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one (1) inch of stormwater runoff from <br /> impervious surfaces. The maximum permitted <br /> impervious coverage shall not exceed 40% . <br /> F. i i •Tc ?Tl4 mini O ••F.+ 1 - - f ir°m4" " - — In order <br /> to prevent damage to water quality that is not necessarily <br /> attributed to an individual lot within a development it is <br /> necessary to impose additional requirements on development <br /> in the Critical Watershed District. The purpose of runoff <br /> control measures is to reduce the offsite effects by <br /> minimizing clearing, compaction, and overall site disturb- <br /> . ante, while maximizing vegetated areas for stormwater <br /> infiltration. In order of preference, stormwater control <br /> measures include: <br /> a. Onsite infiltration through undisturbed <br /> vegetated areas; <br /> • b. Structural, or engineered infiltration <br /> ,, measures such as trenches or retention ponds <br /> that reduce the total amount of runoff; <br /> c. Detention structures that reduce the rate, <br /> but not the total amount, of runoff; <br /> 1.%13�ar f�11?l t <br /> C-417.4^ 1 4,-mm <br /> a. c- ^""w==,r } - - For all new development, <br /> measures shall be employed to infiltrate or retain <br /> the first one-half ( 1/2) inch of stormwater runoff <br /> from impervious surfaces during a storm occurring <br /> • within a twenty-four (24) hour period. <br /> b . 1=3. ?:=e" - For all perennial streams indicated <br /> by a solid blue line on the USGS topographic maps a <br /> one-hundred (100 ) foot vegetated buffer shall <br /> be maintained on both sides of the stream bank. <br /> For all areas designated as floodplain in <br /> Unincorporated Areas of Durham County on Flood <br /> Boundary and Floodway Map -by ..the Federal Insurance ___; _ <br /> Administration of the Department of Housing and <br /> Urban Development, a one-hundred (100 ) foot <br /> vegetative buffer shall be maintained on both sides <br /> of the stream bank. <br /> Street crossings, utility lines, recreational and <br /> greenway facilitifemannials to <br /> • <br /> the .vegetative buffer requirements in pere <br /> stream buffer areas and floodplains. <br /> j 7 <br />