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IX. SANITARY SEWER SYSTEM <br />Sanitary Sewer Systems <br />Figure 14 shows existing sanitary sewer systems as of 1990 <br />and indicates the proposed development schedule for <br />extending sewer in the 2000 MUSA areas. Each area is <br />identified alphabetically and can be cross referenced to <br />Tables 12 and 13. <br />Table 12 provides a projection of wastewater flows for the <br />Mississippi River Watershed through the year 2000. As <br />indicated, Table 12 residential flow in this watershed is <br />relatively low with a projected ultimate flow of 0.041 <br />million gallons day (mgd) or 14.97 million gallons per year. <br />This watershed is zoned predominantly for industrial use, <br />thus the heaviest contributor to wastewater flows in this <br />watershed will be industrial users. The total projected <br />flow for all land uses for the year 2000 is 0.668 mgd or 243 <br />million gallons /year. <br />Table 13 provides a projection of wastewater flows for the <br />Rum River Watershed through the year 2000. As indicated, <br />residential land use will be the primary contributor to <br />these flows with approximately 96% of the total flow <br />projected for the year 2000. Residential flow is projected <br />to be 0.341 mgd with total projected flow of 0.356 mgd <br />(129.9 million gallons per year). <br />Table 14 summarizes the developed and undeveloped acreage by <br />watershed as of 1989 and estimates the development area for <br />the 2000 MUSA. As indicated, the developed acreage within <br />the sewered area of both watersheds is projected to double <br />by the year 2000. The estimated project that approximately <br />80% of the net developable acreage within the 2000 MUSA <br />would be developed by the year 2000. <br />Estimated wastewater flows for each watershed are <br />illustrated by year through 2000 on Tables 15 and 16 and are <br />summarized in Table 17. The estimated flow in 1989 was <br />0.076 mgd or approximately 28 million gallons per year. For <br />1990, the MWCC estimates 0.10 mgd flow. <br />Figure 15 illustrates the existing sewered area within the <br />City and proposed sanitary sewer trunk extensions with a <br />schedule for trunk extensions. <br />Wastewater flow for both watersheds is treated at the Anoka <br />treatment plant with a rated capacity of 2.46 mgd. The <br />Anoka plant is being phased out with flows diverting to the <br />Metropolitan treatment plant via the. Champlin- Anoka- Brooklyn <br />Park interceptor. <br />43 <br />