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Article 6: Development Standards 113 <br /> Section 6.15: Soil Erosion and Sedimentation Control245F <br /> b. If no floodplain has been demarcated, measure along a <br /> line running perpendicular to the center of the <br /> watercourse. Measure the 50 feet from the edge of the <br /> water. <br /> C. "Slope" is expressed as a percentage derived by dividing <br /> the rise in elevation between the floodplain boundary line <br /> (or centerline of the watercourse per above) and a point <br /> 100 feet from that point along the above described <br /> perpendicular line, by 100. <br /> (ii) Intermittent streams flowing into creeks and tributaries. <br /> a. Measure along a line running perpendicular to the <br /> centerline of the intermittent stream 50 feet from such <br /> stream centerline. <br /> (iii) Intermittent streams flowing directly into water supply reservoirs <br /> within University Lake, Cane Creek, and Upper Eno Watersheds. <br /> a. Measure along a line running perpendicular to the <br /> centerline of the intermittent stream 100 feet from such <br /> stream centerline. <br /> (iv) Intermittent streams flowing into streams which flow directly into <br /> water supply reservoirs within University Lake, Cane Creek, and <br /> Upper Eno Watersheds. <br /> a. Measure along a line running perpendicular to the <br /> centerline of the intermittent stream 50 feet from such <br /> stream centerlines. <br /> (v) Water supply reservoirs within University Lake, Cane Creek, and <br /> Upper Eno Watersheds. <br /> a. Measure along a line running perpendicular to the high <br /> water mark or floodplain boundary(whichever is farther <br /> from the Lake) 100 feet from such high water mark or <br /> floodplain boundary plus an additional distance equal to: <br /> 4 x slope x 100 <br /> b. "Slope" is expressed as a percentage derived by dividing <br /> the rise in elevation between the high water line of the <br /> Lake and a point 100 feet from that point along the <br /> above described perpendicular line, by 100. <br /> (d) The existing natural vegetation in the designated buffer areas shall not <br /> be disturbed in any way that would reduce the area's effectiveness in <br /> achieving the objectives set forth in this subsection. <br /> (e) Buffer areas from which the vegetative cover has been removed shall be <br /> planted or otherwise provided with ground cover devices or structures <br /> sufficient to allow the buffer area to accomplish the objectives set forth in <br /> this subsection. <br /> (f) Buffers shall not be used as temporary erosion control devices during <br /> construction. <br /> (9) Sediment Storage <br /> (a) Sediment shall be retained on the site of the development. <br /> (10) Detention or Retention Areas- <br /> (a) Retention and detention ponds may be used to retain and detain the <br /> increased and accelerated stormwater runoff which the development <br /> generates. <br /> Orange County, North Carolina—Unified Development Ordinance Page 6-130 <br />