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WCEL
> Issues > Urban Growth and
Development > Smart Bylaws Guide > Part
2 > Integrated Stormwater Management >
Saanich
Smart Bylaws Guide – Water Balance Model – Saanich
Due to impacts on streams (one-third of Saanich is drained by the
salmon-bearing Colquitz River), the District of Saanich is committed
to no net increase in post-development stormwater flows from
pre-development quantities. The District requires different
types of stormwater management depending on the characteristics of
the receiving watershed.
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3.5 Storm Drains
3.5.1 General Principles
3.5.1.1 The
Municipality requires that all developments provide drainage
structures that will:
- reduce the rate of post development site
runoff to predevelopment levels,
- improve the quality of site drainage
water; and
- minimize erosion and retain sediments.
The Municipality is open to consideration
of site specific drainage solutions
brought forward by the Applicant, designed
by the Consulting Engineer.
District
of Saanich Engineering Specifications (Schedule H, Subdivision
Bylaw No. 7452, February 2004)
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For example, in 1998 Council approved the Sayward Gravel Pit
development (the redevelopment of a gravel pit for residential use),
less than a kilometre from the ocean. The municipality required
surface stormwater collection that is directed to a pond. The
surface pond is designed as a community amenity and will be used to
water the adjacent golf course. No stormwater from the old gravel
pit, streets, or houses will flow into the ocean, and the golf
course can rely on a recycled source for part of its watering needs.
The Christmas Hill area in Saanich is located at the height of
two watersheds. Stormwater flows south into Swan Lake and north
through Rithets Bog, with both systems reaching the Colquitz River.
The Christmas Hill development incorporated on- and off-site
stormwater detention in the form of two ponds. Runoff treatment
techniques included engineered wetlands (using an existing wetland
supporting cattails) and grassy swales.
For More Information
District
of Saanich Engineering Specifications (Schedule H, Subdivision
Bylaw No. 7452, February 2004 (Section 3.5 p.23 and Sections 3.5.6
to 3.5.16.8 pp.28-31)
The following case studies are examples of the Saanich approach
to integrated stormwater management:
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