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Collection System Collaborative Benchmarking Group <br />Best Practices for Sanitary Sewer Overflow (SSO) Prevention and <br />Response Plan <br />The formula used to develop Table A measures the maximum height of the water <br />coming out of the maintenance hole above the rim. The formula was taken from <br />hydraulics and its application by A.H. Gibson (Constable & Co. Limited). <br />Example Overflow Estimation: <br />The maintenance hole cover is unseated and slightly elevated on a 24" casting. <br />The maximum height of the discharge above the rim is 5 1/4 inches. According to <br />Table A, these conditions would yield an SSO of 185 gallons per minute. <br />FLOW OUT OF M/H WITH COVER IN PLACE <br />Height to be measured <br />This sanitary sewer overflow drawing was developed by Debbie Myers, Principal <br />Engineering Technician, for Ed Euyen, Civil Engineer, P.E. No. 33955, California, <br />of County Sanitation District 1. <br />19F-94 <br />