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n <br />Storm Drainage Calcs. - Evergreen Business Park <br />Additional Storage due to Lag Ti�ae <br />a = 0.2(2.09)(1.3) = 0.54 cfs. <br />Mean Rate of Discharge = 0.2� cfs. <br />Additional Storage Required = <br />0.27(5)(60) = 82 cf. <br />Total Storage Required = 1943 cf. <br />Storage Provided <br />Parking Lot <br />13,025 sf. - 6" deep <br />- 3 - <br />Sizing Orifice @ CBMH 8 <br />A= 0/Cd 2gh = G.54/0.63 64.4(3.%1 = 0.06 sf. <br />Dia. = 4A = 0.2'] ft. = 3.19 in. <br />�1T' <br />Use 3-1/8" dia, orifice. <br />Check 0 for 3-1/8" ori.fice with 3.�1 ft, head, <br />A=�� = 7.67 in.2 = 0.05 ft.z <br />Q= CdA �;h + 0.52 cfs. OK. <br />Chec4 capacity of 12" CMP for cverflow. <br />Fi.ow Full 0.55 cfs. - S].ope 0.5% min. <br />Sept. 27, 1979 <br />= 21%1 cf. <br />. � � �S-�''rf <br />