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Chapter 4-Site-Specific industrial Storm Water BMPs <br />What Are They <br />Pipe slope drains reduce the risk of erosion by discharging runoff to stabilized areas. Made of <br />flexible or rigid pipe, they carry concentrated runoff from the top to the bottom of a slope that has <br />already been damaged by erosion or is at high risk for erosion. They are also used to drain <br />saturated slopes that have the potential for soil slides. Pipe slope drains can be either temporary or <br />permanent depending on the method of installation and material used. <br />Discharge into a <br />stabilised watercourse, <br />sediment trapping device.-] <br />onto a stabilized area. <br />Earth Dike <br />..,' ?f. <br />41 <br />:. ` ,1 ?' '? • • fir. <br />?'?. ?a ;?? wi.l, '=ti.;:;r' .'... :':• n'. .dlr. <br />'v;, <br />FIGURE 4.18 FLEXIBLE PIPE SLOPE DRAIN <br />(Modified from State of Maryland, 1983) <br />• <br />C <br />When and Where to Use Them <br />Pipe slope drains are used whenever it is necessary to convey water down a slope without causing <br />erosion. They are especially effective before a slope has been stabilized or before permanent <br />drainage structures are ready for use. Pipe slope drains may be used with other devices, including <br />diversion dikes or swales, sediment traps, and level spreaders (used to spread out storm water <br />runoff uniformly over the surface of the ground). Temporary pipe slope drains, usually flexible <br />tubing or conduit, may be installed prior to the construction of permanent drainage structures. <br />Permanent slope drains may be placed on or beneath the ground surface; pipes, sectional <br />downdrains, paved chutes, or clay tiles may be used. . <br />4-77-