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Orange County SE & SC Ordinance eptembe. ' , ,'nn'september 12 20h6 <br />Artificial Watercourses - any artificial watercourse (where the need is demonstrated) <br />shall be designed considering soil type so that the velocity of flow is low enough to <br />prevent accelerated erosion. <br />Buffer Area Requirements - soil and pollutants carried overland, primarily from roads, <br />trails, and/or land- disturbing activities, can be effectively trapped by leaving a relatively <br />undisturbed strip of vegetation parallel and adjacent to the watercourse. Properly managed <br />overland water flow can be directed into this buffer area in a manner that will reduce <br />velocity and cause dispersion of the water. Sediments carried by the water will settle out <br />as a result of this slowing and dispersion process. The width of these buffer areas shall <br />depend on the type of stream or drainage area. The width of the buffer strips shall be as <br />follows: <br />1. Creeks and tributaries - (i.e., permanent streams flowing directly into a <br />water supply reservoir within University Lake, Cane Creek, and Upper <br />Eno Watersheds and permanent streams flowing into such streams). <br />Measure along a line running perpendicular to the edge of the floodplain <br />(or if no floodplain has been demarcated, the center of the stream) fifty <br />feet from the edge of the floodplain (or if no flood plain has been <br />demarcated from the edge of the water) plus an additional distance equal <br />to: <br />4 x slope x 100 <br />where "slope" is expressed as a percentage derived by dividing by 100 the <br />rise in elevation between the floodplain boundary line (or if no floodplain <br />has been demarcated, the centerline of the watercourse) and a point one <br />hundred feet from that point along the above described perpendicular line. <br />2. Intermittent streams flowing into creeks and tributaries. Measure along a <br />line running perpendicular to the centerline of the intermittent stream fifty <br />feet from such stream centerline. <br />3. Intermittent streams flowing directly into water supply reservoirs within <br />University Lake, Cane Creek, and Upper Eno Watersheds. Measure along <br />a line running perpendicular to the centerline of the intermittent stream <br />one hundred feet from such stream centerline. <br />4. Intermittent streams flowing into streams which flow directly into water <br />supply reservoirs within University Lake, Cane Creek, and Upper Eno <br />Watersheds. Measure along a line dinning perpendicular to the centerline <br />of the intermittent stream fifty feet from such stream centerlines. <br />5. Water supply reservoirs within University Lake, Cane Creek, and Upper <br />Eno Watersheds. Measure along a line running perpendicular to the high <br />water mark or floodplain boundary (whichever is farther from the Lake) <br />one hundred feet from such high water mark or floodplain boundary <br />(whichever is farther from the Lake) plus an additional distance equal to: <br />17 <br />