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• <br /> Chapter 4 - Best Management Practices. for. Erosion and Sediment. Control <br /> r <br /> 4. 25 TEMPORARY SEDIMENT TRAP <br /> • (ES BMP 1 . 25) <br /> Definition <br /> r A small temporary ponding area formed by excavation and/or an embankment across a <br /> drainageway. <br /> r <br /> Purpose <br /> • To detain sediment-laden runoff from small disturbed areas long enough to allow most of <br /> the sediment to settle out thereby protecting drainageways , properties, and rights-of-way <br /> from sedimentation . <br /> r <br /> Conditions WherePractice Applies <br /> • 1' . A sediment trap is usually installed In a drainageway, at a storm drain inlet or at <br /> other points of discharge from a disturbed area . <br /> ., 2 . Below drainage areas of 5 acres (2 ha) or less . <br /> 3 . Where the sediment trap will be used less than 18 months . <br /> r <br /> 4 . The sediment trap may be constructed either independently or in conjunction with <br /> a TEMPORARY DIVERSION DIKE - Section 4 . 15 (ES BMP 1 . 15) . <br /> • <br /> Plannirrg Considerations <br /> The sediment trap should be located to obtain the maximum storage benefit from the <br /> terrain , for ease of clean out and disposal of the trapped sediment and to minimize <br /> interference with construction activities. <br /> r <br /> Sediment traps should be used only for small drainage areas . If the contributing drainage <br /> area is greater than 5 acres (2 ha), refer to SEDIMENT BASINS - Section 4 .26 (ES BMP <br /> ,. 1 .26) . <br /> Sediment must be periodically removed from the trap. Plans should detail how this <br /> ., sediment is to be disposed of, such as by use in fill areas on site or removal to an <br /> approved off-site dump. <br /> r Sediment traps , along with other perimeter controls , shall be installed before any land <br /> disturbance takes place in the drainage area. <br /> • <br /> • <br /> • <br /> 4-67 <br />