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Chapter 4 Best Management Practices forErosion and Sediment Cantro( <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 the 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 />Gonditians 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 imp ortantprincipIs 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 top of a slope to cant' the runoff away from the slope to a stabilized outlet or <br />downdrain. In general; tfiese measures are installed .after the final grade has been <br />reached. On cuts, the measures may be installed at the beginning since the work <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.ta 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 shouldtprovide acchannel with a berm o sloped to d sect <br />., the lower side <br />to protect the slope. Wherever possible, the temporary <br />version 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 />M <br />so <br />4-59 <br />