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Chapter 4 - Best Management Practices for Erosion and Sediment Control <br /> Design Criteria <br /> No formal design is required . The following criteria shall be met: <br /> Drainage Area <br /> .. The maximum allowable drainage area is 5 acres (2 ha) . <br /> Dimensions <br /> The minimum allowable height 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 /> 4W <br /> 3 : 1 or flatter. <br /> Grade <br /> The channel behind the dike shall have a positive grade to a stabilized outlet. If the channel <br />"" slope is less than or equal to 2% , no stabilization is usually required . If the slope is greater <br /> than 2% , the channel shall be stabilized in accordance with STORMWATER CONVEYANCE <br /> CHANNEL - Section 5 . 35 ( ES BMP 1 .35 ) . <br /> W* <br /> Outlet <br /> aw 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 Specifications <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 />.r days of construction . <br /> 4 . The dike should be located to minimize damages by construction operations and <br /> traffic. <br /> r <br /> 4-57 <br />