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• <br />Table 17-23 <br />Average Watershed Slope, Average Watershed Slope Length and <br />Time of Concentration in the 007 Pond Watershed for both <br />Pre- and Postmining Topographies <br />Drainage Basin Parameter <br />Area Average Watershed Average Watershed Time of <br />(acres) Slope (percent) Slope Length (ft) Concentration (hrs) <br />• <br />• <br />Premining <br />Topography 289 8.20 251 .731 <br />Pos tmini ng <br />Topography 308 6.70 318 .965 <br />17-75 Revised 04/11/88 <br />