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Table 18.5: Mississippi River District Projected Future Wastewater Flows by Sub -district <br />Sub -district <br />Existing <br />Average <br />Daily Flow <br />(gpd) <br />Existing <br />Peak Hourly <br />Flow <br />(gpd) <br />Future <br />Average <br />Daily Flow <br />(MGD) <br />Future Peak <br />Hourly Flow <br />(MGD) <br />Existing MUSA Service Area <br />0.161 <br />0.475 <br />0.161 <br />0.555 <br />Future Existing MUSA for Build -out <br />0 <br />0 <br />0.781 <br />2.530 <br />Northwest Sub -district <br />0 <br />0 <br />0.472 <br />1.578 <br />Southwest Sub -district <br />0 <br />0 <br />0.599 <br />1.976 <br />Ramsey Town Center <br />0 <br />0 <br />1.010 <br />3.195 <br />Sub -total <br />- <br />- <br />3.023 <br />7.534 <br />Future Rural (If Required) <br />0 <br />0 <br />1.076 <br />3.381 <br />TOTAL <br />0.161 <br />0.475 <br />4.099 <br />8.746 <br />(1) From 1991 Comprehensive Sanitary Sewer Plan. <br />In addition, there is a 27-inch sewer main that terminates at a manhole on the eastern <br />edge of the RTC development at the corner of Ramsey Boulevard and 143rd Avenue. <br />Assuming the minimum allowable design slope of 0.07%, the maximum instantaneous <br />flow that can be handled by this line is 8.216 MGD. Therefore, it appears that the <br />existing 27-inch main is sized to handle wastewater flows from the RTC development <br />and future growth from the Urban Growth and Rural Developing Areas. <br />Note: The 27-inch main mentioned above runs for two blocks before tying into a 30-inch <br />main. Because of this, and the uncertainty of future flows and pipe slopes, it is <br />recommended that a 30-inch sewer main be installed throughout the entire RTC <br />development and, if required, only two blocks of 27-inch main will need replacing in the <br />future. <br />Rum River MUSA District - To determine the future wastewater flows, the Rum River <br />MUSA Sub -District has been divided into two sub -districts: the Existing MUSA Sub- <br />district and the Rural Sub -district. Table 18.6 shows the current and future flows for the <br />Rum River District. <br />Table 18.6: Rum River District Projected Future Wastewater Flows by Sub -district <br />Sub -district <br />Existing <br />Average <br />Daily Flow <br />(gpd) <br />Existing <br />Peak Hourly <br />Flow <br />(gpd) <br />Future <br />Average <br />Daily Flow <br />(MGD) <br />Future Peak <br />Hourly Flow <br />(MGD) <br />Existing MUSA Service Area <br />0.390 <br />1.119 <br />0.390 <br />1.314 <br />Future Existing MUSA for Build -out <br />0 <br />0 <br />0.900 <br />2.881 <br />Sub -total <br />- <br />- <br />1.290 <br />3.960 <br />Future Rural (If Required) <br />0 <br />0 <br />1.864 <br />5.365 <br />TOTAL <br />0.390 <br />1.119 <br />3.154 <br />7.723 <br />18-9 <br />