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STORMWATER MANAGEMENT PLAN (SWMP) <br />AND EROSION AND SEDIMENT CONTROL REPORT <br />FOR <br />ST. VRAIN LAKE GRADING IMPROVEMENT PLANS <br />Page 11 <br />• Sediment Control logs are linear barriers of tightly wrapped straw <br />or soil wrapped in filter fabric that are installed to slow runoff velocity <br />and inhibit movement of sediment down the slope. <br />• Outlet protection placed directly below an ouffall from a pipe, <br />interceptor dike, Swale, channel or other storm drain consists of <br />stone, riprap, concrete, or paved aprons. These structures reduce <br />the velocity of concentrated stormwater flows and minimize erosion <br />and scour. They are used for both temporary and permanent <br />BMPs. <br />• Check dams are small, temporary dams of rock, sandbags, or other <br />material and slow runoff velocity and promote sedimentation. They <br />are used in swales and channels to reduce the velocity of <br />concentrated stormwater flows, thus allowing sediments to settle <br />and minimizing down slope erosion and scour. Check dams may <br />serve as both temporary and permanent BMPs. <br />• Temporary Sedimentation Basin is a sedimentation basin that <br />acts as a sediment entrapment facility with a water quality control <br />structure. The basin traps sediment suspended in storm runoff, <br />prevents any offsite transport of soil, and allows storm flows to <br />continue downstream. <br />Silt Fence is a woven synthetic material that can be placed as a <br />temporary barrier along the contour at the base of a disturbed area <br />to filter sediment from runoff. <br />• Diversion Dikes are placed wherever there is a sharp turn in the <br />runoff flow pattern, such as tee-intersections. The dikes force the <br />runoff to follow the intended path, and prevent erosion and the <br />formation of unwanted swales. <br />2. Non-Structural Practices <br />Non-structural practices may include temporary seeding, permanent <br />seeding, mulching, geotextiles, sod stabilization, vegetative buffer <br />