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May 29, 1980 <br />File No. 80-075 <br />Page 2 <br />STORM WATER DETENTION SYSTEM CALCULATIONS FOR PROPOSEO 9-UNIT APARTMENT (con[.) <br />Solving for A= Q �'19 = 0.027 ft.Z <br />cd 2gh a 0.62 . 2 <br />If 2-1/4" ort�ice = 0.0276 ft.2 Is used the h wtll change <br />Therefore, solving for h Q Z = ���q Z a 1•91' = h <br />� (cdA'�9 ( 0. 2 0.027 , ��.4 <br />Slzing the Detenlfon System <br />Required volume of detentlon = 213.93 ft.3 <br />4' dia. Type 2 MH = 12.57 (t.3/�.{, <br />v.f. = vertfcal feet above flow Ilne of outlet <br />CB Type 16 = 5.79 ft.3/v.f. <br />18" culv. = 1.767 ft.3/I.i. <br />15" culv. = 1.23 ft.3/l.f. <br />�2�� CII�V. = 0.785 ft.3/I.f. <br />CBMN No. 1= Type II 48" 191 v.f. x 12.51 ft.3/v.f. <br />50 I.f. 15" - 16 ga. hel. alum. culv. @ 1.23 Pt.3/l.f. <br />CB No. 2 Type 16 = 1.66 v.(. x 5.79 ft.3/v.f. <br />73 l.f. 18" - 16 ga. hel. alum. culv. @ 1.76 ft.3/I.f. <br />CB No. 3 Type 16 = 1.50 v.f. x 5•79 ft.3/v.f. <br />Total detention provlded <br />Requlred volume <br />Excess volume providFd <br />Thereforc, o.k. <br />� 24 f[.3 <br />= 61.5 fc•3 <br />� 9.61 ft.3 <br />= 128.99 ft.3 <br />� 8.68 ft.3 <br />v 23Z,78 f[.� <br />_ -213.93 ft•3 <br />18.85 ft.3 <br />STRI <br />� <br />