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City Building Inspection Department <br />September 12, 1979 <br />Page 2 <br />Orifice Opening <br />Diameter = 1.7" 1 use 2' 14,500 <br />Discharge - U - (.40)(1.3)(��1 - .17 CPS <br />Head - 4.66 ft. <br />A R Q_ 17 - , .17 - .016 Pt. 2 <br />f.63)Jb (.63)vF4—.4jT4.-6S .63(17.32) <br />IY(Z)2 D - 2/' - .07'(2) - .14 - 1.7"¢ <br />IT <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)(1414,,5500 0) - .51 CFS 1.8 CFS <br />Capacity of outlet pipe OK <br />Detention SYeteT.�l <br />2,61, 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 CPT Catch Basin #2 <br />V - 3.1415(4)(3) - 38 CFT Catch Basin #1 <br />Total 411 CFT > 403 CFT <br />RETENTIONZDETENTION SYSTEM #2 at VOCATIONAL BUILDING <br />Poet Development Areas - <br />(Now 1 5,760 sq.ft. Paved Area C - .95 <br />(Existing) 8,700 Paved Area or Roof <br />5 750 Grano C - .4 <br />20 2f0 eq.ft. Total Effactive C - .79 <br />Pre Development Areas: <br />8,700 sq. ft. Paved Area <br />5,120 " Gravel <br />6.f 390 Grass <br />0sq. ft. Total <br />r .95 <br />C 7 <br />r. - .4 <br />Effective C - .71 <br />1 <br />