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Peak Flow Factors <br />The sanitary sewer collection system must be capable of <br />accommodating not only average flows, but also the anticipated peak <br />flows. These peak flows can be expressed as a variable ratio applied <br />to average flow rates. This variable ratio, called the peak flow factor, <br />has been found to decrease as the average flow increases. The <br />peak flow factors applied in this study were based on typical MCES <br />peaking factors. They are generally considered conservative, and are <br />widely used for planning in municipalities throughout the Twin Cities <br />Metropolitan Area. Table 11-3 below lists the peaking factors used for <br />this study. <br />ITUW 2040 COMPREHENSIVE PLAN UPDATE <br />Table l l -3 MCES Peak Flow Design Factors <br />0.00-0.11 <br />4.0 <br />1.90-2.29 <br />2.8 <br />0.12-0.18 <br />3.9 <br />2.30-2.89 <br />2.7 <br />0.19-0.23 <br />3.8 <br />2.90-3.49 <br />2.6 <br />0.24-0.29 <br />3.7 <br />3.50-4.19 <br />2.5 <br />0.30-0.39 <br />3.6 <br />4.20-5.09 <br />2.4 <br />0.40-0.49 <br />3.5 <br />5.10-6.39 <br />2.3 <br />0.50-0.64 <br />3.4 <br />6.40-7.99 <br />2.2 <br />0.65-0.79 <br />3.3 <br />8.00- 10.39 <br />2.1 <br />0.80-0.99 <br />3.2 <br />10.40 - 13.49 <br />2.0 <br />1.00-1.19 <br />3.1 <br />13.50 - 17.99 <br />1.9 <br />1.20-1.49 <br />3.0 <br />18.00 - 29.99 <br />1.8 <br />1.50-1.89 <br />2.9 <br />Over 30.00 <br />1.7 <br />If <br />:111280McNYA <br />for review only <br />COMPREHENSIVE SANITARY A <br />SEWER PLAN <br />