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WCEL
> Issues > Urban Growth and
Development > Smart Bylaws Guide > Part
2 > Integrated Stormwater Management >
Kelowna
Smart Bylaws Guide – Kelowna
The City of Kelowna is committed to extending
storm drainage systems using best management practices as outlined
in the City’s Stormwater Policy and Design Manual.
The City has used a variety of stormwater
management techniques, such as in-line wetland systems and
stormceptors. For example, the one hectare Valley Glen wetland
was dedicated to the city as greenspace/park area when a 150-unit
development was approved. In 1996, construction of the in-line
wetland, designed to address water quality issues before the
stormwater is released into a creek, cost the City $50,000 to design
and $100,000 to construct.
The City worked with the Rotary Club and Forest
Renewal B.C. to create a one hectare wetland at the mouth of
Brandt’s Creek on land owned by the City. The wetland, called
Rotary Marsh, was restored and replanted, and is designed to filter
sediment and provide wildlife habitat.
See links to both the Official Community Plan
and Subdivision and Development Services Bylaw below.
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13. Services and Utilities
Policies
.1
Design. Require new drainage infrastructure to be
implemented according to the Storm Water Management Design Manual
utilizing Best Management Practices that are appropriate for
Kelowna’s conditions including the use of the natural
environment for the conveyance and treatment of stormwater.
.9 Natural
Wetlands. Support the retention or enhancement of existing
natural wetlands in areas to provide stormwater management and
water quality improvements;
.10 Surface
Drainage and Detention Areas as Amenity Space. Encourage the
utilization of surface drainage systems as amenity/open space
corridors and also consider the use of open space/parks for stormwater detention areas and conveyance corridors.
.12 Urban
Run-off Impacts. Require the mitigation of urban run-off
impacts through the effective use of stormwater detention and
treatment facilities prior to discharging to receiving waters.
Kelowna
Official Community Plan Services & Utilities Policies 13.1
(p.13-1) 2002
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Groundwater Recharge Systems
To promote interception of pollutants and reduction in
downstream impacts, groundwater recharge systems must be utilized
to the maximum extent possible as determined by a qualified
professional experienced in this field. Mains may be sized
according to the required capacity taking 50% or the groundwater
recharge capability into consideration. The groundwater recharge
component must be calculated and justified by a qualified
hydrogeologist/engineer experienced in this field. Minimum sizes
of mains must still be utilized.
* * *
Roof Leaders
Roof drainage leaders are to be connected to the storm service
connection only where geotechnical requirements dictate the need.
The evaluation of this requirement is to be included in the
scope of the Hydrogeotechnical Study. Otherwise, roof leaders are
to be directed to a splash pad for dispersal to the ground. Roof
leaders shall not be directed onto driveways which drain directly
onto city right-of-way or areas draining directly onto
neighbouring
properties.
* * *
Water Quality Treatment
Water quality treatment is required for frequently occurring
events. All flows up to 50% of the 2-year (1 hour duration)
post-development flow must be routed through some form of water
quality treatment facility utilizing “best management
practices” to remove suspended solids and floatables. The
facility can be an in-ground structure which passes flow through
or an above ground facility such as a treatment wetland. Wetlands
can be incorporated into larger stormwater management facilities
for the attenuation of large events. Allowable discharge criteria
are identified in the City of Kelowna Sanitary Sewer/Storm Drain
Regulation Bylaw number 6618-90. Any form of water quality
treatment must be designed to allow for future maintenance
activities associated with the removal of the collected material
and access to incoming and/or outgoing piping.
Subdivision
and Development Services Bylaw 7900, Schedule 4 Design Standards
(Drainage begins on p.26)
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For More Information
Alan Newcombe, (250) 763-6011 extension 326, anewcombe@city.kelowna.bc.ca
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