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CONTENTS <br />Abstract ................................................................................................................................................................................. <br />Introduction ........................................................................................................................................................................... <br />Purpose and scope :...................................................................................................................................................... <br />Acknowledgments ....................................................................................................................................................... <br />Environmental setting ........................................................................................................................................................... <br />Physiography ............................................................................................................................................................... <br />Climate ........................................................................................................................................................................ <br />General geology .......................................................................................................................................................... <br />General soils ................................................................................................................................................................ <br />Ecoregi ons ................................................................................................................................................................... <br />Population ..........................................................................................................................................:........................ <br />Land use ...................................................................................................................................................................... <br />Water management ...................................................................................................................................................... <br />Water use ..................................................................................................................................................................... <br />Hydrologic characteristics ........................................................................................................................................... <br />Surface water ..................................................................................................................................................... <br />Annual and monthly flow characteristics ......................................................................:......................... <br />Floods and droughts ................................................................................................................................ <br />Human effects on streamflow .................................................................................................................. <br />Ground water ..................................................................................................................................................... <br />Unconsolidated aquifers .......................................................................................................................... <br />Bedrock aquifers ..................................................................................................................................... <br />Water movement ..................................................................................................................................... <br />Stream-aquifer relations .................................................................................................................................... <br />Aquatic biological characteristics .........................:..................................................................................................... <br />Implications of environmental setting on water quality ........................................................................................................ <br />Natural factors ............................................................................................................................................................. <br />Human factors ............................................................................................................................................................. <br />Sumtnary ............................................................................................................................................................................... <br />References cited .................................................................................................................................................................... <br />FIGURES <br />1-9. Maps showing: <br />1. Location of the Upper Colorado River Basin study unit, physiographic provinces, major streams, <br />and selected surface-water stations ............................................................................................................. <br />2. Average annual precipitation (1951-80) in the Upper Colorado River Basin study unit ........................... <br />3. Generalized bedrock geology of the Upper Colorado River Basin study unit ........................................... <br />4. Major tectonic features of the Upper Colorado River Basin study unit ..................................................... <br />5. Soil associations in the Upper Colorado River Basin study unit ................................................................ <br />6. Ecoregions of the Upper Colorado River Basin study unit ........................................................................ <br />7. Population density in the Upper Colorado River Basin study unit ............................................................. <br />8. Major land use in the Upper Colorado River Basin study unit ................................................................... <br />9. Major interbasin water transfers, water diversions, reservoirs, and municipal discharges in the <br />Upper Colorado River Basin study unit ...................................................................................................... <br />10-12. Graphs showing: <br />] 0. Mean annual streamflow at selected surface-water stations in the Upper Colorado River Basin <br />study unit .................................................................................................................................................... <br />1 ] . Mean monthly streamflow at selected surface-water stations in the Upper Colorado River Basin <br />study unit .................................................................................................................................................... <br />12. Streamflow probability of exceedance and nonexceedance at selected surface-water stations in the <br />Upper Colorado River Basin study unit ...................................................................................................... <br />1 <br />3 <br />3 <br />3 <br />3 <br />3 <br />9 <br />11 <br />11 <br />14 <br />14 <br />14 <br />18 <br />18 <br />20 <br />20 <br />20 <br />24 <br />24 <br />26 <br />26 <br />26 <br />26 <br />28 <br />28 <br />29 <br />31 <br />31 <br />2 <br />4 <br />6 <br />8 <br />9 <br />12 <br />13 <br />15 <br />16 <br />21 <br />22 <br />23 <br />CONTENTS V <br />