2006-06-27_PWETC_AgendaPacket - Laserfiche WebLink

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(d) Minimize connectivity of impervious surfaces to the stormwater system. (e) Require the use of effective non-point source pollution reduction BMPs in development projects. (f) Protect and maintain downstream drainage systems to provide permanent and safe conveyance of stormwater. Reduce the frequency and/or duration of potential downstream flooding. (g) Reduce the total volume of stormwater runoff to protect surface water quality and provide recharge to groundwater. (h) Remove sediment, pollutants, and nutrients from stormwater to protect surface water quality. 2. REGULATION. No person or political subd. .sion shall commence a land disturbing activity or the development oflan e acre or greater, unless specifically exempted by Paragraph 5 belo ut first obtaining a permit from the District that incorporates and a oves a water management plan for the activity or development. (b) RUNOFF RA rates for the proposed activity shall not exceed existing runoff r for 2-year, 10-year, and 100-year critical storm events, and runoff r ay be restricted to less than the existing rates when the capacity of downstream conveyance systems is limited. must comply with the following 3. CRITERIA. criteria: (a) HYDROGRAPH MET hydrologic theory sh flows and water levels. drograph method based on sound alyze runoff for the design or analysis of (c) RUNOFF VOLUME -- Stormwater runoff volume reduction shall be achieved onsite in the amount of one inch of runoff from the impervious surfaces of the development. The required stormwater runoff volume reduction shall be calculated as follows: Required Volume (ft3) = Impervious surfaces (rr) * 0.90 (in) * 1/12 (Win) (1) When using infiltration for volume reduction, the following requirements must be met: 06/12/2006 CRWD DRAFT 12