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`~~ ESTIPIATE OF RUNOFF <br />PROPOSED ^tIIII'lG SITE - IJELD COUNTY, COLORADO <br />SITE CHARACTERISTICS <br />The watershed considered for this runoff estimate is outlined, along <br /> with the approximate limits of mining, in Figure 1. The line designated <br /> as "watershed boundary" is the boundary of the catchment area that v,i11 <br /> potentially produce runoff originating on or passing throunh the proposed <br /> mining area. As such, the watershed includes a small area upslope from <br /> the proposed mining area, the potential runoff from which will pass through <br /> the mining area unless diversions are constructed. The downslope boundary <br /> of the watershed is the downslope boundary of the proposed mining area. <br /> The general slope of the watershed is toward the northeast at an <br />t• average value of about 1.5 percent. Locally, the general slope is broken <br /> by numerous small mounds and closed depressions formed by wind erosion. <br /> There are no well-defined drainage channels that collect runoff from a <br /> significant area. In other words, there are no "drainage points" in the <br /> sense that locations where retention structures would obviously collect <br /> water cannot be identified. In fact, there is no evidence of surface <br /> runoff occurrence •.,ithin the watershed boundary shown in Figure 1. Tiie <br /> infiltration capacity of the deep, well-drained sands that mantle the <br /> area is, apparently, sufficient to prevent runoff. Prevention of runoff <br /> is further aided by the relatively great surface storage provided by the <br /> numerous closed depressions in the sand. <br /> The surface soils in the area consist chiefly of deep, well-drained <br /> sands with a high infiltration capacity. The land is currently used for <br /> <br /> pasture and is only intermittently grazed. <br />