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Cl Introduction 2 Purpose and Scope  2 Physical Setting  3 Acknowledgments 4 Geologic Setting  6 Definition of Geohydrologic Characteristics Methodology  10 Geophysical Logs  11 Dissolved Solids  11 Hydraulic Head 13 Porosity 15 Hydraulic Conductivity and Intrinsic Permeability  16 Geohydrology 18 Plains Subregion 19 Western Interior Plains Aquifer System  19 Western Interior Plains Confining System  26 Great Plains Aquifer System  33 Overlying Units 35 Ozark Subregion 35 Ozark Plateaus Aquifer System  36 St. Francois Aquifer  36 St. Francois Confining Unit  41 Ozark Aquifer  43 Ozark Confining Unit 45 Springfield Plateau Aquifer  47 Simulation of Ground-Water Flow  47 Model Framework 48 Relation of Model Layers and Geohydrologic Units  48 Boundary Conditions of Model Layers  48 Layer 1  48 Layer 2  54 Layer 3  54 Layer 4  57 Layer 5  59 Simulation of Variable-Density Flow  59 Model Calibration 59 Calibration Criteria 59 Hydraulic Head  61 Effects of Variable Density  69 Recharge 72 Sensitivity Analysis  78 Error Analysis 81 Results of Simulations  86 Flow 86 Model Budget  95 Water Supply and Water-Storage Potential  97 Great Plains Aquifer System  97 Western Interior Plains Aquifer System  97 Ozark Plateaus Aquifer System  99 Summary 99 References Cited 103

u.s. geological survey professional papers/u.s. geological survey professional paper

Geohydrology and simulation of steady-state flow conditions in regional aquifer systems in Cretaceous and older rocks underlying Kansas, Nebraska, and parts of Arkansas, Colorado, Missouri, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming