Laserfiche WebLink
Table 18.5: Mississippi River District Projected Future Wastewater Flows by Sub -district <br />Sub -district <br />RTC Sub -district <br />Northwest Sub -district <br />Southwest Sub -district <br />Rural Developing' <br />Sub -total <br />Existing MUSA <br />TOTAL <br />Existing <br />Average <br />Daily Flow <br />(MGD) <br />0 <br />0 <br />0 <br />0 <br />0.161 <br />0.161 <br />Existing Peak <br />Hourly Flow <br />(MGD) <br />(1) From 1991 Comprehensive Sanitary Sewer P1an. <br />0 <br />0 <br />0 <br />0 <br />0.475 <br />0.475 <br />Future <br />Average Daily <br />Flow (MGD) <br />1.010 <br />0.472 <br />0.599 <br />1.427 <br />3.508 <br />0.161 <br />3.669 <br />Future Peak <br />Hourly Flow <br />(MGD) <br />3.100 <br />1.342 <br />1.677 <br />3.602 <br />6.422 <br />0.475 <br />6.520 <br />The combined future wastewater average and peak daily flows for the Mississippi River <br />MUSA District are 3.669 MGD and 6.520 MGD, respectively (Table 18.5). These flows <br />are well within the range for the design of the local regional interceptor which has a peak <br />daily capacity of 10 MGD. However, it does appear that improvements to downstream <br />MUSA infrastructure, such as the Anoka lift station, may be required at some future date. <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 RiverMUSA District— To determine the future wastewater flows, the Rum River <br />MUSA Sub -District has been divided into four sub -districts: the Existing MUSA Sub- <br />district, the Rural Sub -district, the Northwest MUSA Sub -districts and the Northeast <br />MUSA Sub -district (Figure 18.2). Table 18.6 shows the current and future flows for the <br />Rum River District. <br />18-9 <br />