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<br />., <br /> <br />. <br /> <br />. <br /> <br />.1 <br />, <br /> <br />2 <br /> <br />variations of water-bearing properties of the rocks from place to place. <br />We are then able to select 'the resistor and the capacitor at each point <br />on the grid that most nearly represents the water-bearing properties in <br />the field. When the electrical components are assembled on the big map <br />board, we have ~n electrical model that incorporates the same variations <br />found in the underground water system." <br /> <br />The first version of the model will be completed in February after which <br />a lengthy testing period is scheduled. The testing involves running <br />electricity through the model, metering its inflow and outflow, and <br />measuring changes in voltage at selected points on the model. The inflow <br />of electrical current corresponds with past records of recharge and the <br />outfl(1W 0f curn>nt corresponds 'With the discharge of ~rollnd water from <br />wells, seeps, Jnu springs. The change in voltage at points on the map <br />corresponds with changes in water levels in wells. Commonly, the first <br />test of the model reveals discrepancies between model results and <br />observations in the field. Therefore, a series of adjustments are made, <br />based on new data and revised interpretations of old data until the model <br />~ccurately duplicat~s field conditions. <br /> <br />When the model duplicates known field conditions, it will be used to <br />make predictions. For example, the extent and rate of the lowering of <br />water levels from pumping water in the Valley "sump area" can be <br />estimated or the effects of developing additional water from wells in <br />new areas can be predicted. The analysis also will show the effects on <br />streamflow from changes in water use", <br /> <br />The analog model is capable of sirnulatinl-!,t in an instant, histo:rical <br />changes covering a day, a month, or many years. One must remember, <br />however, that the results ore only as good as the hydrologic data and <br />~I.ssllml-lt ions used in the modeling procccillrC!~ Rpcognizing this fact, the <br />hydrologists m~lk(~ eVl'ry .1tt('mpt to collc'ct accurote nnd comrlc.tt. do to <br />and to double check their scientific analyses. <br /> <br />Survey hydrologists expect the model will be complete enough to provide <br />roubh predictions within a year~ Continued data collection will further <br />verify the model and provide the basis for more refined predictions. <br />In onother two or three years, the model should be capable of answering <br />most of the questions likely to be asked by water planners and managers, <br /> <br />/' <br />cn~ <br />-_.~ <br />