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Collection System Collaborative Benchmarking Group <br />Best Practices for Sanitary Sewer Overflow (SSO) Prevention and <br />Response Plan <br /> TABLE 'C' <br />ESTIMATED SSO FLOW OUT OF M/H PICK HOLE <br />Height ofSSOHeight ofSSO <br />spout aboveFLOWspout aboveFLOW <br />M/H coverM/H cover <br />QQ <br /> in inchesin gpmin inchesin gpm <br />HH <br /> 1/81.05 1/86.2 <br /> 1/41.45 1/46.3 <br /> 3/81.75 3/86.3 <br /> 1/21.95 1/26.4 <br /> 5/82.25 5/86.5 <br /> 3/42.45 3/46.6 <br /> 7/82.65 7/86.6 <br />12.766.7 <br />1 1/82.96 1/86.8 <br />1 1/43.16 1/46.8 <br />1 3/83.26 3/86.9Unrestrained <br />1 1/23.46 1/27.0M/H cover will <br />1 5/83.56 5/87.0start to lift <br />1 3/43.66 3/47.1 <br />1 7/83.76 7/87.2 <br />23.977.2 <br />2 1/84.07 1/87.3 <br />2 1/44.17 1/47.4 <br />2 3/84.27 3/87.4 <br />2 1/24.37 1/27.5 <br />2 5/84.47 5/87.6 <br />2 3/44.57 3/47.6 <br />2 7/84.67 7/87.7 <br />34.787.7 <br />3 1/84.88 1/87.8 <br />3 1/44.98 1/47.9 <br />3 3/85.08 3/87.9 <br />3 1/25.18 1/28.0 <br />3 5/85.28 5/88.0 <br />3 3/45.38 3/48.1 <br />3 7/85.48 7/88.1 <br />45.598.2 <br />4 1/85.69 1/88.3 <br />4 1/45.69 1/48.3 <br />4 3/85.79 3/88.4 <br />4 1/25.89 1/28.4 <br />4 5/85.99 5/88.5 <br />4 3/46.09 3/48.5 <br />4 7/86.09 7/88.6 <br />56.1108.7 <br />Note: This chart is based on a 7/8 inch diameter pick hole <br /> <br />Disclaimer: This sanitary sewer overflow table was developed by Ed Euyen, Civil <br />Engineer, P.E. No. 33955, California, for County Sanitation District 1. This table <br />is provided as an example. Other Agencies may want to develop their own <br />estimating tables. <br /> <br />