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Surface Water <br /> Effects of Mining on the Local Geomorphology. Mining impacts to the local geomorphology <br /> in the vicinity of the Nucl a Mine and Nucl a East mining area can be grouped under two <br /> categories: 1) Impacts to stream channels; and 2) Impacts to drainage basins. Surface <br /> mining affects streams channels by disrupting natural stream courses and reestablishing <br /> (via reclamation) different stream lengths and gradients. Drainage basin impacts may <br /> include changes in such basin parameters as watershed area, slopes and slope lengths. <br /> The West Return Ditch (see Exhibit 7-1, Tab 7) is the only prominent stream channel <br /> impacted (geomorphically) in the vicinity of the Nucla Mine. Impacts to this channel are <br /> limited to the reach from the 001 pond to a point about 250 yards upstream of Site SW-N6. <br /> Mining activities altered this channel reach beginning in the mid-1970's, and reclamation <br /> 17-68a Revised 10/07/88 <br />