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Cit Buildin Inspection Department <br />e to er 197P <br />Page <br />Outlet PiP W �p� Ir <br />¢:lfs 6Ai S"/t }pleAl ? <br />,o ' panic -fo be e: 6 " %�� iefb <br />'� <br />Diameter 6" <br />Slope _ •35 in 60 or .58 in 100 .58% PX'rliep �f � <br />Capacity a .99 CFS / <br />23,985 = ,74 .99 CFS <br />Poet Development Capacity = .84(1.6)(43,560) <br />8" Dia. O.K. <br />Retention/Detention SYetem #k3 <br />24" Dia. Conc. Pipe Btwn 2 Catch Basins @ 84'-0" o.c. <br />V = (12.57) (3) = 38 CFT Catch Basin ##4 <br />V = (12.57)(4.66) = 59 CFT Catch Basin #j5 <br />V = 3.1415(70) 251 CFT 24" Conc Pipe 80' Long <br />V Total 348 CFT > 341 CFT <br />DETENTION/RETENTION SYSTEM #j4 @ GYMNASIUM <br />Pre Development Areas: <br />2,354 sq.ft. Vacant Area Dirt 6 Grass c : .6 <br />1,819 Gravel <br />21,609 Paving or Concrete C 695 <br />25,782 sq.ft. Total Effective C .9 <br />Poet Development Areas: <br />25,782 sq.ft. paving, cone. walks or roof C = .95 <br />Design Storm: <br />Pre Development frequency I. in LO years <br />Post Development frequency 1 in 25 years <br />Intensity Pre Development 1.3 in./hr. <br />Intensity poet Development 1.206min minutes <br />Duration <br />Pre Development Design Runoff: <br />90(3)(T7) 25,782 = .90(931) = 838 CFT <br />post Development Design Runoff: <br />6 1 <br />95 ( ) () 25, 782 = .95 (1,14(,) = 1,088.5 CFT <br />Runoff Differential = 256 CFT <br />a Al <br />