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Erosion and Sediment Control <br />Design Cntena <br />No formal design is required. The following criteria shall be met: <br />Drainage ge Area <br />The maximum allowable drainage area is 5 acres (2 ha). <br />nual I <br />Dimensions <br />The minimum allowable beight measured from the upslope side of the dike is 18 inches (45 <br />cm). Top width shall be a minimum of 2 feet (60 cm) with a minimum base width of 4.5 feet <br />(1.4 m). (See Plate 4.15a) <br />Side Slopes <br />3:1 or flatter. <br />Grade <br />The channel behind the dike shall have a positive grade to a stabilized outlet. If the <br />channel slope is less than or equal to 2%,.no stabilization is usually required. If the slope <br />is greater than 2%, the channel shall be stabilized in accordance with STORMWATER <br />CONVEYANCE CHANNEL - Section 5.35 (ES BMP 1.35), <br />Outlet <br />1. The diverted runoff, if free ,of sediment, must be released through a stabilized <br />outlet or channel. <br />2. Sediment -laden runoff must be diverted and released through a sediment trapping <br />facility. <br />construction Spec fications <br />1. Whenever feasible, the dike should be built before construction begins on the <br />project. <br />2. The dike should be adequately compacted to prevent failure. <br />3. Temporary, or permanent seeding and mulch shall be applied to the dike within 15 <br />days of construction. <br />4. The dike should be located to minimize damages by construction operations and <br />traffic. <br />