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CENTER STREET AREA FRAMEWORK + POLICY PLAN <br /> Stormwater Management System Project Elements <br /> . - • <br /> III Mr ti ®•.:� Area 83,417 <br /> fit <br /> 1,91 acres <br /> -I go ILI on Sea sofa 13 A ]week nornber <br /> m <br /> ��a :::.�:� .� 1�d 4:Z.-6 3 7 gallons I <br /> r' �,'• '� F Io vis I1 11e-life -Yee s <br /> Wee '.�.._ _ ' __. s I le n, ,'. _ <br /> Exhibit 1: Excerpt from the Met Council Reuse Water Balance Tool. <br /> Exhibit 1 summarizes the preliminary reuse system <br /> 1 A14 <br /> L— <br /> sizing.According to the reuse calculator,there will be <br /> •1' 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 /> LN <br /> i` 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 t target an irrigation efficiency. <br /> � The storage volume could be a single concrete vault or <br /> Exhibit2: Example concrete vault storage tank multiple fiberglass underground units. Given the size <br /> (Storm Trap). of individual cisterns, plastic is not available. Fiberglass <br /> NIM."Wf tanks generally are available up to 50,000 gallons in size. <br /> 1 <br /> A 501000-gallon tank has dimensions of approximately <br /> An <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 /> ary <br /> multiple footprint sizes. <br /> ' c f - <br /> IL <br /> Exhibit 3: Example underground fiberglass storage <br /> tanks(Xerxes). <br /> 28 <br />