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JBird Mine Stormwater Design TR55 Retention Basin Volume Calculations <br />Retention Basin Volume Calculations <br />Retention Basin i <br />100 yr Runoff Volume = 4065 cult <br />Depth X Length at 1 ft Y Length at 1 ft Area at 1 ft X Length at base Y Length at base Area Flat Slope Area Volume at Depth (cuft) Total Volume at Depth (cult) <br />1 66 16 1056 60 10 600 228 828 828 <br />2 72 22 1584 66 16 1056 264 1320 2148 <br />3 78 28 2184 72 22 1584 300 1884 4032 <br />3.25 79.5 29.5 2345.25 78 28 2184 80.625 566.15625 4598 <br />Basin Dimension = 79.5 ft x 29.5 ft with 3H:1V side slopes at 3.25 feet deep provides 4598 cuft of Volume Capacity for 4065 cuft of runoff during 100-yr 24-hr runoff event <br />Retention Basin 2 Alternative 3 <br />100 yr Runoff Volume = 15485 cuft <br />Depth X Length at 1 ft Y Length at 1 ft Area at 1 ft X Length at base Y Length at base Area Flat Slope Area Volume at Depth (cult) Total Volume at Depth (cuft) <br />1 55 25 1375 49 19 931 222 1153 1153 <br />2 61 31 1891 55 25 1375 258 1633 2786 <br />3 67 37 2479 61 31 1891 294 2185 4971 <br />4 73 43 3139 67 37 2479 330 2809 7780 <br />5 79 49 3871 73 43 3139 366 3505 11285 <br />6 85 55 4675 79 49 3871 402 4273 15558 <br />Basin Dimension = 85 ft x 55 ft with 3H:1V side slopes at 6 feet deep provides 15558 cuft of Volume Capacity for 15485 cuft of runoff during 100-yr 24-hr runoff event <br />Retention Basin 3 <br />100 yr Runoff Volume = 221 cuft <br />Depth X Length at 1 ft Y Length at 1 ft Area at 1 ft X Length at base Y Length at base Area Flat Slope Area Volume at Depth (cuft) Total Volume at Depth (cuft) <br />1 40 10 400 34 4 136 132 268 268 <br />Basin Dimension = 40 ft x 10 ft with 3HAV side slopes at 1 feet deep provides 268 cuft of Volume Capacity for 221 cuft of runoff during 100-yr 24-hr runoff event <br />JBird Mine Stormwater Design 01/13/09 Gault Group Inc.