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City Building Inspection Department <br />September 12, 1979 <br />Page 6 <br />Orifice Opening: <br />Diameter . 4" 25,782 = ,69 CPS <br />Discharge .9(1.3) 43,560 <br />Head = 4.66 <br />•69 = .69 .09 Ft. <br />A = <br />.63 66) .63(17.32) <br />D - 2 �" <br />_ .169(2) _ .339 - 4.06 use 4Q <br />Outlet Pipe: <br />Diameter Q 8" <br />Slope 6" in 100' or .006 min. <br />Capacity 1 CPS From Nomograph <br />Post Development Capacity <br />25,782 = 9 CPS � 1 CPS <br />(.95)(1.6) 43,560 <br />Capacity of outlet pipe O.K. <br />Retention/Detention System 4 4 <br />24" Conc. Pipe Between 2 catch basins @ 56'-0" o.c. <br />V - 12.57(3) = 38 CPT Catch Basin M6 <br />V = 12.57(4.66) = 59 CFT p catch Basin M7 <br />V - 3.1416(52) = 163 CFT 18 Conc. Pipe 52 0" Long <br />V = Total - 260 CFT > 256 CFT <br />Yours very truly, <br />BOTESCH, NASH AND ASSOCIATES <br />Jo <br />tape -, <br />JCE:imw <br />L <br />