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Figure II-B-App. 7-Att . 3-2 <br /> PREPARATION PLANT AREA SEDIMENTATION PONDS <br /> �-Original Ground Surface ,Invert of Spillway <br /> Pipe <br /> A2" Dia. CMP <br /> Pipe Spillway <br /> _ o <br /> �Sy d25dI0 151 �j7j --Compacted <br /> d s , " • Embankment <br />� a - Ji Extend to � <br /> Stream Channel---- <br /> TYPICAL SECTION THROUGH POND <br /> NOMENCLATURE: <br /> a bottom width of sedimentation pond - <br /> b = bottom length of sedimentation pond <br /> ds = maximum depth of sediment before mechanical cleanout <br /> d70 = maximum sediment depth, ds plus depth of runoff <br /> volume from 10-year/24-hour storm <br /> i - <br /> d 25 = maximum sediment depth, ds , plus depth of runoff <br /> volume from 25-year/24-hour storm <br /> f <br /> ` SEDIMENT POND DIMENSIONS <br /> Drainage Total Bottom Bottom <br /> ' Sub- Pond Width Length <br /> a b <br /> Design Depths (Ft) <br /> Area Volume <br /> No. (AF) (FQ (FQ d S d 10 d 25 <br /> 4 <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 />