Orange County NC Website
Browse       Search
121 <br /> 1. Residential Development <br /> DISTRICT IMPERVIOUS SURFACE/DETENTION POND <br /> REQUIREMENTS <br /> (RESIDENTIAL) <br /> UNIV-CA Lots created prior to Lot Size Impervious Lot Size Impervious <br /> UNIV-PW April 2, 1990 (Acres) Surface (Acres) Surface <br /> 6.0 + 4.0% 2.0 12.0% <br /> 5.0 6.0% 1.0 14.0% <br /> 4.0 8.0% 0.8 14.4% <br /> 3.0 10.0% 0.5 15.0% <br /> The impervious surface ratios (ISR)for fractional <br /> acreage values between 5 acres and 0.5 acres which <br /> are not included in the table above shall be <br /> interpolated. For each 1/10 (.10) acre increase in lot <br /> size, the ISR shall decrease by 2/10 (.20)percent. <br /> Detention ponds (BMPs) are not required. <br /> Lots created after 6% impervious surface limit, with no BMPs required. <br /> April 2, 1990 <br /> CANE-CA 6% impervious surface limit OR 2 acre minimum lot <br /> U-ENO-CA size. BMPs are not required. <br /> LITTLE-PW <br /> FLAT-PW <br /> CANE-PW 12% impervious surface limit OR 1 acre minimum lot <br /> HYCO-PW size. BMPs are not required. <br /> U-ENO-PW 30% impervious surface limit, with BMPs required if <br /> impervious surface exceeds 12%. <br /> L-ENO-PW . _ 50% impervious surface limit, with BMPs required <br /> when: <br /> a) curb and gutter is not used, and density exceeds <br /> 3 du/acre AND impervious surface exceeds <br /> 36%; OR <br /> b) curb and gutter is used, and density exceeds 2 <br /> du/acre AND impervious surface exceeds 24%. <br /> 5 <br />