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• TABLE OF CONTENTS <br />INTRODUCTION ................................................................. .........................................................1 <br />EXISTING STREAM CHANNEL CHARACTERISTICS ...... .........................................................1 <br />BASIN HYDROLOGIC CHARACTERISTICS ..................... ......................................................... 2 <br />Average Annual Runoff ............................................ .........................................................2 <br />Peak Runoff Rates ................................................... ......................................................... 3 <br />Sediment Yield ......................................................... ......................................................... 3 <br />STREAM CHANNEL HYDRAULIC CHARACTERISTICS ...........................................................3 <br />IMPACTS OF SUBSIDENCE ON STREAM CHANNELS ............................................................4 <br />CHANGES IN STREAM CHANNEL HYDRAULIC CHARACTERISTICS ...................................6 <br />CHANGES IN SEDIMENT YIELD ................................................................................................ 6 <br />SUMMARY ......................................................................... ..........................................................6 <br />REFERENCES ................................................................... ..........................................................7 <br />LIST OF TABLES <br />Table 1: Basins Potentially Impacted by Mining <br />• Table 2: Basin Hydrologic Characteristics <br />Table 3: Pre-Mining Stream Channel Hydraulic Characteristics <br />Table 4: Effects of Subsidence on Stream Channels <br />Table 5: Post-Mining Stream Channel Hydraulic Characteristics <br />0 <br />Tetra Tech i