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M <br />7] <br />nhnnter4- Best.Management.Practices <br />4.15 TEMPORARY DIVERSION DIKE <br />{ES BMP <br />Defer itton <br />A temporary ridge of compacted soil located at the top or base of a sloping disturbed area. <br />M <br />r Pur__S <br />1. To divert storm runoff from higher drainage areas away from unprotected slopes to <br />a stabilized outlet. <br />m a disturbed area to a sediment trapping <br />2. To divert sediment -laden runoff fro <br />facility. <br />ConditionWhere PracticeAplies <br />to <br />ect <br />or <br />Wherevrsormon r runoff <br />during construct on rr{ These structures ures generallye have aslife <br />retain sediments <br />expectancy of 18 months or less. <br />Planning Considerations <br />r <br />ke isaur ng est blishment of permanent stabilization rlzon slop ngr <br />ed outleto <br />Atemporary diversion <br />a sediment trapping facilityosed slopes <br />disturbed areas. When used at the ed at of a the base of a slope, e, the structure protects <br />structure protects <br />by keeping upland runoff away. <br />adjacent and downstream areas by diverting sediment -laden runoff to a sediment trapping <br />facility. <br />If the dike is going to remain in place for longer than 30 days, it is very important that it be <br />established with temporary or Permanent vegetation. The slope behind the dike is also an <br />important consideration. The dike must have a positive grade to assure drainage, but if the <br />slope is too great, precautions must be taken to prevent erosion due to high velocity flow <br />behind the dike. <br />This practice is considered an economical one because it uses material avThe useful ble on thee <br />site and can usually be constructed with equipment needed for site grading. <br />of the practice can be extended by stabilizing the dike with vegetation. <br />As specified herein, this practice is intended to be temporary. However, with more <br />stringent design criterla, it can be made permanent.in accordance with DIVERSIONS <br />Section 5.18 (ES BMP 1.18). <br />w <br />r <br />W <br />