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18 <br />B. Alteration of Watercourses -natural watercourses shall not be dredged, <br />cleared of vegetation, deepened, widened, straightened, stabilized or <br />otherwise altered except in accordance with an approved erosion control <br />plan, Water shall be retained or detained before it enters any natural <br />watercourse in order to preserve the natural hydro-dynamics of the <br />watercourse and to prevent sedimentation. <br />C. Limit Land-Disturbing Activity -the area of disturbance by development <br />shall be as small as practical. <br />D. Land Alterations - no grading, cutting or filling shall be commenced until <br />erosion and sedimentation control devices have been installed between <br />the, disturbed area and water bodies, watercourses, wetlands, or adjoining <br />properties. <br />E. Wetland Protection -wetlands and, other water bodies shall not be used <br />as sediment traps during development. <br />F. Maintenance Requirements and Responsibility -erosion and <br />sedimentation facilities shall receive regular maintenance to ensure that <br />they continue to function properly. Temporary basins shall be cleaned out <br />when they are filled to fifty (50) percent of their design capacity. <br />G. Artificial Watercourses -any artificial watercourse (where the need is <br />demonstrated) shall be designed considering soil type so that the velocity <br />of flow is low enough to prevent accelerated erosion. <br />H. Buffer Area Requirements -soil and pollutants carried overland, <br />primarily from roads, trails;. and/ar land-disturbing activities, can be <br />effectively trapped by leaving a relatively undisturbed strip of vegetation <br />parallel and adjacent to the watercourse. Properly managed overland <br />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 <br />will settle out as a result of this slowing and dispersion process. The width <br />of these buffer areas shall depend on the type of stream or drainage area. <br />The width of the buffer strips shall be as follows: <br />1. Creeks and tributaries - (i.e., permanent streams flowing directly <br />into University Lake,_Cane Creek,,a,nd Upper Eno Protected <br />Watershed Areas and permanent streams flowing into such <br />streams). Measure along'a line running perpendicular to the <br />edge of the floodplain (or if na floodplain has been demarcated, <br />the center of the stream) fifty feet from the edge of the floodplain <br />(or if no flood plain has been demarcated from the edge of the <br />water) plus an additional distance equal to: <br />