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AW <br /> Chapter 4,: -, Best Man agement. Practices_for Erosion and Sediment. Control <br /> • <br /> 4. 17 TEMPORARY RIGHT-OF-WAY DIVERSION <br /> • (ES BMP 1 . 17 ) <br /> Definition <br /> • A ridge of compacted soil or loose rock or gravel constructed across disturbed <br /> rights-of-way and similar sloping areas. <br /> Purpose <br /> �. To shorten the flow length within a long sloping right-of-way, thereby reducing the erosion <br /> potential by diverting storm runoff to a stabilized outlet or sediment trapping device . <br /> r Conditions Where Practice Apniles: . <br /> Generally, earthen diversions are- applicable where there will be little or no construction <br /> • traffic within the right-of-way . Gravel structures are. more ap"piicable to roads and other <br /> rights-of-way which accommodate vehicular traffic: <br /> • Planning Considerations <br /> Construction of utility lines and : roads often requires the clearing of long strips of <br /> .. right-of-way over sloping terrain . The volume . and velocity of stormwater runoff tend to <br /> increase in these. cleared strips and the potential for erosion is much greater since the <br /> vegetative cover is diminished or removed . To compensate forthe loss of vegetation , itis <br /> usually a good practice to break up the flow length within the cleared strip so that runoff <br /> does not have a chance to concentrate and cause erosion . At proper spacing intervals , <br /> Temporary Right-of-Way Diversions can significantly reduce the amount of erosion which <br /> ,. will occur until the area is permanently stabilized . <br /> Design Criteria <br /> • No formalAesign is required . The following criteria shall be met: <br /> ,. Drainage Area <br /> Less than 5 acres (2 he). For larger drainage areas use a DIVERSION. - Section 5. 18 (ES <br /> • BMP 1 . 18) . <br /> Dimensions <br /> The minimum allowable height measured from the upslope side of the diversion is 18 <br /> inches (45 cm). The minimum top width shall be 2 feet (60 cm ) and the base width <br />• minimum is 6 feet (1 . 8 m) . (See Plate 4. 17a) <br /> Side Slopes <br /> 3 : 1 or flatter to allow the passage of construction traffic. <br />• <br /> 4-63 <br />