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<br />Assume: No static head at inlet <br />free outfall <br />Culvert Diameter 18" <br />From Mear's Water Flow Calculator for pipes, ducts and sewers. Using the <br />rational formula and Moody's pipe roughness and frictional coefficients <br />for various materials. <br />p = 17 cfs ~ 1.32 cfs. so o.k. <br />Minimum 18" size used to facilitate cleanout. A 7.5" diameter culvert <br />• would be sufficient to accommodate the peak dl5charge. <br />• <br />