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Chapter 4 - Best Mane ament Practicea.foc Erosion and Sediment_Con o <br /> When used in conjunction with diversion dikes., temporary slope drains can be used to <br /> convey stcrmwater from the entire drainage area above a slope to the base of the slope <br /> without erosion . it is very important that these temporary structures be installed properly <br /> since their failure will often result in severe gully erosion .. The entrance section must be <br /> securely entrenched , all connections must be watertight, and the conduit must be staked <br /> securely. <br /> sia_Den� ria <br /> Drainage__Area <br /> The maximum allowable drainage area per drain is 5 acres (2 ha) . <br /> Flexibles uit` <br /> 1 , The slope drain sha{I consist of heavy duty . flexible material designed for this <br /> purpose. The diameter of the slope drain shall be equal over its entire length . <br /> Reinforced hold-down grommets shall be spaced at 10 foot (3 m), maximum <br /> intervals . <br /> 2 . . Slope drains shall be sized according to the foligwing table: <br /> Table 4.30a <br /> SIZE . OF SLOPE DRAIN <br /> Piae Diameter in . <br /> iVtaximum Drainage Area (Acresl 2 <br /> 1 .5 21 <br /> 2 .5 24. <br /> 3 . 5 30 <br /> 5 . 0 <br /> Overside drain <br /> ort slopes , an open top chute may be used in place of a pipe. <br /> For small flows and/or sh <br /> (See Plate 4.30c) . <br /> Entrance .Sections <br /> The entrance to the slope drain shall consist of a Standard FDOT FlaredEnd <br /> for <br /> Metal Pipe Culverts ." Extension collars shall consist of 12 inch (30 cm) long corrugated <br /> metal pipe . Watertight fittings shall be provided . (See Plates 4.30d & 4 . 30e) . <br /> ` 4-101 <br />