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Best Management Practices: Temporary Sediment Basin [Sd3] Designed to detain runoff water and trap sediment, temporary basins help protect properties and drainage ways from excessive sedimentation and debris. Basins should be located so that storm drains discharge into that designated area. They are generally constructed by placing a dam across an area of concentrated flow, by excavating a basin, or a combination of the two. Location, drainage area, soil type, and the expected rainfall pattern all affect the size of the basin. Typically consisting of a dam, a pipe outlet, and an emergency spillway; the basin will temporarily store water allowing the sediment to settle before the water is released through the outlet structure. The sediment basin is usually the final area to trap sediment before water is discharged from the site. The storage capacity should equal 67 cubic yards for each disturbed acre draining to the basin. When sediment reaches one-third of the original basin volume, the sediment should be removed. Sediment basins should NEVER be placed in a live stream. |
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