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CENTER STREET AREA FRAMEWORK + POLICY PLAN <br />Stormwater Management System Project Elements <br />SOURCE Site Data <br />Impervious Area <br />Impervious Area <br />83,417 square feet <br />1.91 ' acres <br />USE Demand Data <br />Irrigation Area <br />Irrigation Area <br />Irrigation Season <br />Storage Data <br />57,206 <br />square feet <br />1.31 acres <br />13 <br />39 iweek number <br />Storage Provided 150,000 ;gallons <br />Total Storage Required 454,037 gallons <br />Weeks that Flows Must be Augmented 85 weeks <br />Weeks that Reuse System will Meet Demand 752 weeks <br />q <br />10.2% <br />89.8% <br />Exhibit 1: Excerpt from the Met Council Reuse Water Balance Tool. <br />Exhibit 2: Example concrete vault storage tank <br />(Storm Trap). <br />Exhibit 3: Example underground fiberglass storage <br />tanks (Xerxes). <br />Exhibit 1 summarizes the preliminary reuse system <br />sizing. According to the reuse calculator, there will be <br />enough captured stormwater water in approximately <br />90% of the pumping season weeks to apply I -inch per <br />week of water over the area to be irrigated (a total of <br />454,000 gallons required). Since rainfall contributes to <br />that total, as well as stored water in that tank, the total <br />required volume per year does not translate to the size <br />of the tank required. Instead, the volume of the tank can <br />be modified to target an irrigation efficiency. <br />The storage volume could be a single concrete vault or <br />multiple fiberglass underground units. Given the size <br />of individual cisterns, plastic is not available. Fiberglass <br />tanks generally are available up to 50,000 gallons in size. <br />A 50,000-gallon tank has dimensions of approximately <br />68 feet long with a 12-foot diameter. Three tanks, with <br />space between, could fill a footprint of approximately <br />5,000 square feet. Concrete vaults can be sized to fit <br />multiple footprint sizes. <br />28 <br />