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Florida Erosion and Sediment Control Inspector's Manual <br /> Design Catena <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 /> Dimensions <br /> The minimum allowable-.h eight 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 .4m) . (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 /> 4-56 <br />