Laserfiche WebLink
The water storage capacity analysis completed for the northeast areas annexing to the main pressure zone <br />is summarized in Table 3.9 and depicted in Figure 3.4. Given the requirements shown below, it is <br />recommended to construct a 1.0 MG water tower within a ten (10) to fifteen (15) year timeframe in 2033. <br />Table 3.9 — Main Pressure Zone Storage Requirements <br />Year 2020 Year 2040 <br />A Average Day Water Use in gpd 1,318,686 2,033,315 <br />B Maximum Day Water Use in gpd 3,697,000 5,266,286 <br />C Maximum Day Water Use in gpm (20-hrs to supply per AWWA) 3,081 4,389 <br />D Firm Pumping Capacity in gpm 3,400 4,250 <br />E AVWVA 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) 6,581 7,889 <br />I Required Draft from Storage in gpm (H - D) 3,181 3,639 <br />J Adjusted Firefighting Storage in gal (F x 60 min/hr x I) 572,580 655,020 <br />K Equalization Storage in gpd (B x 25%) 924,250 1,316,572 <br />L Total Storage Needed in gal (J + K) 1,496,830 1,971,592 <br />M Existing Storage Capacity in gallons 2,000,000 2,000,000 <br />N Storage Surplus/Deficit in gallons — Average Demand Method (M — A) +681,314 -33,315 <br />O Storage Surplus/Deficit in gallons — Equation 1 Method (M — L) +503,170 +28,408 <br />4.0 <br />0 <br />(� 3.0 <br />� <br />a� <br />E <br />0 2.0 <br />> <br />a� <br />� <br />c� <br />0 1.0 <br />� <br />0.0 � <br />2020 <br />Date (yyyy) <br />� � •Storage Capacity <br />� �Storage Requirements - Average Day Demand <br />Storage Requirements - Equation 1 Method <br />Figure 3.4. Main Pressure Zone Water Storage 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 8 <br />2022 2024 2026 2028 2030 2032 2034 2036 2038 2040 <br />