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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 B for estimating SSOÓs out of maintenance <br />holes without covers is based on discharge over curved weir -- bell mouth <br />spillways for 2Ñ to 12Ñ diameter pipes. The formula was taken from hydraulics <br />and its application by A.H. Gibson (Constable & Co. Limited). <br /> <br /> <br /> <br />Example Overflow Estimation: <br /> <br />The maintenance hole cover is off and the flow coming out of a 36Ñ frame <br />maintenance hole at one inch (1Ñ) height will be approximately 660 gallons per <br />minute. <br />FLOW OUT OF M/H WITH COVER REMOVED (TABLE "B") <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 /> <br /> <br />