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Chapter 4 Best Mana ement. Practices for Erosion and Sediment Control <br /> 4.16 TEMPORARY FILL DIVERSION <br /> (ES BMP 1 . 16) <br /> Definition <br /> r A channel with a supporting ridge on the lower side cut along 'he top of an active earth fill . <br /> r Purpose <br /> To divert storm runoff away from the unprotected slope of the fill to a stabilized outlet or <br /> �s sediment trapping facility <br /> Conditions Where Practice Applies <br /> Where the drainage area at the top of an active earth fill slopes toward the exposed slope <br /> and where continuous fill operations make the use of a DIVERSION - Section 5. 18 (ES <br /> ,. BMP 1 . 18.) unfeasible . This temporary structure should remain in place for less than one <br /> week. <br /> ,. Planning Considerations. . <br /> One importantprinciple of erosion and sediment control is to keep stormwater runoff away <br /> ,. from exposed- slopes. This. is often accomplished by installing a dike, diversion or paved <br /> ditch at the fop of a slope to cavy the runoff away from the slope to a stabilized outlet or <br /> downdrain . In general ; these measures are installed .atter the final grade has been <br /> the beginning since the work <br /> reached . On cuts , the measures may be installed at <br /> proceeds from the top and the measures have little chance of being covered or damaged . <br /> On fills , the work proceeds from the bottom.to the top and the elevation changes daily. It is <br /> w therefore not feasible to construct a compacted dike or permanent diversion which may be <br /> covered by the next day' s activity . <br /> ,F The temporary fill diversion is intended to provide some slope protection on a daily basis <br /> until final elevations are reached and a more permanent measure can be constructed . <br /> This practice can be constructed by the use of a motor grader or one of the smaller dozers. <br /> ,. To shape the diversion , the piece of machinery used may run near the edge of the fill with <br /> its blade tilted to form the channel as described in Plate 4 . 16a . This work should be done <br /> at the end of the working day and shouldt <br /> provide aacchannel with a berm on the lower side <br /> sloped to direct <br /> . , to protect the slope . Wherever possible , temporaryeversion should <br /> water to a stabilized outlet. if the runoff is diverted over the fill itself, the practice may <br /> cause more problems than it solves by concentrating water at a single point. <br /> 4-59 <br />