Laserfiche WebLink
Florida Erosion and Sediment Control Inspector's Manual <br /> 4 . 15 TEMPORARY DIVERSION DIKE <br /> ( ES BMP 1 . 15 ) <br /> Definition •� <br /> A temporary ridge of compacted soil located at the top or base of a sloping disturbed area . <br /> .r <br /> Purposes <br /> 1 . To divert storm runoff from higher drainage areas away from unprotected slopes <br /> to a stabilized outlet . <br /> 2 . To divert sediment-laden runoff from a disturbed area to a sediment trapping <br /> facility. <br /> Condition Where Practice Applies <br /> Wherever stormwater runoff must be temporarily diverted to protect disturbed slopes or retain <br /> sediments on site during construction . These structures generally have a life expectancy of <br /> 18 months or less . <br /> Planning Considerations <br /> A temporary diversion dike is intended to divert overland sheet flow to a stabilized outlet or <br /> a sediment trapping facility during establishment of permanent stabilization on sloping , ' <br /> disturbed areas . When used at the top of a slope , the structure protects exposed slopes by <br /> keeping upland runoff away. When used at the base of a slope , the structure protects adjacent <br /> and downstream areas by diverting sediment-laden runoff to a sediment trapping 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 available on the site .. <br /> and can usually be constructed with equipment needed for site grading . The useful life of the <br /> practice can be extended by stabilizing the dike with vegetation . <br /> As specified herein , this practice is intended to be temporary . However, with more stringent <br /> design criteria , it can be made permanent in accordance with DIVERSIONS - Section 5 . 18 <br /> ( ES BMP 1 . 18 ) . <br /> .r <br /> 4-56 <br />