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Introduction 1 Objectives 1 Previous investigations 1 Acknowledgments 2 Areas of study 2 Physical setting 2 Climate 2 Land use 7 Geology 8 Soils 8 Bear Creek basin 8 Turkey Creek basin 9 Hydrology 9 Surface water 10 Ground water 12 Description of precipitation-runoff model 13 Hydrologic system 13 Evapotranspiration 16 Infiltration and percolation 16 Runoff 16 Partitioning 16 Output 17 Data collection 17 Bear Creek basin 17 Turkey Creek basin 17 Calibration and verification 18 Bear Creek 18 Partitioning 18 Initial parameter and variable values 19 Calibration 20 Daily calibration 20 Storm calibration 24 Verification 25 TUrkey Creek 30 Partitioning 30 Daily calibration 33 Verification 35 Storm calibration 36 Significant calibration parameters 36 Transfer of calibrations 38 Summary and conclusions 40 Selected references 40 Metric conversion factors 42 Contents III Contents V

Introduction 2 Purpose and scope 4 Physical setting of study area 4 Physiography 4 Climate 4 Ground-water use 6 Previous investigations 6 Well and surface-water station numbering systems 7 Approach and methods of study 7 Mean-annual baseflow analysis 8 Drought-flow analysis 10 Conceptual model of ground-water flow and stream-aquifer relations 11 Hydrologic setting 12 Ground-water system 12 Geology 13 Hydrogeology 13 Ground-water levels 19 Surface-water system 21 Ground-water discharge to streams 24 Mean-annual baseflow 24 Drought flow for 1941, 1954, and 1986 28 Ground-water utilization and general development potential 41 Summary 42 Suggestions for further study 43 Selected references 44 in VI GLOSSARY 7Q2 Minimum average stream discharge for 7 consecutive days for a 2-year recurrence interval. Alluvium Sediment transported and deposited by flowing water.

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The report is a reference source on hydrologic information related to coal-mining activities in the Warrior and Plateau coal fields of Alabama. It contains a bibliography of more than 200 references and selected annotations. Also included is information on maps, automateddata bases, water-monitoring programs, and data-source agencies and organizations.