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Article 6: Development StandgrM <br /> Section 6.15:Soil Erosion and Sedimentation Contro1268F <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 /> (b) Water shall be released from detention ponds into watercourses or <br /> wetlands at a rate and in a manner approximating the natural flow which <br /> would have occurred before development. <br /> (c) Retention and detention ponds shall be designed so that they maintain <br /> their structural integrity when subject to a 100-year storm. <br /> (d) Detention and retention areas shall be designed so that shorelines are <br /> sinuous rather than straight and so that the length of the shoreline is <br /> maximized, thus offering more space for the growth of littoral vegetation. <br /> (e) The banks of detention and retention areas shall slope at a gentle grade <br /> into the water as a safeguard against drowning, personal injury or other <br /> accidents, to encourage the growth of vegetation and to allow the <br /> alternate flooding and exposure of the areas along the shoreline as water <br /> levels periodically rise and fall. <br /> (11) Open Space <br /> (a) The use of drainage facilities and vegetated buffer zones as open space, <br /> recreation, and conservation areas shall be encouraged. <br /> (b) Recreational activities undertaken in these open space areas shall be <br /> limited to passive or leisure activities. <br /> (12) Grassed Swales <br /> (a) Drainage within the development shall be accommodated by the natural <br /> drainage systems whenever possible. <br /> (b) The use of grassed drainageways to channel Wgtarstormwater runoff <br /> shall be encouraged. <br /> (c) The velocity of stormwater runoff travel in this grassed Swale shall range <br /> between 2-4 feet/second. <br /> Orange County, North Carolina— Unified Development Ordinance Page 6-131 <br />