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Figure II-B-App. 7-Att . 3-2 <br /> PREPARATION PLAN AREA SEDIMENTATION PONDS <br /> ,Original Ground Surface ,Invert of Spillway <br /> � Pipe <br /> �12" Dia. CMP <br /> Pipe Spillway <br /> Lj <br /> !'rY d25d10 d _ 15` ten/ - --Compacted <br /> + Embankment <br /> a Extend to <br /> Stream Channel____ <br /> TYPICAL SECTION THROUGH POND <br /> NOMENCLATURE: <br /> a = bottom width of sedimentation pond - <br /> i <br /> b = bottom length of sedimentation pond <br /> CIS = maximum depth of sediment before mechanical cleanout <br /> i <br /> djo = maximum sediment depth, ds , plus depth of runoff <br /> volume from 10-year/24-hour storm <br /> d 25 = maximum sediment depth, ds , plus depth of runoff <br /> volume from 25-year/24-hour storm <br /> y <br /> SEDIMENT POND DIMENSIONS <br /> Drainage Total Bottom Bottom <br /> Sub- Pond Width Length <br /> Area Volume a b Design Depths (r^t) <br /> No. (AF) (Ft) (FQ d s d jo d 25 <br /> 1 0.58 45 65 4.1 6.0 6.2 <br /> 2 0.63 45 70 4.1 6.0 6.3 <br /> 3 3.17 115 170 • 4.0 6.0 6.2 <br /> 3A 1.84 85 130, 5.1 6.0 6.1 <br /> 4 2.64 105 155 5.1 6.0 6.1 <br /> 5 2.69 105 160 5.4 6.0 6.5 <br /> 6 0.50 40 65 5.2 6.0 6.1 <br /> 7 0.48 40 60 5.0 6.0 6.1 <br /> 16 <br />