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land uses for the ultimate northwest areas include single family residential, industrial, rural industrial, and <br />highway business, which are projected to require a significant volume of water. A summary of the projected <br />water demands for these land uses is shown in Table 3.8. The northeast study area is not projected to <br />develop beyond the boundary shown in Figure A1 and therefore the 2040 water demand projections <br />summarized in Table 3.6 can also be a representation of ultimate development conditions. <br />Table 3.8 — Projected Water Demand for Northwest Areas (Beyond 2040 Development Timeframe) <br />Land Use Type Net Developable Average Unit Water Water Demand <br />Acres Demand (gpd/acre) (gpd)�'> <br />Single Family Residential 196 435 85,260 <br />Industrial 478 1,000 478,000 <br />Rural Industrial 231 800 184,800 <br />Highway Business 428 900 385,200 <br />Average Daily Flow (gpd) 1,133,260 <br />Maximum Daily Flow (gpd) 2,935,144 <br />(1) Water demand fn additfon to the 2040 projectfons from Table 3.7. <br />3.4 System Evaluation and Capacity Analysis for Northeast Areas <br />Computer modeling indicated that the northeast study areas can be annexed to the system's existing main <br />pressure zone without creating a separate pressure zone. Therefore, the water supply, treatment, and <br />storage infrastructure of the existing main pressure zone was evaluated to assess if it is adequately sized <br />to supply water to the northeast areas. Since the rate of development for the northeast areas is unknown, <br />the water demands summarized in Table 3.6 were distributed linearly between now and the end of the <br />planning period. <br />The water supply capacity evaluation for the main pressure zone is depicted in Figure 3.2. As shown in the <br />figure, a new 850 gpm (1,224,000 gpd) well is being proposed in 2028 or at the time that demand <br />warrants to ensure the zone's firm pumping capacity exceeds its maximum day demand. The timeline to drill <br />this new well could vary depending on the rate of development of the northeast zone. ERMU should <br />continue to monitor maximum day demands closely and begin discussions to drill a new well if the main <br />zone's maximum day demands are consistently maintained between 4.0 and 4.4 MGD. <br />� <br />� 6.0 <br />� <br />� <br />� <br />� 4.0 <br />a� <br />0 <br />L <br />� <br />� 2.0 <br />0.0 <br />2022 <br />2024 2026 2028 2030 2032 2034 2036 2038 2040 <br />Date (yyyy) <br />< aFirm Pumping Capacity Projected Maximum Day Demand <br />Figure 3.2 — Main Pressure Zone Water Supply Capacity Evaluation <br />Feasibility Report <br />Northeast & Northwest Urban Service Area Expansion Study <br />City of Elk River, MN <br />WSB Project No. 020010-000 <br />Page 6 <br />