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City Building Inspection Department. Scptembar 12, 1979 <br />paye 3 <br />Desirin Storm <br />pre Development frequency <br />Post Development frequency <br />Duration <br />Intensity Pre Development <br />intensity Post development <br />1 in 10 years <br />1 in 25 years <br />20 minutes <br />l.s in./hr. <br />1.6 i.n./hr. <br />pre Development Design Runoff <br />(.71)(133)(1/12)(20,210) = .71(730) 518 CFT' <br />Yost Development Design Runoff <br />(.79)(�)(-Z)(20,210) .79(898) 709 CFT <br />Runoff Differential ft 191 CFT <br />Orifice Opening <br />DiemP"_er a 2-3/4" 20 210 .43 CPS <br />Discharge a .71(1.3)O <br />Head a 4.5 Ft. <br />.43 •43 Q .040 Ft.2 <br />A - <br />(.63) V(64.4) (4.5) (.63) (17.02) <br />113 a .226' or 2.71" t use 2-3/4 6 <br />outlet Pipe <br />giameter 6" <br />Slope 1" in 100' a 1% <br />e 1 <br />Capacity � �012 (•5) /3 (.O1) 2 .61 <br />20 210 .596 c88 <.61 <br />Poet Development capacity - (.79)(1.6)(43,56U) <br />rapacity of outlet Fipc O.K. <br />RetentionZDetention System $2 <br />24" Dia. Conc. pipe Btwn New s Existing C.B. L+ 42'-0" 0.c. <br />v - (3.14.16)(38) 119 CFT <br />v - (12.57)(4.66) 59 CFT <br />V _ (12.57) 2.75 = 5 CFT <br />V Total <br />24" 0 cone, pipa38'-0" long <br />Catch Basin q3 <br />Existing C.B. <br />> 191 CFT <br />