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Mr. Michael Grochala <br />April 8, 2020 <br />Page 6 <br />All three scenarios will trigger the need for additional municipal water supply infrastructure. The <br />additional wells and storage needed are summarized in Table 4. The storage needs assume that <br />Water Tower No. 3 (1.5 MG) will be constructed and in use by the time of development. <br />Table 4. Supply and Storage Summary <br />Existing <br />System <br />With <br />Scenario 1 <br />With <br />Scenario 2 <br />With 2030 <br />Comp Plan <br />Average Day Demand (MGD) <br />1.42 <br />3.74 <br />3.91 <br />2.94 <br />Maximum Day Demand (MGD) <br />3.98 <br />10.78 <br />11.25 <br />8.54 <br />Additional Wells Required <br />N/A <br />3 to 4 <br />3 to 4 <br />2 <br />Additional Storage Required (MG) <br />N/A <br />0 to 0.3 <br />0 to 0.4 <br />N/A <br />The City's existing authorized appropriation volume is 900 million gallons per year (MGY), and <br />the City's historical water use from 2014-2018 was 470 MGY. All three scenarios are projected to <br />increase the annual water use beyond 900 MGY. Therefore, the City will likely require an <br />amendment to its appropriation volume prior to full build out of the study area. The City's <br />historical water use shows a decreasing trend in per capita use, which will likely decrease these <br />projections by the time of development. <br />Water Demand Projection Comparison <br />Table 5 summarizes the projected average water demands from the 2005 Original AUAR and this <br />2020 AUAR Update for the scenarios outlined above. <br />Table 5. Comparison of Averaae Water Demand Proiections <br />Scenario <br />2005 Original <br />AUAR <br />2020 AUAR <br />Update <br />Scenario 1 <br />1.86 MGD <br />2.32 MGD <br />Scenario 2 <br />2.45 MGD <br />2.49 MGD <br />Scenario 3 <br />2.61 MGD <br />N/A <br />2030 Comp Plan <br />N/A <br />1.52 MGD <br />The projected water demands have remained within the parameters discussed in the original <br />AUAR. The expansion and layout of the water supply system will generally conform to the layout <br />identified in the 2005 Original AUAR. The 2005 Original AUAR identified the need for 1.0 MG of <br />additional storage, approximately four additional wells, and trunk and lateral watermains. Water <br />Tower No. 3 (1.5 MG) is currently under construction, and this AUAR Update reiterates the need <br />for three to four additional wells. Computer modeling completed as part of the City's 2040 <br />Comprehensive Plan Update confirmed the adequacy of the planned 16-inch trunk watermain <br />loop. <br />KA015144-000\Admin\DOCSWUAR -Update 2020\Water Wastewater\MEMO - 040820-Water.docx <br />