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r <br /> Chapter 4 - Best Management Practices for Erosion and Sediment Control <br /> 4. 17 TEMPORARY RIGHT-OF-WAY DIVERSION <br /> (ES BMP 1 . 17) <br /> r <br /> Definition <br /> r A ridge of compacted soil or loose rock or gravel constructed across disturbed <br /> rights-of-way and similar sloping areas . <br /> r 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 /> Conditions Where Practice Applies <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 applicable 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 for the loss of vegetation , it is <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 /> r <br /> Design Criteria <br /> r No formal design is required . The following criteria shall be met: <br /> Drainage Area <br /> Less than 5 acres (2 ha) . For larger drainage areas use a DIVERSION - Section 5 . 18 (ES <br /> BMP 1 . 18) . <br /> r Dimensions <br /> The minimum allowable height measured from the upslope side of the diversion is 18 <br /> r 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 /> r <br /> 4-63 <br />