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Chapter 4 - Best Management Practices for Erosion and Sediment Control Good timing is essential to fill construction . The filling operation should be completed as quickly as possible and the permanent slope protection measures and slope stabilization measures installed as soon after completion as possible . With quick and proper construction , the developer or contractor will save both time and money in building , repairing and stabilizing the fill area . The longer the time period for construction and stabilization , the more prone the fill operation is to damages by erosion . Repairing the damages adds additional time and expense to the project. Design Criteria No formal design is required . The following criteria shall be met: Drainage Area _ The maximum allowable drainage area is 5 acres (2 ha) . Height The minimum height of the supporting ridge shall be 9 inches (23 cm) . (See Plate 4 . 16a) . Grade The channel shall have a positive grade to a stabilized outlet. Outlet The diverted runoff should be released through a stabilized outlet, slope drain or sediment trapping measure . Construction Specifications 1 . The diversion shall be constructed at the top of the fill at the end of each work day as needed . 2 . The diversion shall be located at least 2 feet (60 cm) inside the top edge of the fill . (See Plate 4 . 16a) . r 3 . The supporting ridge of the lower side shall be constructed with a uniform height along its entire length . Maintenance Since the practice is temporary and under most situations will be covered the next work day, the maintenance required should be low. If the practice is to remain in use for more than one day, an inspection will be made at the end of each work day and repairs made to . the measure if needed . The contractor should avoid the placement of any material over the structure while it is in use . Construction traffic should not be permitted to cross the diversion . 4-61