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• e. Topography <br />Channelization in the Red Wash drainage is a typical alluvial <br />channel, with a channel and flood plain incised in the alluvium, <br />creating terraces. The meandering nature of the stream and the <br />confluence of smaller tributarieshave created a very Bisected <br />stream bottom (see Map 102). <br />f. Sub irrigation <br />Limited subirrigation of the alluvium at depth is indicated from <br />two areas. First, the xerophytic and deep-rooted species of the <br />big sagebrush-greasewood vegetative type are indicative of dry <br />surface moisture conditions with water available at considerable <br />• depth. The productivity of the vegetative type indicates that the <br />water available is limited and sporadic. Second, the groundwater <br />in bedrock tends to flow beneath the alluvium. This is indicated <br />by the better water quality in the alluvium. The tight sandstone <br />underlying the alluvium tends to perch the waters in the alluvium <br />creating separate systems. <br />g. Flood Irrigabili <br />Agricultural activities are absent on or adjacent to the mine permit <br />area within the Red Wash drainage. Flood irrigation reconnaissance <br />inventories were performed by staff members of Vaugh Hansen Associates <br />and Ford, Bacon, and Davis. The inventories reviewed all areas of <br />similar hydrologic, geologic, and biotic characteristics within <br />• about LO miles of the mine permit area. Visual inspection of <br />4/81 II.D-13 <br />