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i <br />TA6LE 4 <br />SEDIi1EUT PO~JDS <br />SEDIi~iEilT AP1D FLOOD VOLUFiES <br /> <br /> <br /> 10-year, 24-hour Runoff Sediment* Pond <br /> Drainage area Runoffl Volume Volume Size <br />Pit (acres) (inches) ac.ft. ~ac.ft. ac.ft. <br />4 139.9 .70 8.16 .4G 8.62 <br />S & u 47.7 .70 2.73 .17 2.95 <br />*fJOTE: for disturbed areas, the SCS has recommended against using the USLE. <br /> Sediment volwne was calculated based on average annual run off of <br /> inches/year, an assumed sediment load of 10,000 mg/1 year round and <br /> the drainage area of each pit. Sediment volwne is compute d in acre- <br /> feet/year, asswning a denisty of 80 pcf. <br />1. Determined using a Cy of 86 for the mine pits and a 10-yea r 24-hour <br /> rainfall of 1.80 inches. <br />2-8~ <br />III-21 <br />