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Storage Calculation <br /> Proposed Storage in Basins (100-Year Volume) <br /> Basin 1 <br /> High Water Level 11,595 sf <br /> Bottom of basin 2,982 sf <br /> Depth of water 5 ft <br /> Volume of Basin 36,443 cf <br /> Basin 2 <br /> High Water Level 5,677 sf <br /> Bottom of basin 844 sf <br /> Depth of water 5 ft <br /> Volume of Basin 16,303 cf <br /> Total Volume in Basins 52,745 cf <br /> Required Volume in <br /> French Drain 22,627 cf <br /> Proposed Storage in French Drain (100-Year Volume) <br /> Trench Height 7.5 ft. <br /> Trench Width 6.5 ft. <br /> Inner Storage Pipe 48 in. <br /> Outer Storage Pipe 52 in. <br /> Length of Trench 900 LF <br /> Volume in Pipe 11310 cu.ft. <br /> Volume in Trench 11398 cu.ft. ((HxWxL)-Pipe Volume)x35% <br /> Subtract Solid Pipe 1964 cu.ft. <br /> Total Volume 22,708 cuff Checks O.K. <br /> GDR Engineering, Inc. Onsite Storage <br />