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City Building inspection Department <br />September 12, 1979 <br />Page 2 ) <br />In <br />i <br />Orifice_ Opening J' <br />Diameter 1.7" se 211014,500 <br />Discharge 40)(1.3)(43-- 0) _ .17 CFS <br />Head = 4.66 ft. <br />__ ��� _ .17 •17 = .016 Ft.2 <br />A (.63)J64.4H (.63) (4.66) .63(17.32) <br />A 4(Z)2 D - 2j= .07'(2) _ .14 = 1.7" <br />Outlet Pipe: <br />Diameter = 8" <br />Slope = 1.9 in 100 - 1.9% <br />Capacity = 1.8 CFS from Nomograph <br />Post Development Capacity = .95(1.6)(14,500 43,560) _ •51 CPS L 1.8 CPS <br />Capacity of outlet pipe OK <br />Detention System #1 <br />24" Dia.Conc.Pipe Btwn 2 catch basins 104' O.C. <br />v = 3.1415(100) = 314 CFT 24" Dia. Pipe 100' Long <br />v - 3.1415(4)(4.66) = 59 CFT Catch Basin #2 <br />v = 3.1415(4)(3) = 38 CFT Catch Basin #1 <br />Total 411 CFT > 403 CFT <br />RETE14TIONZaETENTION SYSTEM #2 at VOCATIONAL BUILDING <br />Post Development Areas: <br />(New) 5,760 sq.ft. Paved Area C .95 <br />(Existing) 8,700 " " Paved Area or Roof <br />5,750 " " Grass C .4 <br />20,210 sq.ft. Total Effective C .79 <br />Pre Development Areas: <br />8,700 sq. ft. Paved Area C = .95 <br />5,120 Gravel C = .7 <br />6,390 Grass C = .4 <br />20,210 sq. ft. Total Effective C = .71 <br />