storage, the reservoir has adequate capacity for existing and projected populations
beyond 187 people.
2.3.3
Water Distribution Pumps Assessment
The water distribution pumps should meet peak hour demand. The assessment of the pumps
capacity is shown in the following Table 2.12. Performance curves for these pumps are illustrated
in Figure 2.4.
Head
Distribution Pumps (l/s)
TDH(m)
PMP-1
PMP-2
PMP-1 +
PMP-2
57.3
0
0
0
50.3
1.58
1.58
3.16
45.7
3.15
3.04
6.19
42.4
3.79
3.79
7.58
32.9
4.73
4.73
9.46
23.6
6.31
6.31
12.62
Figure 2.4
WATER TREATMENT PLANT
PUMPS CURVE AND FLOW CAPACITY
Distribution Pumps Performance
0
5
10
15
20
25
30
35
40
45
50
55
60
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Flow (l/s)
Head (m)
PUMP-1 or PUMP-2
PUMP-1 + PUMP-2
9.0 l/s @ 345 kPa psi
345 kPa (50 psi) Existing Operating
Pressure
4.5 l/s @ 345 kPa psi
County of Minburn No. 27
2 - Water Supply and Distribution
2-20
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Table 2-12
Pumping System Capacity Assessment
Peak Hour Demand
(L/s)
Item No.
Description
Pump Capacity
@ 345 kPA
(50 psi)
Existing
Future
1
Lead Pump
4.5
2
Lag Pump
4.5
3
Total Capacity
9.0
1.89
3.16
4
Assessment
OK
OK
The above table shows that the existing pumps can satisfy existing and future peak hour demand.
They are not capable of supply fire flow demands of 73 L/s.
A fire pump would be required to provide fire flow demand.
2.3.4
Water Distribution System Assessment
The water distribution system within the study area was assessed using WaterCAD, an AutoCAD
based modeling software. All the components of the system required to run the model were
entered. These components are:
-
Storage reservoir
-
Pumps
-
Control valves
-
Distribution mains
The system was assessed for following scenarios for the existing conditions and future (based on
the Area Structural Plan):
-
Peak Day
-
Peak Hour
-
Peak Day plus Fire
County of Minburn No. 27
2 - Water Supply and Distribution
2-21
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2.3.4.1
Normal Operating Conditions
Model results show that the existing water system is adequate to meet the peak day and
peak hour demands. However, it can not meet the minimum recommended 50 psi
everywhere in the system. To meet this target would require increasing the set point at the
plant to 55 psi (380 kPa), which could increase the risk of leaks and increased water
usage, and is not recommended until the raw water issues are resolved.
2.3.4.2
Fire Flows
The existing water system does not have the capacity to provide fire flows, mainly due to
the absence of a fire pump and the existing 150 mm diameter pipes. The existing pumps
have a maximum capacity of approximately 10 L/s with an operating pressure of 140 kPa
(20 psi), the minimum recommended in the event of a fire.
Addition of a fire pump, without upgrading the pipe system, would increase the fire flow
capacity to approximately 30 to 50 L/s, depending on location, as shown in Figure 2.5.
Operating pressures would need to be limited to a maximum of 55 psi at the plant and a
minimum of 20 psi at the hydrant.
Upgrading the pipe system, as shown in Figure 2.6, in addition to installation of a fire pump,
would be required to provide the Fire Underwriters' recommended fire flow of 73 L/s.
Based on the current design standards, the minimum recommended pipe diameter in a
water system is 200 mm.
The analysis demonstrates that extensive upgrading of water mains and addition of a fire
pump would be required to provide the fire flow recommended by current standards. The
existing system can supply about 20% of the recommended flow, which could be increased
to about 50% by addition of a fire pump at the plant.
2.3.5
Hydrant Spacing Assessment
Figure 2.7 show that the existing hydrants are providing sufficient coverage for the existing
development. However, their capacity is limited by pump and distribution system capacity as noted
above.
REPORT
3-1
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3
Sanitary Sewer System
3.1
SYSTEM OVERVIEW
The Hamlet of Lavoy sanitary sewer system (Figure 3.1) consists of:
-
Wastewater gravity collection system
-
Stabilization Lagoon Sewage Treatment Facility
3.1.1
Wastewater Gravity Collection System
The wastewater collection system is a network of 200 and 250 mm pipes that is drained by gravity
to the existing lagoon located south of the Hamlet of Lavoy, (Figure 3.1). Record drawings show
the 250 mm pipes to be PVC, but do not indicate the material used for the smaller line pipes.
3.1.2
Stabilization Lagoon Sewage Treatment Facility
Based on the "Record Drawings" provided by the Hamlet of Lavoy, the existing lagoon was
constructed in 1976 and is comprised of a single storage cell. The lagoon has a storage capacity of
21,000 m3 at an operating depth of 1.53 m.
3.2
DESIGN CRITERIA - SANTITARY SEWER SYSTEM
3.2.1
Population
For total population and population densities see Table 2.4.
3.2.2
Domestic (Dry-Weather) Flow
A domestic sanitary sewer contribution of 400 L/c/d will be used. This number includes the
population water consumption plus the backwash water from the Water Treatment Plant, which
discharges into the sanitary sewer system. Sewage flows for the Health Retreat and Spa were
determined from actual water meter records.
3.2.3
Peaking Factor
Harmon's formula will be applied to calculate the Peaking Factor, PF
14
PF
=
1 +
4 + √ p
Where p = population in thousands
3
County of Minburn No. 27
3 - Sanitary Sewer System
3-3
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The peaking factor is limited to a maximum value of 3.8.
3.2.4
Wet Weather Flows (WWF) Infiltration
Based on Alberta Environment guidelines for wastewater system a general allowance of 0.28L/s/ha
should be applied for infiltration flow into pipes and manholes.
In addition, a separate allowance of 0.04 L/s/ha for inflow to manholes located in street sags should
be added and 0.60 L/s/ha where weeping tiles are connected to the sanitary sewer.
3.2.5
Sewage Flow Formula
For gravity sewers the Manning's equation formula will be used to calculate pipefull capacity:
AR 2/3 S1/2
Q
=
n
Q = design flow population in m3/s
A = cross-sectional area in m2
R = hydraulic radius (area/welted perimeter) in m
S = slope of hydraulic grade line in m/m
N = roughness coefficient
Roughness coefficient will be 0.013 for all smooth walled pipes of approved material.
Ideally, sanitary sewers are designed to flow at a maximum depth of 80% of pipe diameter, which
corresponds to a discharge rate of 86% of pipefull capacity, to provide a factor of safety against
surcharging.
3.2.6
Velocity
Velocities for the sanitary sewer system should be as follows:
-
Minimum = 0.6 m/s
-
Maximum = 3.0 m/s
County of Minburn No. 27
3 - Sanitary Sewer System
3-4
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\03.02_Conceptual_Feasibility_Report\rpt_LavoyMtrSrvPln_Final.doc
3.2.7
Stabilization Lagoon Sewage Treatment Facility
The minimum design standards for wastewater lagoons are a function of the average daily design
flow, and are summarized in Table 3.1.
Table 3-1
Wastewater Lagoon Requirements - AEP
Average Daily
Design Flow
(m3/d)
No. of Anaerobic
Cells
(2 days storage)
Requirements for
Facultative Cell(s)
(60 days storage)
Requirements for 12
Months Storage Cell(s)
(365 days storage)
Less than 250
0
Min. Depth = 3.0 m
Yes
Max. Depth = 1.5 m
Yes
Max. Depth = 3.0 m
250 - 500
2
Min. Depth = 3.0 m
Yes
Max. Depth = 1.5 m
Yes
Max. Depth = 3.0 m
Greater than
500
4
Min. Depth = 3.0 m
Yes
Max. Depth = 1.5 m
Yes
Max. Depth = 3.0 m
3.3
SANITARY SEWER SYSTEM - ASSESSMENT
3.3.1
Wastewater Gravity Collection System - Assessment
Table 3.2 provides the calculated peak flows compared with pipe capacity in the existing sewer
system. It shows that the existing sanitary sewer system servicing the Hamlet of Lavoy performs
reasonably well compared with the current design standards. Peak flows are less than pipe
capacity at all locations, even under peak wet weather flow conditions.
Table 3.3 shows the calculated peak flows compared with pipefull capacity after the future area is
fully developed. It shows that the sewer flow is less than pipefull capacity at allocations, but the
factor of safety against surcharging is reduced to about 10% in four pipes. Note that the design
calculations assumed that the existing and future homes would have weeping tiles draining to the
sanitary sewers, which is a conservative assumption.
Therefore, the sanitary sewer collection system has sufficient capacity for both dry weather and wet
weather peak flows for a future population of 187 people.
General
Existing Areas
CLIENT:
County of Minburn No. 27
Per Capita Flow Generation
400 L/c/day
TABLE 3.2
PROJECT
Hamlet of Lavoy-Master Servicing Plan
Peaking Factor
Harmons
PROJECT No.
2009-3779
General Infiltration
0.28 L/s/ha
HAMLET OF LAVOY
DESIGNED BY::
FZ
Sag Manhole
0.05 L/s/ha
SANITARY SEWER ANALYSIS - EXISTING DEVELOPMENT
Foundation Drain
0.60 L/s/ha
SYSTEM HYDRAULIC ANALYSIS -MAY, 2009
Manning's n
Old Pipe
0.015
(EXTRANEOUS=GENERAL INFILTRATION+SAG MANHOLE+FOUNDATION DRAIN)
REVISED BY:
LB
New Pipe
0.013
commercial/industrial
people/home
Residential Density
p/ha
Residential Density
1.7 people/home
From/To Node
Total
Peaking
Manhole
Pipe
Ind/Comm
Infiltration Area
Population
Factor
Residential
Ind/Comm
Domestic
Extraneous
Total
MH Numbers
Invert Elevation
Length
Diameter
Slope
Qcap
86%
Qcap
V
ha
ha
L/s
L/s
L/s
L/s
L/s
Upstream
Downstream
Upstream
Downstream
(m)
(mm)
Type
(%)
(l/s)
(l/s)
(m/s)
(L/s)
%
existing
future
total
(m)
(m)
Mh12-Mh11
0.80
4.00
0.00
4.00
0.00
0.80
7
3.80
0.12
0.000
0.12
0.74
0.86
Mh11
0.80
4.00
0.00
4.00
0.00
0.80
7
3.80
0.12
0.000
0.12
0.74
0.86
Mh 12
Mh11
670.390
669.447
87.32
200.00
PVC
1.08
35.6
30.6
1.13
29.7
97.2
Mh11-Mh10
0.45
0.00
0.00
0.00
0.00
0.45
0
3.80
0.00
0.000
0.00
0.42
0.42
Mh10
1.25
16.00
0.00
16.00
0.00
1.25
27
3.80
0.47
0.000
0.47
1.16
1.63
Mh11
Mh10
669.447
669.030
87.32
200.00
PVC
0.48
23.6
20.3
0.75
18.7
92.0
Mh10-Mh9
7.63
1.00
0.00
1.00
0.00
7.63
2
3.80
0.03
0.000
0.03
7.10
7.13
Mh9
15.83
29.00
0.00
29.00
0.00
15.83
48
3.80
0.85
0.000
0.85
14.72
15.57
Mh10
Mh9
669.030
668.770
87.32
250.00
PVC
0.30
33.9
29.1
0.69
13.5
46.5
Mh9-Mh8
0.68
3.00
0.00
3.00
0.00
0.68
5
3.80
0.09
0.000
0.09
0.63
0.72
Mh8
16.51
32.00
0.00
32.00
0.00
16.51
53
3.80
0.93
0.000
0.93
15.35
16.29
Mh9
Mh8
668.770
668.510
87.32
250.00
PVC
0.30
33.9
29.1
0.69
12.8
44.1
Mh8-Mh7
5.31
18.00
0.00
18.00
0.00
5.31
30
3.80
0.53
0.000
0.53
4.94
5.46
Mh7
26.43
64.00
0.00
64.00
0.00
26.43
106
3.80
1.87
0.000
1.87
24.58
26.45
Mh8
Mh7
668.510
668.247
90.22
250.00
PVC
0.29
33.5
28.8
0.68
2.4
8.2
Mh7-Mh6A
0.69
2.00
0.00
2.00
0.00
0.69
3
3.80
0.06
0.000
0.06
0.64
0.70
Mh6A
27.12
66.00
0.00
66.00
0.00
27.12
110
3.80
1.93
0.000
1.93
25.22
27.15
Mh7
Mh6A
668.247
668.009
82.10
250.00
PVC
0.29
33.4
28.7
0.68
1.6
5.5
Mh6A-Mh6
0.20
0.00
0.00
0.00
0.00
0.20
0
3.80
0.00
0.000
0.00
0.19
0.19
Mh6
27.32
66.00
0.00
66.00
0.00
27.32
110
3.80
1.93
0.000
1.93
25.41
27.34
Mh6A
Mh6
668.009
667.877
44.14
250.00
PVC
0.30
34.0
29.2
0.69
1.9
6.5
Mh6-Mh5
0.63
0.00
0.00
0.00
0.00
0.63
0
3.80
0.00
0.000
0.00
0.59
0.59
Mh5
27.95
66.00
0.00
66.00
0.00
27.95
110
3.80
1.93
0.000
1.93
25.99
27.92
Mh6
Mh5
667.877
667.527
126.49
250.00
PVC
0.28
32.6
28.0
0.66
0.1
0.5
Mh5-Mh4
0.64
0.00
0.00
0.00
0.00
0.64
0
3.80
0.00
0.000
0.00
0.60
0.60
Mh4
28.59
66.00
0.00
66.00
0.00
28.59
110
3.80
1.93
0.000
1.93
26.59
28.52
Mh5
Mh4
667.527
667.146
126.49
250.00
PVC
0.30
34.0
29.3
0.69
0.8
2.6
Mh4-Mh3
0.57
0.00
0.00
0.00
0.00
0.57
0
3.80
0.00
0.000
0.00
0.53
0.53
Mh3
29.16
66.00
0.00
66.00
0.00
29.16
110
3.80
1.93
0.000
1.93
27.12
29.05
Mh4
Mh3
667.146
666.664
115.82
250.00
PVC
0.42
40.0
34.4
0.82
5.4
15.6
Mh3-Mh2
0.29
0.00
0.00
0.00
0.00
0.29
0
3.80
0.00
0.000
0.00
0.27
0.27
Mh2
29.45
66.00
0.00
66.00
0.00
29.45
110
3.80
1.93
0.000
1.93
27.39
29.32
Mh3
Mh2
666.664
666.076
108.21
250.00
PVC
0.54
45.7
39.3
0.93
10.0
25.5
Mh2-Mh1
0.30
0.00
0.00
0.00
0.00
0.30
0
3.80
0.00
0.000
0.00
0.28
0.28
Mh1
29.75
66.00
0.00
66.00
0.00
29.75
110
3.80
1.93
0.000
1.93
27.67
29.59
Mh2
Mh1
666.076
665.654
108.20
250.00
PVC
0.39
38.7
33.3
0.79
3.7
11.2
Mh1-Mh PD-1
0.20
0.00
0.00
0.00
0.00
0.20
0
3.80
0.00
0.000
0.00
0.19
0.19
MhPD-1
29.95
66.00
0.00
66.00
0.00
29.95
110
3.80
1.93
0.000
1.93
27.85
29.78
Mh1
MhPD-1
665.817
665.454
18.13
250.00
PVC
2.00
87.7
75.5
1.79
45.7
60.5
Mh30-Mh29
0.77
2.00
0.00
2.00
0.00
0.77
3
3.80
0.06
0.000
0.06
0.72
0.77
Mh29
0.77
2.00
0.00
2.00
0.00
0.77
3
3.80
0.06
0.000
0.06
0.72
0.77
Mh 12
Mh29
670.390
669.447
87.32
200.00
PVC
1.08
35.6
30.6
1.13
29.8
97.5
Mh29-Mh28
0.42
1.00
0.00
1.00
0.00
0.42
2
3.80
0.03
0.000
0.03
0.39
0.42
Mh28
1.19
3.00
0.00
3.00
0.00
1.19
5
3.80
0.09
0.000
0.09
1.11
1.19
Mh29
Mh28
669.447
669.030
87.32
200.00
PVC
0.48
23.6
20.3
0.75
19.1
94.1
Mh28-Mh23
1.05
3.00
0.00
3.00
0.00
1.05
5
3.80
0.09
0.000
0.09
0.98
1.06
Mh23
2.24
6.00
0.00
6.00
0.00
2.24
10
3.80
0.18
0.000
0.18
2.08
2.26
Mh28
Mh23
669.030
668.770
87.32
250.00
PVC
0.30
33.9
29.1
0.69
26.9
92.2
Mh23-Mh16
2.45
4.00
0.00
4.00
0.00
2.45
7
3.80
0.12
0.000
0.12
2.28
2.40
Mh16
4.69
10.00
0.00
10.00
0.00
4.69
17
3.80
0.29
0.000
0.29
4.36
4.65
Mh23
Mh16
668.770
668.510
87.32
250.00
PVC
0.30
33.9
29.1
0.69
24.5
84.0
Mh16-Mh10
2.26
2.00
0.00
2.00
0.00
2.26
3
3.80
0.06
0.000
0.06
2.10
2.16
Mh10
6.95
12.00
0.00
12.00
0.00
6.95
20
3.80
0.35
0.000
0.35
6.46
6.81
Mh16
Mh10
668.510
668.247
90.22
250.00
PVC
0.29
33.5
28.8
0.68
22.0
76.3
Mh27-Mh26
0.78
0.00
0.00
0.00
0.00
0.78
0
3.80
0.00
0.000
0.00
0.73
0.73
Mh26
0.78
0.00
0.00
0.00
0.00
0.78
0
3.80
0.00
0.000
0.00
0.73
0.73
Mh10
Mh26
668.247
668.009
82.10
250.00
PVC
0.29
33.4
28.7
0.68
28.0
97.5
Mh26-Mh21
0.36
0.00
0.00
0.00
0.00
0.36
0
3.80
0.00
0.000
0.00
0.33
0.33
Mh21
1.14
0.00
0.00
0.00
0.00
1.14
0
3.80
0.00
0.000
0.00
1.06
1.06
Mh26
Mh21
668.009
667.905
44.14
250.00
PVC
0.24
30.1
25.9
0.61
24.8
95.9
Mh21-Mh14
1.53
4.00
0.00
4.00
0.00
1.53
7
3.80
0.12
0.000
0.12
1.42
1.54
Mh14
2.67
4.00
0.00
4.00
0.00
2.67
7
3.80
0.12
0.000
0.12
2.48
2.60
Mh21
Mh14
667.905
667.527
126.49
250.00
PVC
0.30
33.9
29.2
0.69
26.6
91.1
Mh14-Mh8
1.94
10.00
0.00
10.00
0.00
1.94
17
3.80
0.29
0.000
0.29
1.80
2.10
Mh8
4.61
14.00
0.00
14.00
0.00
4.61
23
3.80
0.41
0.000
0.41
4.29
4.70
Mh14
Mh8
667.527
667.146
126.49
250.00
PVC
0.30
34.0
29.3
0.69
24.6
84.0
Spare Capacity
SANITARY SEWER DESIGN CHART
# of homes
Residential
Total Design Flows
Contributing Area (ha)
Design Flow
ASSOCIATED ENGINEERING ALBERTA LTD.
RATIONAL METHOD FOR CIRCULAR PIPE
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\03.04_Civil_Notes_Drawings\San\Exist+Fut. san design rev Mar 2010 c.w weeping tile.xls
General
Existing Areas
CLIENT:
County of Minburn No. 27
Per Capita Flow Generation
400 L/c/day
TABLE 3.3
PROJECT
Hamlet of Lavoy-Master Servicing Plan
Peaking Factor
Harmons
PROJECT No.
2009-3779
General Infiltration
0.28 L/s/ha
HAMLET OF LAVOY
DESIGNED BY::
FZ
Sag Manhole
0.05 L/s/ha
SANITARY SEWER ANALYSIS - FUTURE DEVELOPMENT
Foundation Drain
0.60 L/s/ha
SYSTEM HYDRAULIC ANALYSIS -MAY, 2009
Manning's n
Old Pipe
0.015
(EXTRANEOUS=GENERAL INFILTRATION+SAG MANHOLE+FOUNDATION DRAIN)
REVISED BY:
LB
New Pipe
0.013
commercial/industrial
6.0 people/home
Residential Density
p/ha
Residential Density
1.5 people/home
From/To Node
Total
Peaking
Manhole
Pipe
Ind/Comm
Infiltration Area
Population
Factor
Residential
Ind/Comm
Domestic
Extraneous
Total
MH Numbers
Invert Elevation
Length
Diameter
Slope
Qcap
86%
Qcap
V
ha
ha
L/s
L/s
L/s
L/s
L/s
Upstream
Downstream
Upstream
Downstream
(m)
(mm)
Type
(%)
(l/s)
(l/s)
(m/s)
(L/s)
%
existing
future
total
(m)
(m)
Mh12-Mh11
0.80
4.00
0.00
4.00
0.20
0.80
7
3.80
0.13
0.000
0.13
0.74
0.87
Mh11
0.80
4.00
0.00
4.00
0.20
0.80
7
3.80
0.13
0.000
0.13
0.74
0.87
Mh 12
Mh11
670.390
669.447
87.32
200.00
PVC
1.08
35.6
30.6
1.13
29.7
97.1
Mh11-Mh10
0.45
0.00
0.00
0.00
0.00
0.45
0
3.80
0.00
0.000
0.00
0.42
0.42
Mh10
1.25
14.00
11.00
25.00
0.20
1.25
40
3.80
0.70
0.000
0.70
1.16
1.86
Mh11
Mh10
669.447
669.030
87.32
200.00
PVC
0.48
23.6
20.3
0.75
18.5
90.9
Mh10-Mh9
7.63
1.00
0.00
1.00
0.00
7.63
2
3.80
0.03
0.000
0.03
7.10
7.12
Mh9
15.83
25.00
22.00
47.00
0.20
15.83
106
3.80
1.86
0.000
1.86
14.72
16.58
Mh10
Mh9
669.030
668.770
87.32
250.00
PVC
0.30
33.9
29.1
0.69
12.5
43.0
Mh9-Mh8
0.68
3.00
0.00
3.00
0.00
0.68
5
3.80
0.08
0.000
0.08
0.63
0.71
Mh8
16.51
28.00
22.00
50.00
0.20
16.51
110
3.80
1.94
0.000
1.94
15.35
17.30
Mh9
Mh8
668.770
668.510
87.32
250.00
PVC
0.30
33.9
29.1
0.69
11.8
40.6
Mh8-Mh7
5.31
12.00
0.00
12.00
0.00
5.31
18
3.80
0.32
0.000
0.32
4.94
5.26
Mh7
26.43
48.00
32.00
80.00
0.20
26.43
184
3.80
3.24
0.000
3.24
24.58
27.82
Mh8
Mh7
668.510
668.247
90.22
250.00
PVC
0.29
33.5
28.8
0.68
1.0
3.4
Mh7-Mh6A
0.69
2.00
0.00
2.00
0.00
0.69
3
3.80
0.05
0.000
0.05
0.64
0.70
Mh6A
27.12
50.00
32.00
82.00
0.20
27.12
187
3.80
3.29
0.000
3.29
25.22
28.51
Mh7
Mh6A
668.247
668.009
82.10
250.00
PVC
0.29
33.4
28.7
0.68
0.2
0.7
Mh6A-Mh6
0.20
0.00
0.00
0.00
0.00
0.20
0
3.80
0.00
0.000
0.00
0.19
0.19
Mh6
27.32
50.00
32.00
82.00
0.20
27.32
187
3.80
3.29
0.000
3.29
25.41
28.70
Mh6A
Mh6
668.009
667.877
44.14
250.00
PVC
0.30
34.0
29.2
0.69
0.5
1.8
Mh6-Mh5
0.63
0.00
0.00
0.00
0.00
0.63
0
3.80
0.00
0.000
0.00
0.59
0.59
Mh5
27.95
50.00
32.00
82.00
0.20
27.95
187
3.80
3.29
0.000
3.29
25.99
29.29
Mh6
Mh5
667.877
667.527
126.49
250.00
PVC
0.28
32.6
28.0
0.66
-1.2
-4.4
Mh5-Mh4
0.64
0.00
0.00
0.00
0.00
0.64
0
3.80
0.00
0.000
0.00
0.60
0.60
Mh4
28.59
50.00
32.00
82.00
0.20
28.59
187
3.80
3.29
0.000
3.29
26.59
29.88
Mh5
Mh4
667.527
667.146
126.49
250.00
PVC
0.30
34.0
29.3
0.69
-0.6
-2.0
Mh4-Mh3
0.57
0.00
0.00
0.00
0.00
0.57
0
3.80
0.00
0.000
0.00
0.53
0.53
Mh3
29.16
50.00
32.00
82.00
0.20
29.16
187
3.80
3.29
0.000
3.29
27.12
30.41
Mh4
Mh3
667.146
666.664
115.82
250.00
PVC
0.42
40.0
34.4
0.82
4.0
11.6
Mh3-Mh2
0.29
0.00
0.00
0.00
0.00
0.29
0
3.80
0.00
0.000
0.00
0.27
0.27
Mh2
29.45
50.00
32.00
82.00
0.20
29.45
187
3.80
3.29
0.000
3.29
27.39
30.68
Mh3
Mh2
666.664
666.076
108.21
250.00
PVC
0.54
45.7
39.3
0.93
8.6
22.0
Mh2-Mh1
0.30
0.00
0.00
0.00
0.00
0.30
0
3.80
0.00
0.000
0.00
0.28
0.28
Mh1
29.75
50.00
32.00
82.00
0.20
29.75
187
3.80
3.29
0.000
3.29
27.67
30.96
Mh2
Mh1
666.076
665.654
108.20
250.00
PVC
0.39
38.7
33.3
0.79
2.4
7.1
Mh1-Mh PD-1
0.20
0.00
0.00
0.00
0.00
0.20
0
3.80
0.00
0.000
0.00
0.19
0.19
MhPD-1
29.95
50.00
32.00
82.00
0.20
29.95
187
3.80
3.29
0.000
3.29
27.85
31.15
Mh1
MhPD-1
665.817
665.454
18.13
250.00
PVC
2.00
87.7
75.5
1.79
44.3
58.7
Mh30-Mh29
0.77
2.00
0.00
2.00
0.00
0.77
3
3.80
0.05
0.000
0.05
0.72
0.77
Mh29
0.77
2.00
0.00
2.00
0.00
0.77
3
3.80
0.05
0.000
0.05
0.72
0.77
Mh 12
Mh29
670.390
669.447
87.32
200.00
PVC
1.08
35.6
30.6
1.13
29.8
97.5
Mh29-Mh28
0.42
1.00
4.00
5.00
0.00
0.42
8
3.80
0.14
0.000
0.14
0.39
0.53
Mh28
1.19
3.00
4.00
7.00
0.00
1.19
11
3.80
0.19
0.000
0.19
1.11
1.30
Mh29
Mh28
669.447
669.030
87.32
200.00
PVC
0.48
23.6
20.3
0.75
19.0
93.6
Mh28-Mh23
1.05
3.00
0.00
3.00
0.00
1.05
5
3.80
0.08
0.000
0.08
0.98
1.06
Mh23
2.24
6.00
4.00
10.00
0.00
2.24
15
3.80
0.27
0.000
0.27
2.08
2.35
Mh28
Mh23
669.030
668.770
87.32
250.00
PVC
0.30
33.9
29.1
0.69
26.8
91.9
Mh23-Mh16
2.45
2.00
7.00
9.00
0.00
2.45
14
3.80
0.24
0.000
0.24
2.28
2.52
Mh16
4.69
8.00
11.00
19.00
0.00
4.69
29
3.80
0.51
0.000
0.51
4.36
4.88
Mh23
Mh16
668.770
668.510
87.32
250.00
PVC
0.30
33.9
29.1
0.69
24.2
83.3
Mh16-Mh10
2.26
2.00
0.00
2.00
0.00
2.26
3
3.80
0.05
0.000
0.05
2.10
2.16
Mh10
6.95
10.00
11.00
21.00
0.00
6.95
32
3.80
0.57
0.000
0.57
6.46
7.03
Mh16
Mh10
668.510
668.247
90.22
250.00
PVC
0.29
33.5
28.8
0.68
21.8
75.6
Mh27-Mh26
0.78
0.00
0.00
0.00
0.00
0.78
0
3.80
0.00
0.000
0.00
0.73
0.73
Mh26
0.78
0.00
0.00
0.00
0.00
0.78
0
3.80
0.00
0.000
0.00
0.73
0.73
Mh10
Mh26
668.247
668.009
82.10
250.00
PVC
0.29
33.4
28.7
0.68
28.0
97.5
Mh26-Mh21
0.36
0.00
10.00
10.00
0.00
0.36
15
3.80
0.27
0.000
0.27
0.33
0.61
Mh21
1.14
0.00
10.00
10.00
0.00
1.14
15
3.80
0.27
0.000
0.27
1.06
1.33
Mh26
Mh21
668.009
667.905
44.14
250.00
PVC
0.24
30.1
25.9
0.61
24.6
94.9
Mh21-Mh14
1.53
4.00
0.00
4.00
0.00
1.53
6
3.80
0.11
0.000
0.11
1.42
1.53
Mh14
2.67
4.00
10.00
14.00
0.00
2.67
22
3.80
0.38
0.000
0.38
2.48
2.86
Mh21
Mh14
667.905
667.527
126.49
250.00
PVC
0.30
33.9
29.2
0.69
26.3
90.2
Mh14-Mh8
1.94
4.00
0.00
4.00
0.00
1.94
6
3.80
0.11
0.000
0.11
1.80
1.91
Mh8
4.61
8.00
10.00
18.00
0.00
4.61
28
3.80
0.49
0.000
0.49
4.29
4.77
Mh14
Mh8
667.527
667.146
126.49
250.00
PVC
0.30
34.0
29.3
0.69
24.5
83.7
ASSOCIATED ENGINEERING ALBERTA LTD.
RATIONAL METHOD FOR CIRCULAR PIPE
Spare Capacity
SANITARY SEWER DESIGN CHART
# of homes
Residential
Total Design Flows
Contributing Area (ha)
Design Flow
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\03.04_Civil_Notes_Drawings\San\Exist+Fut. san design rev Mar 2010 c.w weeping tile.xls
County of Minburn No. 27
3 - Sanitary Sewer System
3-7
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\03.02_Conceptual_Feasibility_Report\rpt_LavoyMtrSrvPln_Final.doc
3.3.2
Stabilization Lagoon Sewage Treatment Facility
The assessment of the existing sewage lagoon is provided in the following table.
Table 3-4
Sewage Lagoon Requirements
Existing
Future
Population
112
187
Consumption (L/c/d)
400
400
Average Day Flow (m3)
44.8
74.8
Anaerobic cell
Not required
Not Required
Facultative Cell (m3)
(60 days capacity)
2,688
4,488
Storage Cell (m3)
(365 days capacity)
16,352
27,302
As noted previously, the existing lagoon has one storage cell of 21,000 m3 capacity, which is
sufficient for existing development conditions plus an additional population of 33 people
(approximately 15 new homes), according to present standards. The storage cell would then need
to be expanded to 28,000 m3 for the future population.
A new facultative cell is also required to meet current Alberta Environment standards. It is not clear
when Alberta Environment will require the facultative cell to be added. Typically, these
requirements are assessed on a case by case basis when the municipality's operating licence is
due for renewal. This may not occur until the effluent quality exceeds the limits specified in the
operating licence.
Current design criteria do not require an anaerobic cell at the moment or with future conditions, until
the population exceeds 625 people, which is about six times the current population.
REPORT
4-1
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\03.02_Conceptual_Feasibility_Report\rpt_LavoyMtrSrvPln_Final.doc
4
Cost Estimate
The cost estimates for the upgrades identified above are based on current (2010) industry prices, plus
contingency and engineering.
4.1
WATER DISTRIBUTION SYSTEM
The County is planning to supply water to the Hamlet with a regional line from Vegreville in the near
future. Cost of this line is budgeted elsewhere.
Other upgrades would be required to provide fire protection from the water distribution system. The
County has a fire response plan that does not require upgrading of the water supply system.
4.2
SANITARY SEWER SYSTEM
To satisfy current design criteria for a future population of 187 people, the following upgrades are
required:
Upgrade Existing Sewage Lagoon as follows:
-
Build one facultative cell having a total capacity of 4,800 m3
$100,000
-
Expand the existing storage cell by adding an additional 14,000 m3
$300,000
Total
$400,000
Contingency (25%)
$100,000
Engineering (20%)
$ 80,000
Total
$580,000
The existing cell will provide for a population of 145 people which is 33 more than existing.
4
REPORT
5-1
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\03.02_Conceptual_Feasibility_Report\rpt_LavoyMtrSrvPln_Final.doc
5
Conclusions
5.1
WATER SYSTEM
-
The raw water supply system is currently operating at capacity and should be upgraded or replaced
as soon as possible. Lavoy is to be supplied from a regional line in the near future.
-
There is evidence of a leak in the water distribution system that has increased the water supplied to
the community by about 35% since July 2009.
-
The water distribution system has capacity for only 20% of the fire flow recommended by the Fire
Underwriters. To provide the recommended fire flow capacity would require replacing most of the
existing 150 mm diameter water distribution pipes with 200 mm diameter mains, addition of a fire
pump, and expanding the reservoir, which may not be practical. Instead, the County has a
contingency plan for fire protection similar to that used throughout the County.
-
If fire flows are ignored, the existing reservoir and distribution system have capacity to serve the
future population of 187 people.
5.2
SANITARY SEWER SYSTEM
-
The existing gravity collection system has adequate capacity for the existing and future
development scenarios.
5.3
STABILIZATION LAGOON SEWAGE TREATMENT FACILITY
-
The existing lagoon has sufficient capacity for a population of approximately 145 people, which
allows for an increase of 33 people or 15 homes. Alberta Environment may require addition of a
facultative cell if the effluent quality exceeds the limits specified in the operating licence.
-
To meet Alberta Environment's current standards, and serve a population of 187 people, the
existing lagoon would need to be upgraded by adding one facultative cell having a capacity of
4,888 m3 and expanding the storage cell to 28,000 m3.
-
An anaerobic cell is not required by Alberta Environment until the population reaches 625 people.
5
REPORT
6-1
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\03.02_Conceptual_Feasibility_Report\rpt_LavoyMtrSrvPln_Final.doc
6
Recommendations
Following are the principal recommendations of the Master Services Plans:
6.1
WATER SUPPLY SYSTEM
-
Search for and repair the suspected leak in the water distribution system to reduce the water supply
to the community by about 30%.
-
Supply water from a regional line as soon as possible.
-
Consider increasing the system operating pressure to 55 psi at the water treatment plan once the
regional line is in service.
6.2
SANITARY SEWER SYSTEM
-
Upgrade the sewage lagoon when and as required by Alberta Environment.
6
REPORT
A-1
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\03.02_Conceptual_Feasibility_Report\rpt_LavoyMtrSrvPln_Final.doc
Appendix A - Water Distribution Pumps Curve
A
REPORT
B-1
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\03.02_Conceptual_Feasibility_Report\rpt_LavoyMtrSrvPln_Final.doc
Appendix B - Historical Water Record Data
B
2009
2008
2007
2006
2005
2004
2003
4
49.55
34.55
10.91
15.91
45
47
2
46.36
36.82
36.37
60.45
67
32
27
35.45
32.73
31.82
15.00
65
38
41
41.36
28.64
50.00
46.82
36
36
36
44.55
34.55
38.18
55.00
45
29
38
41.36
37.73
25.00
24.09
45
48
36
34.09
26.36
44.55
41.82
48
33
48
18.18
50.00
32.27
47.27
40
33
21
41.36
28.64
54.09
40.45
49
45
35
50
29.10
3.64
45.91
45
37
44
35
25.00
34.09
36.82
27
31
26
33.64
48.64
49.55
37.27
45
36
33
39.55
50.45
61.36
55.91
43
42
30
54.09
0.00
0.00
28.18
36
37
29
29.55
29.55
39.09
30.45
36
40
40
32.27
48.18
44.55
50.91
42
40
49
38.64
70.45
40.91
43.18
66
32
48
27.27
36.82
20.91
15.00
39
40
49
50.91
2.27
32.73
36.36
45
36
40.45
57.73
43.18
61.82
40
37
44
30.91
48.64
53.18
30.00
30
47
32
36.81
41.36
0.00
31.36
37
39
28
42.73
45.45
47.27
58.64
37
38
44
39.09
27.27
47.73
0.00
40
25
43
49.09
30.91
0.00
54.09
40
39
53
40
51.82
40.45
19.55
35
43
48
33.18
27.73
28.64
50.91
35
38
48
40.45
37.27
36.82
54.09
35
29
42.27
43.64
23.18
15.45
50
47
43
33.63
50.91
44.09
34.09
46
51
50
47.73
0.00
28.18
42.73
50
44
44
42.73
30.00
53.18
59.09
36
52
49
4.09
36.36
7.73
12.73
58
53
50
39.55
29.09
35.45
57.27
45
53
56
47.27
41.82
53.18
31.82
41
41
48
35.45
32.73
46.82
45.45
40
45
4
36.36
39.09
31.36
0.00
35
31
41
30.45
51.82
51.36
42
47
31
37.73
46.82
55.00
30.00
41
42
23
29.09
44.55
49.55
48.18
27
52
53
54.09
34.55
59.55
13.63
40
49
32
40
38.64
0.00
60.45
45
35
40
28.18
46.36
46.36
46.82
44
35
35
27.73
45.00
35.45
51.36
38
43
32
32.27
47.27
40.45
12.27
40
41
24
52.73
41.36
21.36
61.36
47
47
37
32.27
35.45
52.27
35.91
34
35
25
41.82
43.64
33.64
54.09
44
40
38
44.55
35.45
42.73
36.36
41
36
38
40
45.00
18.18
34.09
38
36
27
50
42.27
38.18
40.91
38
31
34
35.91
34.09
21.36
30.00
32
38
34.55
43.64
56.36
45.91
42
30
33.18
22.73
19.55
42.73
21
31.64
56.82
53.64
37.73
49
33
39.09
45.91
31.36
58.18
52
37
35.91
34.09
53.64
55.45
41
29
18.64
54.55
20.45
58.64
43
39
38.64
50.00
53.64
40.00
44
34
33.18
33.64
36.36
45.91
38
39
31.82
46.36
45.91
26.82
44
35
40.45
31.36
54.55
56.36
45
33
29.55
47.73
49.09
18.64
36
40
43.18
41.36
37.27
31.82
43
24
47.73
38.64
39.09
46.82
DAILY FLOW CONSUMPTION (m3/day)
41
35
32.73
46.82
54.55
27.73
44
35
40.45
44.09
54.09
54.55
43
44
40.45
49.55
32.73
24.09
41
30
45.00
54.09
50.00
38.18
43
24
40.45
49.09
47.73
46.82
42
37
41.36
46.82
49.09
55.00
46
39
25.45
53.18
44.09
60.91
41
38
30.91
44.55
51.36
25.91
41
43
25.91
33.64
49.55
30.45
35
30
50
47.73
49.09
57.73
43
30
35.91
45.00
55.00
45.00
46
35
34.09
44.09
53.64
27.73
50
37
35.45
39.55
25.00
35.91
51
37
46.36
42.27
35.00
28.64
37
38
35
42.27
31.82
45.91
45
34
30
44.09
40.91
37.27
49
32
34.09
27.73
40.45
25.00
38
21
44.09
62.73
46.36
38.18
55
35
30.91
40.91
52.27
39.09
36
34
32.73
51.82
45.45
43.64
46
37
24.55
0.00
26.36
35.91
39
38
36.82
26.81
34.55
42.73
46
35
42.73
51.82
43.64
41.36
44
34
20.91
51.36
49.55
45.45
43
33
36.36
42.73
32.73
42.73
36
38
39.55
8.18
38.18
41.81
37
31
27.73
47.27
22.73
40.00
35
44
46.36
45.45
51.36
30.00
40
38
36.36
58.18
35.00
42.73
33
38
38.18
4.55
37.73
17.73
46
21
33.18
48.18
48.64
51.82
37
32.72
40.91
54.55
64.09
34
25
27.27
57.27
30.91
3.18
45
36
36.82
0.91
34.55
35.91
47
27
33.18
50.45
34.55
55.91
48
32
32.27
39.09
40.00
28.18
46
44
29.55
31.82
40.45
57.27
48
38
43.64
36.81
48.18
58.18
35
41
19.09
41.82
49.55
52.73
49
30
43.18
46.36
44.09
45.91
23
46
39.09
44.09
38.64
40.00
45
40
42.27
35.91
40.91
28.18
35
50
32.27
40.45
50.00
40.00
29
34
37.73
42.73
32.27
39.55
32
40
32.73
44.55
36.36
17.73
40
47
32.27
37.73
44.09
59.09
35
35
36.82
36.36
38.64
53.18
37
30
43.64
44.09
37.27
43.18
32
37
50.45
26.36
37.27
28.18
36
42
25
50.45
34.55
40.45
32
33
41.82
53.64
43.18
28.18
42
30
41.81
55
49.09
39.10
29
33
33.18
0.9
50.00
41.36
41
34
33.18
46.82
40.91
25.91
41
35
32.73
25.91
41.36
30.45
33
54
38.64
56.82
1.00
52.27
33
23
32.27
32.73
51.82
49
55
44.10
36.36
32.73
33.64
49
25
40.45
37.27
36.82
31.36
1
51
41
45.45
53.64
50.45
6
25
26
38.18
50.00
52.73
40
37
36
32.73
44.55
31.82
36
43
19.45
41.82
45.91
32.73
40
34
42.73
49.09
48.18
30.00
38
36
19.55
37.73
50.91
54.54
31
36.36
37.73
38.64
4.55
40
29
32.73
50.91
48.64
53.18
40
42
35.45
46.82
49.55
53.18
39
33
32.73
35.91
47.27
39.55
37
46
39.1
49.55
31.82
51.82
35
32
34.09
58.64
30.00
21.36
36
33
34.55
50.91
30.00
43.18
37
38
37.73
22.18
51.82
30.91
32
26
39.09
53.18
24.09
51.36
43
32
26.82
22.27
37.27
50.00
30
21
36.36
58.64
44.55
3.18
42
37
30.45
25.45
48.64
45.91
37
45
27
38.18
31.82
34.55
36
37
31
45.45
30.45
27.27
39
36
29
56.36
39.55
33.64
43
50
38
44.55
47.73
41.82
37
33
30
23.64
37.27
40.45
36
43
30
43.64
41.82
8.64
38
39
29
44.09
48.64
49.55
38
33
44
40.91
47.27
48.63
37
37
30
37.27
43.64
40.45
32
43
30
51.36
46.82
27.73
47
43
34
32.27
36.82
26.82
49
52
35
35
21.36
28.18
49
34
39
59.72
39.09
44.55
49
29
34
0.45
54.55
32.27
49
43
39
50.9
35.45
34.09
28
28
41
35.82
33.18
48.18
37
49
38
38.18
35.00
62.27
39
35
32
42.73
52.27
37.27
39
34
29
47.27
31.36
41.36
33
48
36
34.55
31.82
26.36
34
44
38
33.64
40.45
39.55
40
37
33
40.05
45.45
51.36
39
43
32
51.36
19.09
52.27
29
31
29
28.64
36.36
45.00
40
45
44
50.91
33.18
50.00
39
26
50
42.73
47.27
34.09
42
45
29
25.91
49.55
31.82
44
31
36
32.73
59.55
9.55
43
43
30
45.45
56.82
39.55
32
37
50
55
2.27
49.09
41
40
45
59.55
21.36
49.09
37
31
49
37.73
50.00
49.55
38
43
41
36.82
34.55
50.00
29
39
32
30
17.27
48.64
42
38
40
45.45
31.82
48.18
34
45
36
52.27
49.55
38.18
40
45
23
35.91
17.72
11.36
42
47
36
25
37.73
0.45
37
47
35
47.73
47.27
29.55
39
39
28
42.72
24.55
34.55
33
44
26
34.55
35.00
51.36
36
53
27
49.09
21.36
35.45
68
44
32
40.91
43.18
50.91
40
56
41
47.27
43.18
45.95
38
34
36
31.81
37.73
36.82
33
40
37
45.91
51.36
37
37
38
37.27
46.82
41
42
52.27
41.82
39
38
32.73
9.55
41
27.27
52.73
43
40.91
53.64
43
48.64
0.00
45
46.36
39.09
41
26.82
50.91
36
30.90
54.55
35
35.91
47.28
44
53.64
0.00
43
53.64
51.82
44
53.18
49
0.00
38
52.27
37
30.45
43
17.27
67
68
56
54.09
70.45
61.36
64.09
PD = 70.45/37.49 = 1.88
REPORT
C-1
P:\20093779\00_Lavoy_Hamlet_MSP\Engineering\03.02_Conceptual_Feasibility_Report\rpt_LavoyMtrSrvPln_Final.doc
Appendix C - Model Results
C