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JD -7 Mine — Drainage Design Plan <br />2.2.3.3 Regression Analysis <br />10 <br />A regression analysis was also performed to verify the WinTR -55 model results using regression equations <br />developed by the USGS for the southwestern U.S. (Thomas et al., 1997) and for western Colorado basins <br />(Kircher, et al., 1985). <br />The regression relations for western Colorado were developed by the USGS using measured discharge data <br />from 54 continuous - record gaging stations in the southwestern region of Colorado, including the Dolores <br />and San Miguel Rivers (Kircher, et al., 1985). The regression equations provide a method for estimating <br />mean annual discharge, peak flows, and other flow characteristics of gaged and ungaged drainages using <br />basin drainage area, mean annual precipitation, mean basin elevation, and mean basin slope. Discharge is <br />determined using the following regression relations: <br />Q = aAbl Pbz Eg b3 $g b4 <br />Where: Q = discharge (ft3 /s) <br />A = drainage area (mil) <br />P = mean annual precipitation -10 inches (in) <br />EB = mean basin elevation -5,000 ft /1,000 ft (ft) <br />SB = mean basin slope (ft/ft) <br />a, bl, b2, b3, b4 are regression coefficients (shown in Table 4) <br />4149A.140207 Whetstone Associates <br />