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1.4 Water Demand <br /> Existing water and projected 2040 water demands for each of the study area communities is presented <br /> in Table 1-1. In 2040, projected average daily water use by the entire study area is estimated to be 8 <br /> million gallons per day (MGD), while maximum day water demand is expected to be 22 MGD. <br /> The total study area population is expected to grow by about 250% by 2040. The 2040 projected water <br /> demands for Rogers are within their permitted well appropriation but Ramsey will exceed their current <br /> appropriation. Dayton and Corcoran are supplied water by Maple Grove and have water contracts <br /> through 2036 and 2038, respectively. Dayton has a current appropriation of 35 MGY and Corcoran <br /> currently has no permitted community drinking water wells. <br /> Table 1-1.Historic and Projected Population and Drinking Water Demand for Northwest Metro Communities. <br /> 2015 Avg 2040 Avg 015eO Max <br /> 2015 2040 ggMax DayDay <br /> city J[Population' Po ulation� Day Demand Day Demand emand Demand <br /> p (MGD)2 (MGD)3 3 3 <br /> (MGD) (MGD) <br /> Rogers 97400 20,050 1.3 2.5 2.9 6.2 <br /> Ramsey 13,774 26,988 1.8 3.5 4.5 10.3 <br /> Dayton I 17667 71317 0.2 0.7 0.4 1.9 <br /> Corcoran 48 71650 0.01 1.1 NA 3.4 <br /> Total 24,899 62,005 3.3 7.8 7.4 21.8 <br /> 'Served by Municipal Water System (estimated)-2DNR Water Appropriations database—3Community comprehensive plans. <br /> This concept level study requires projecting beyond the typical 20-year planning horizon. Communities <br /> provided their projections for buildout conditions and the potential "ultimate" water demand. The <br /> ultimate average annual demand is estimated to be around 30 MGD and the ultimate maximum day <br /> demand could be greater than 70 MGD. Table 1-2 provides the estimated ultimate demand provided by <br /> each community. <br /> Table 1-2.Ultimate Water Demand for Northwest Metro Communities. <br /> Ultimate Avg Ultimate Max <br /> Year Day Demand Day Demand <br /> (MGD) (MGD) <br /> Rogers 4.8 I 12 <br /> Ramsey 8.0 20 <br /> Dayton , 7.7 19.3 <br /> Corcoran 8.8 22 <br /> Total 29 73 <br /> Sources: Community provided based on ultimate growth projections. <br /> An important water infrastructure planning criteria is the ratio of maximum day water use to average <br /> day use. Peak demands occur during warmer months, and are mainly attributed to irrigation and <br /> outdoor water use needs. This ratio provides one method of assessing a community's water use <br /> efficiency. Table 1-3 summarizes the projected 2040 water demand and peak ratios. <br /> Page—3 1 METROPOLITAN COUNCIL <br />