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<br />. <br /> <br />. <br /> <br />. <br /> <br />0:'2231 <br /> <br />Moore and Wood - 7 <br />Oral - GSA <br /> <br />We have selected a l2-mile reach of the valley as <br /> <br /> <br />an example to outline the techniques used to build and <br /> <br /> <br />evaluate the model. <br /> <br />DATA COLLECTION AND EVALUATION <br /> <br />The study was divided into two basic phases: <br /> <br /> <br />(I) the definition of the physical limits and characteristics <br /> <br /> <br />of the ground-water reservoir; and (2) the relations of <br /> <br /> <br />ground water, surface water, and climate. <br /> <br />Figure 2.--Geologic map of part of the valley. <br /> <br />On this map are defined the rocks that are aquifers <br /> <br />and those that act as barriers to ground-water movement. <br />The aquifer is shown in yellow and consists of gravel, <br />sand, silt, and clay of pleistocene The (; <br />to Recent age. <br />aquifer in this 12-mile reach averages 2 miles in width. <br />The va Hey fill re.sts in a U-shaped trough cut in bedrock. <br /> <br />The bedrock is shown in green, gray, and blue and <br /> <br /> <br />consists of shale and limestone of Late Cretaceous age. <br /> <br />Figure 3.--Hydrogeologic cross section. <br />