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Ovet flow Elevation = 513.04 <br />I.E. @ Restrictor = 504.70 <br />H@ Restrictor = 513.04 - 504.70 = 8.34' <br />Ori�ce size @ outlet control stru�ture for H= 8.34': <br />D= 6.12 1.17/(8.34)Z = 3.90 in. diameter <br />Capacity of outfet pipe (18" @ 1.0;) <br />Q= 7.49 D Z�' S� DZ n= 0.012 D= 1.5' <br />n 4 4 S= 0.01 S� = 0.10 <br />Q= 11.4 C F5. 1.49/n = 124.17 <br />Tc (deVeloped) = 850/(EO)(2) = 7.1 min. <br />Q25= (0.79)(2.5)(10.0) = 19.7CFS. <br />Filling Time = 23,878/19.7 = 1212 Sec. = 20.2 min. <br />;,Tc = 20.2 + 7,2 = 27.3 min. iZs = 1.35 in./hr. <br />;, Q=( 0.79) (1. 35) (10.0) = 10. 7 CFS � 11. 4 CFS <br />(18" outlet pipE is adequate) <br />By observatiun a 15" riser is also adequate. <br />