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2.04.5 General Description of Geology and Hydrology <br />Ground Water <br />The occurrence of ground water in the permit and adjacent area is controlled <br />mostly by irrigation water and the Colorado River. Alluvial groundwater in the <br />permit area occurs in river alluvium that lies over Mancos shale. The river <br />alluvium is well graded sandy gravel that were deposited in terraces. These <br />terraces are areas of relatively flat land (located on either side of the flood plain) <br />which are above the flood plain because of river erosion over the years down <br />cutting below the level of the terraces. <br />Along the banks of the Colorado River, the alluvium is directly impacted by flows <br />in the river. Within the permit boundary, the alluvial water appears to be a result <br />of groundwater flow from upland irrigation. <br />Permit Application 2.04 -8 04/11 <br />