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• ~ • <br /> TABLE 7.29 <br /> Premining Geomorphic Parameters for Basins to be Affected by Mining <br /> and Proximate Adjacent Basins <br /> Annand 011 Y1 Y2 Y3 Methodology <br />Parameter Unit/Equation Drew Drew Drew Drew Drew Reference <br /> l <br />Va[ershed Aree mi 1.59 0.226 0.50 0.08 0.27 N/A <br />Longest Stream Channel mi 2.71 0.76 1.55 0.54 0.597 N/A <br />Elevation Change of <br />Longest Channel ft 1130 580 710 370 500 N/A <br />Valley Length mi, length parallel 2.69 0.73 1.515 0.53 0.56 1 <br /> to mein drainage <br />Elevation Change for Basin (2) ft <br />Length of all Channels mi <br />Na1n Channel Gradient (Upper) ft/ft <br />(Lower) ft/ft <br />Drainage Density mi/mi2,Lenuth of aLl Channels <br />Drainage Aree <br />Sinuosity of Longest Channel mi/mi, Longest Steam Channel <br />Valley Length <br />Basin Length mi, longest diameter or'length <br />parallel to main drainage <br />Lemniscete Ratio mil/mil, basin length2 <br />4 x drainage area <br />Constant Of Channel Meintenenee mil/mi, 1 <br />Drainage Density <br />1190 900 720 370 600 N/A <br />12.86 2.33 4.53 0.83 1.96 N/A <br />0.116 0.174 0.094 0.163 0.218 M/A <br />0.039 0.114 0.082 0.067 0.093 N/A <br />8.09 10.31 9.06 10.38 7.26 2 <br />1.01 1.04 1.03 1.02 1.07 3 <br />2.7 0.795 1.57 0.496 0.716 1 <br />1.15 0.70 1.23 0.77 0.47 1 <br />0.12 0.097 0.11 0.096 0.138 2 <br />m <br />