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CENTER STREET AREA FRAMEWORK + POLICY PLAN <br /> Sto rmwate r Management System Piro e cit Y ' l e m e nlits <br /> lififfil'o,iffill:11;Ili <br /> I r.�wl ���o rw . are re et <br /> IIik. nurtser <br /> F vi ,m l[ <br /> �.,3 T <br /> Wev :: f . t u�r�r� � , Y 8 w �k � �� i <br /> Weeks, far rlow s Must. r��o of d , <br /> ° � � ��i �w�n �a�2 weeks <br /> _ �nrt u� <br /> Exhibit 1: Excerpt from the Met Council Reuse Water Balance Tool. <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 /> ff �, 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 /> ; <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 /> 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 /> t <br /> Exhibit 3: Example underground fiberglass storage <br /> tanks(Xerxes). <br /> 28 <br />