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Image Placeholder <br />ACOMPREHENSIVE SANITARY <br />SEWER PLAN <br />2040 COMPREHENSIVE PLAN UPDATE DRAFT Dec14-17 <br />for review only <br />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 />Table 11-3 MCES Peak Flow Design Factors <br />Average Daily Flow (MGD)MCES Peak Flow <br />Design Factor <br />0�00 – 0�11 4�0 <br />0�12 – 0�18 3�9 <br />0�19 – 0�23 3�8 <br />0�24 – 0�29 3�7 <br />0�30 – 0�39 3�6 <br />0�40 – 0�49 3�5 <br />0�50 – 0�64 3�4 <br />0�65 – 0�79 3�3 <br />0�80 – 0�99 3�2 <br />1�00 – 1�19 3�1 <br />1�20 – 1�49 3�0 <br />1�50 – 1�89 2�9 <br />Average Daily Flow (MGD)MCES Peak Flow <br />Design Factor <br />1�90 – 2�29 2�8 <br />2�30 – 2�89 2�7 <br />2�90 – 3�49 2�6 <br />3�50 – 4�19 2�5 <br />4�20 – 5�09 2�4 <br />5�10 – 6�39 2�3 <br />6�40 – 7�99 2�2 <br />8�00 – 10�39 2�1 <br />10�40 – 13�49 2�0 <br />13�50 – 17�99 1�9 <br />18�00 – 29�99 1�8 <br />Over 30�00 1�7