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Table 3.12 — Northwest Study Areas Storage Requirements <br />Year 2022 Year 2040 <br />A Average Day Water Use in gpd 26,966 512,349 <br />B Maximum Day Water Use in gpd 69,841 1,326,984 <br />C Maximum Day Water Use in gpm (20-hrs to supply per AWWA) 58 1,106 <br />D Firm Pumping Capacity in gpm 800 1,650 <br />E AVW1/A Recommended Firefighting Rate in gpm 3,500 3,500 <br />F Firefighting Duration in hours 3 3 <br />G Design Firefighting Volume in Gal (E x F x 60 min/hour) 630,000 630,000 <br />H Total Coincident Demand in gpm (C + E) 3,558 4,606 <br />I Required Draft from Storage in gpm (H - D) 2,758 2,956 <br />J Adjusted Firefighting Storage in gal (F x 60 min/hr x I) 496,440 532,080 <br />K Equalization Storage in gpd (B x 25%) 17,460 331,746 <br />L Total Storage Needed in gal (J + K) 513,900 863,826 <br />M Existing Storage Capacity in gallons 0 0 <br />N Storage Surplus/Deficit in gallons — Average Demand Method (M — A) -26,966 -512,349 <br />O Storage Surplus/Deficit in gallons — Equation 1 Method (M — L) -513,900 -863,826 <br />1.5 <br />0 <br />C� <br />� 1.0 <br />a� <br />E <br />� <br />0 <br />> <br />a� <br />� 0.5 <br />L <br />`�^ <br />VJ <br />0.0 <br />2022 <br />2024 2026 2028 2030 2032 2034 2036 2038 2040 <br />Date (yyyy) <br />� •Storage Capacity <br />� Storage Requirements - Average Day Demand <br />Storage Requirements - Equation 1 Method <br />Figure 3.7. Northwest Study Areas Storage Capacity Evaluation <br />3.7 Recommended Water System Infrastructure for the Northwest Areas <br />The proposed water distribution system to serve the northwest study areas is shown in Figure A13 in <br />Appendix A. A summary of the recommended infrastructure is described below: <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 12 <br />