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j <br /> I <br /> sedimentation basin, the control structure for the permanent pond can <br /> be used to maintain predevelopment discharge limitations. The size of <br /> the basin, the expected life of the construction project, the anticipated <br /> downstream effects and the anticipated weather conditions during <br /> construction, should be considered to determine the need of additional <br /> discharge control. See Figure 4.2.21 for riser inflow curves. <br /> Key divider into slope <br /> to prevent flow <br /> around sides <br /> The pond length shag be 3 to 6 <br /> times the maximum pond width Emergency overflow <br /> I <br /> _ spiltway <br /> __. TPond length seep <br /> j Inflow— f Silt fence or <br /> �• equivalent derider Discharge to stabilized <br /> `� conveyance,outlet,or <br /> level spreader <br /> Note:Pond may be formed by berm or — <br /> P by partial or complete excavation <br /> I <br /> i Ir. <br />! l: <br /> i 4 <br /> I <br /> s <br /> Figure 4.2.18- Sediment Pond Plan View <br /> t I; <br /> i <br /> j` Riser pipe <br /> [ is (principal spillway) Crest of <br /> s open at top with 6'min.Width <br /> i trash rack emergen spillway <br /> l-Ji Tr �— - ----;•uy Embankment compacted95% <br /> it .IEI-11 -1 Dewaterin device <br /> 9 pervious materials such as <br /> (see riser detail) <br /> �q." _ -___y i gravel or clean sand shall <br /> i r l _ �� _ _ not be used <br /> r I IIJ II==:m�:itr��rr.-_rtr <br /> -I <br /> l 111. 111=:1J it I:-1(I III �Ii-II <br /> it-:i ill-llC�ll ii111_!I -I Discharge tostab ill <br /> zed <br /> Wire-backed silt fence Dewatenn9 Concrete base conveyance outlet or <br /> (see riser detail) levels <br /> staked haybales wrapped orifice i preader <br /> I with filter fabric,or <br /> E equivalent divider <br /> i S <br /> I 6 <br /> ft <br /> i Figure 4.2.19-Sediment Pond Cross Section <br /> i <br /> i <br /> I <br /> Volume II-C'onstiviction Slormtvafer Polhrlion Pi-evention-August 2012 <br /> 4-106 <br /> f <br /> I <br /> i <br />