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V� _ 3607T _ �,�� �o.p� = 1563 �t� acre <br />T•h25 <br />Vt = Ns) (.�) (�ae�•) ft3 <br />Vt = (1G63)(.4187)(,64) _ �145.G ft3 req, storage <br />STliP 7 <br />D = 6.07 Q <br />(h) 1/2 <br />D = 6.07 0996 <br />(2) 1/2 <br />L'se a 2" oriiice <br />STliP 3 <br />Assume h = 2 feet <br />_ �.G1 in. <br />Tc = 120 = 1 i- 10 = 11 min., therefore, <br />(2}60 <br />from Figure 2"i" = 1.II in./hr. <br />Qr2q'd = �dev ii) (��) <br />_ .G4(1.8) (.4187) _ ,�}E323 ft3/sec <br />Assurce slope of outlet pipe is 2/, therefore, from rigure 4, the out- <br />let pipe must have a diameter of at least u inche�, use 10 inches. <br />Q _ 1.49(D)2/3 <br />n (4) <br />Q = 1.49 .5 Z/3 <br />(.012)(4) <br />51�� � �2 <br />4 <br />x (,02)1�2 x 3.14 •� = 1.495 <br />Q= 1.4�Si .�323 C�,IC. Use 10" outlet pipe. <br />DESIGN OF RliTLNTION SYSTLfi <br />P.equired storage volume is 445.6 f-t3 <br />Tppe II-C Catch 3asin <br />Depth 5'-2" (inside dimei�sions) <br />Lifective depth for co m p uting reten!-iun is 2'-7" <br />Diameter is 4'-0" <br />Araa whick: �an be retained is 32.4 ft'' <br />