smiths lake planning study volume 1: text - Great Lakes Council

STORMWATER MANAGEMENT 36
4.4 Recommended Stormwater Best Planning Practices
Definition and description of BPP’s can be difficult, and often overlaps somewhat with the
more straightforward definition of BMP’s. The relevant overall site and planning principles
recommended by this study for areas draining to both Wallis and Smiths Lakes are as follows.
4.4.1 Protect all existing waterways
Nearly all of the waterways/creeks in the study area are in a near-pristine condition due to the
low density of existing urban development and lack of previous broad land clearing (Figure 4.3
and Figure 4.4). Preservation and use of these waterways as sympathetic drainage corridors to
Wallis and Smiths Lakes is recommended via the following actions:
• Allow no development or significant disturbance within 30m of the centerline of existing
waterways. This buffer area will:
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protect stream banks from erosion;
filter runoff before it enters the stream; and
encourage stormwater infiltration
• Ensure careful design and construction of any waterway crossings.
• Ensure that where concentrated stormwater is directed ‘into’ these buffers, that appropriate
measures (eg. level spreaders) are used to distribute flow, preventing gully type erosion.
Figure 4-3 Existing SLVA Waterway Corridors
SMITHS_LAKE_PLANNING_STUDY.DOC
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