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HENDEL HOMES <br /> LOT 3, BLOCK 1, MOONEY LAKE PRESERVE <br /> EAST RAIN GARDEN CALCULATIONS <br /> October 11, 2017 <br /> Proposed hardcover = 4,050 SF <br /> 4,050 SF X 1"runoff- 12"/1' = 338 CF required <br /> Proposed rain garden = 1000 CF <br /> ELEV(FT) AREA(SF) VOL(CF) <br /> 993.0 1300 <br /> > 1000 <br /> 992.0 700 <br /> Drawdown = 12" 0.3 in/hr for B soils = 40 hours <br /> GRONBERG&ASSOCIATES.INC. <br /> 445 N.WILLOW DR. <br /> LONG LAKE,MN 5535E <br />