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ement. Practicesfor_ Erosionand . Se <br /> Chapter 4 - Best. MarradimentControl <br /> 415 TEMPORARY DIVERSION DIKE <br /> {ES BMP 1 . 15) <br /> Defer icon <br /> A temporary ridge of compacted soil located at the top or base of a sloping disturbed area. <br /> r <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 /> Wherever <br /> storms on r ru during construcnoff must be t on rr{ These structures urets generally e have aslife <br /> retain se <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 ifthe <br /> cautions must be taken to prevent erosion due to high ve <br /> slope is too great, prelocity flow <br /> behind the dike. <br /> This practice is considered an economical one because it uses material avThe ble on useful l 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 /> 4-55 <br />