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STORM DRAIN RETENTION CALCU U�TIONS FOR SE/1TAWA <br />Tolal volume provided: <br />I. Ponds - North <br />- S tl <br />/' �o;:'�s -C, > <br />� � <br />,;;� <br />��s ���.�.-- . � t,-.-, ,.- <br />oc�ubcr z, 19/f3�.-G <br />rii� N�. 5,II9n <br />Pond. Norlh South <br />_ I I �� 1 � <br />Vol. � 255.8 I 197.'� ft.3 <br />255.8 tc.3 <br />ou , 197.o ft.3 <br />Ups[ream ponds - North V= 22(0.3) . 18 = 19.8 ft.3 <br />2 3 <br />- snuch V= 15i0.3) 18 _ 9.0 ft.3 <br />2 . �. _ <br />Su6surl x�: v.t. = vurCical leel beCwcen invcrl and overFlo��i eleva[ion <br />3.92 v.f. oF Type II CB (� 12.57 ft.3/v.f. = 49.3 ft.3 <br />(3.24 + 2.98 + 2.77 + 2.61) v.f. of CB IS C� 3.85 ft.3/vf=44.7 ft.3 <br />330 1.f. of 12" hel. pipe @ 0.7854 ft.3/I.f. = 259.2 ft.3 <br />3D�i.8� <br />Vol. requireJ = 834•8 ([.3�'819.8 requireJ,', o.k. <br />S�ZE TH[ RESTRICTOR ORIFICF: <br />Qoriti. = Qex �I[ is assumed ChaC Chis system will retain all developed Flow) <br />Hcad = li = overflow elevation - invert elevation = 607.20 - 603•za = 3•9Z <br />/ 4Q ' 4(O.zl) � <br />��oriP. _/ p. j� 9� = 0. 37/ 9 x 12 = 1�96 in. Use I-7/8 in. dia. orifice <br />V V <br />►i <br />