Laserfiche WebLink
Chapter4- Best Management rraottces Tor erosion <br />r <br />Spacing <br />The following table will be used to determine.the spacing of right-of-way diversions: <br />% Slope 'Spacing in feet(m). <br />Less than 5% 300 (90 m) <br />Between 5% and 10% 200 (60 m) <br />Greater than 10% 100 (30 m) <br />Grade <br />r <br />Positive drainage, With less than 2% slope, should be provided to a stabilized outlet or <br />sediment trapping facility. <br />Outlet <br />Interceptor dikes must have an outletwhich is not subject to erosion. The on-site location <br />may need to be adjusted to meet field conditions in order to utilize the most suitable outlet. <br />Concentrated flows should spread over the widest possible area after release. Flows with <br />r high sediment concentrations should pass through a sediment trapping measure. (See <br />Plate 4.17b) <br />Construction Specifications <br />1. The diversion shall be installed as soon as the right-of-way has been cleared <br />and/or graded. <br />2. All earthen diversions shall be machine- or hand -compacted in 8 -inch (20 cm) lifts. <br />it <br />3. The outlet of the diversion shall be located on an undisturbed and stabilized area <br />when at all possible. The field location should be adjusted as needed to utilize a <br />,r <br />stabilized outlet. Sediment laden flows shall be conveyed.to a sediment trapping <br />device. <br />4. Earthen diversions which will not be subject to construction traffic should be <br />stabilized in accordance with TEMPORARY SEEDNG - Section 6.65 (ES BMP <br />.65). <br />• <br />Maintenance <br />The practice shall be inspected after every rainfall and repairs made if necessary. <br />Approximately once every week, whether a storm has occurred or not, the measure, shall <br />be inspected and repairs made if needed. Diversions which are subject to damage by <br />,,,, vehicular traffic should be reshaped at the end of each working day. <br />