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The overflow riser was sized to convey the 100-year undetained developed flow of 12.78 <br />cfs. The riser was designed assuming 1.5 feet of head. Please reference the calculations <br />below as well as figure 1-5.16 located in the Appendix. <br />I Q�r� = 3.782(Dx���rz <br />12.78 = 3.7s2(D2)(l.$)�a <br />I D = 1.66 feet = 19.92 inches <br />The overJ/ow risn will be 21 inches in diameter and located at an e%vation oj509.S0 <br />to a/!ow jor additiona/ volume associaled with possib/e fitfwre sitt devdopments. <br />Storn� Drninnge Xe�xirt I�or Aing Extrusion - Page 1I <br />