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<br />n~2227 <br /> <br />Moore and Wood - 3 <br />Oral - GSA <br /> <br />. <br /> <br />. <br /> <br />An analog model is being used to determine the <br /> <br /> <br />relation of ground water to surface water and to predict <br /> <br /> <br />the effect of changes in water management. The model, <br /> <br /> <br />simulating a ISO-mile reach of the Arkansas Valley (Pueblo <br /> <br /> <br />to the State line). has a resistor spacing of 8 per mile. <br /> <br /> <br />The framework for the model was a transmissibility map: <br /> <br /> <br />transmissibility ranges from 50,000 to 700,000 gallons <br /> <br /> <br />per day per foot. The specific yield averages about 0.2. <br /> <br /> <br />Boundaries of the hydrologic system, such as the <br /> <br /> <br />Arkansas River, the irrigation canals, and the bedrock- <br /> <br /> <br />valley fill contact were simulated. Applied water, <br /> <br /> <br />precipitation, evapotranspiration, and ground-water <br /> <br /> <br />pumping were the independent variables programmed. The <br /> <br /> <br />model is being verified by comparing predicted changes <br /> <br /> <br />in water level and river discharge with observed changes. <br /> <br />J <br /> <br />. <br />