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<br />OGQJo~'. <br /> <br />Hydrologic and hydrogeologic information on the aquifer, stream- <br />flow, and recharge are built into the model to simulate the system, The <br />types of information needed to build a model can be classified into two <br />categories, These are field data to (1) define the physical framework <br />and (2) describe the hydrologic stress on the system. A summary of the <br />data requirements for a,prediction model is given in table 1. This <br />tabulation should be considered as only a general guide for data collection. <br />Different types of hydrologic data will be needed for various types of <br />ground-water studies, Data requirements will differ for a ground-water <br />mining problem, a leaky-artesian aquifer, a multiaquifer system, a salt- <br />water intrusion problem, a water-salvage study, or a subsidence problem. <br /> <br />Table l.--DATA REQUlRE~lliNTS FOR PREDICTION MODEL <br /> <br />PHYSICAL FRAMEWORK <br /> <br />1. Hydrogeologic map showing areal extent and boundaries of all aquifers. <br />2. Topographic map showing surface-water bodies, <br />3, Water-table, bedrock-configuration, and saturated-thickness maps. <br />4. Transmissivity map showing aquifer and its boundaries. <br />5, Map showing variation in storage coefficient of aquifer. <br />6, Relation of saturated thickness to transmissivity. <br />7. Relation of stream and aquifer (hydraulic connection). <br /> <br />HYDROLOGIC STRESS <br /> <br />1. Type and extent of recharge areas (irrigated areas, recharge basins, <br />recharge wells, etc.), <br />2. Surface-water diversions. <br />3. Ground-water pumpage (distribution in time and space), <br />4. Depth to water map, keyed to evapotranspiration rate. <br />5. Tributary inflow (distribution in time and space), <br />6. Ground-water inflow and outflow. ' <br />7. Precipitation, <br />8. Areal distribution of water quality in aquifer. <br />9, Streamflow quality (distribution in time and space). <br /> <br />MODEL CALIBRATION <br /> <br />1, Water-level change maps and hydrographs, <br />2, Streamflow (including gain and loss measurements). <br /> <br />PREDICTION AND OPTIMIZATION ANALYSIS <br /> <br />I, Economic information on water supply. <br />2, Legal and administrative rules. <br />3, Environmental factors. <br /> <br />7 <br />