8.3
KCC 12.28.010 allows the director to require drainage improvements in excess of those required in other sections of Title 12 KCC in order to mitigate or eliminate potential drainage-related impacts within critical drainage areas. For particularly sensitive drainage areas, the director may specify the type of drainage analyses and mitigation required.
Figure II-8.1. Critical Drainage Areas Commissioner District 1.
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Figure II-8.2. Critical Drainage Areas Commissioner District 2.
Figure II-8.3. Critical Drainage Areas Commissioner District 3.
Drainage areas defined as critical often have more than one characteristic feature (e.g., steep unstable slopes along a shoreline or flanking a stream). The major stormwater management objective in nearly all cases is to mimic as closely as possible the natural (pre-development) hydrologic conditions to protect both environmental receptors and human life and property.
Development within critical drainage areas requires the appropriate specialist within the specific field to provide recommendations and design for mitigation. In slope or stability-related critical areas, a qualified geotechnical consultant shall make specific drainage mitigation recommendations. Where required, a professional engineer shall incorporate the recommendations into the stormwater management designs.
In wetlands, streams and shoreline critical areas, a qualified habitat biologist shall make specific mitigation recommendations. Where required, a professional engineer shall incorporate the recommendations into the stormwater management designs.
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