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a minimum, a system's water storage volume should exceed the system's average day demand according <br />to the Minnesota Department of Health (MDH). The main zone's storage facilities are summarized in Table <br />3.3. <br />Table 3.3 — Main Pressure Zone Existing Water Storage Capacity <br />Facility Name Facility Type Year Primary Capacity <br />Installed Material (gallons) <br />Auburn Street Elevated Storage 1993 Steel 500,000 <br />Johnson Street Elevated Storage 2002 Steel 1,500,000 <br />Total Storage Capacity 2,000,000 <br />3.2 Existing Water Demand <br />The system's main pressure zone historical water demands were analyzed using data provided by ERMU <br />staff for the years 2017 through 2021 and are shown in Table 3.4 and Figure 3.1. The main zone's water <br />demands have experienced a mild increasing trend over the past five (5) years likely due to population <br />g rowth . <br />Table 3.4 — Main Pressure Zone Historical Water Demands <br />Year Average Day Maximum Day Peaking <br />Demand (gpd) Demand (gpd) Factor <br />2017 1,277,079 2,965,000 2.32 <br />2018 1,231,567 2,890,000 2.35 <br />2019 1,098,255 2,856,000 2.60 <br />2020 1,318,686 3,697,000 2.80 <br />2021 1,509,232 4,286,000 2.84 <br />Average 1,287,000 3,339,000 2.59 <br />GPD — Gallons per Day <br />5.0 <br />0 4.0 <br />C� <br />� <br />� 3.0 <br />� <br />c� <br />� <br />p 2.0 <br />L <br />� <br />� 1.0 <br />0.0 <br />2017 <br />2018 2019 2020 2021 <br />Date (yyyy) <br />� �Hist. Maximum Day Demand Hist. Average Day Demand <br />Figure 3.1 — Main Pressure Zone Historical Water Demands <br />3.3 Water Demand Projections <br />Awaterdistribution system's average waterdemand can be 50 to 75 percent higherthan the same system's <br />average sanitary sewer flow. This difference in flow is typically associated to higher summer water usage <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 4 <br />