Agenda - 08-23-1993 - C 1-4 - Laserfiche WebLink

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HIGH DENSITY AND LOW DENSITY OPTIONS Any WS-II or WS-III watershed which allows residential densities and impervious surface greater than that specified under the low-density option is considered a high-density watershed. A WS-II or WS-III watershed which does not allow residential density and/or impervious surface to exceed those amounts is considered a low-density watershed. The distinction is important because it relates directly to impervious surface limits which will apply to non-residential development within that watershed, and-the use-of structural-stormwater- - — -- - controls (detention ponds). All of the watershed within Orange County's jurisdiction are considered low-density watersheds with the exception of the Upper Eno. The Upper Eno is considered a.high-density watershed because of the higher residential densities allowed in the Transition Area in Efland. High- density residential projects, and non-residential developments which exceed 6% impervious surface in the Critical Area and 12% in the remainder of the Upper Eno watershed will require construction of detention ponds. NON-RESIDENTIAL DEVELOPMENT Impervious surface limits for non-residential development are indicated in the fifth column (labeled "W/Stormwater, High Den. Option"). Detention ponds are required if impervious surface is within the range listed, EXCEPT where the "5%/70% provision" applies. 5%/70% PROVISION Up to 5% of the area within a Low-Density WS-II or WS-III watershed can be developed for non-residential use with impervious surface as high as 70%, without the use of detention ponds. STORMWATER CONTROLS A detention pond is the only structural stormwater control which can be used to satisfy the State Mandate. Design standards for detention ponds are proposed to be contained in an Appendix to the Zoning Ordinance. The County is ultimately responsible for assuring that the ponds are properly constructed and maintained.