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Florida Erosion and Sediment Control Inspector's Manual •• <br /> When used in conjunction with diversion dikes , temporary slope drains can be used to convey <br /> stormwater from the entire drainage area above a slope to the base of the slope without <br /> erosion . It is very important that these temporary structures be installed properly since their <br /> failure will often result in severe gully erosion . The entrance section must be securely <br /> entrenched , all connections must be watertight, and the conduit must be staked securely. <br /> Design Criteria <br /> Drainage Area <br /> The maximum allowable drainage area per drain is 5 acres (2 ha ) . <br /> Flexible Conduit <br /> 1 . The slope drain shall 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 intervals. <br /> 2 . Slope drains shall be . sized according to the following table : <br /> Table 4. 30a <br /> SIZE OF SLOPE DRAIN <br /> Maximum Drainage Area (Acres) Pipe Diameter (in . ) <br /> 0 . 5 12 .r <br /> 1 . 5 18 <br /> 2.5 21 <br /> 3 .5 24 �. <br /> 5 .0 30 <br /> Overside drain <br /> For small flows and/or short slopes , an open top chute may be used in place of a pipe . (See <br /> Plate 4 . 30c) . <br /> Entrance Sections <br /> .r <br /> The entrance to the slope drain shall consist of a Standard FDOT " Flared End-Section for <br /> Metal Pipe Culverts . " Extension collars shall consist of 12 inch (30 cm ) long corrugated metal <br /> pipe . Watertight fittings shall be provided . (See Plates 4 . 30d & 4 . 30e) . <br /> .r <br /> 4- 102 <br /> rr <br />