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... '" "'l I ....0 ' 1..1<:" ",'.I J ' ~ l .- '" BIBLIOGRAPHY OF WATER-RELATED STUDIES, SOUTH PLA TIE RIVER BASIN--COLORADO, NEBRASKA, AND WYOMING BY KEVIN F. DENNEHY AND JORGE R. ORTIZ-ZAYAS ABSTRACT This collection of more than 1,270 bibliographic references focuses on the numerous environmental factors that affect water quality in the South Platte River basin. This publication is the first product of the U.S. Geological Survey's National Water-Quality Assessment program in the South Platte River basin. To aid in conducting a water-quality assessment for the basin, sources of water-related studies were compiled from computerized literature searches of biologic, chemical, geologic, and hydrologic data bases. Categories of information include: aquatic biology, atmospheric deposition, climate, geology, land use, runoff, sedimentation, surface- and ground-water hydrology, urban runoff, water chemistry, water quality, and water use and management. References date from 1845 through October 1991. The bibliography includes, in some instances, abstracts of the subject reference. Coauthor and subject indices also are included. INTRODUCTION In 1991, the U.s. Geological Survey (USGS) began to implement a full-scale National Water- Quality Assessment (NAWQA) program. The long-term goals of the NAWQA program are to describe the status and trends in the quality of a large, representative part of the Nation's surface- and ground-water resources and to provide a sound, scientific understanding of the primary natural and human factors affecting the quality of these resources. In meeting these goals, the program will produce a wealth of water-quality information that will be useful to policy makers and managers at the Federal, State, and local levels. A major design feature of the NAWQA program is the integration of water-quality information at different areal scales. The principal building blocks of the program are the study-unit investigations on which the national-level assessments are based. The 60 study-unit investigations that compose the program are hydrologic systems that include parts of the Nation's major river basins and aquifer systems. These study units include areas ranging from about 600 (Oahu) to about 67,000 (Central High Plains) square miles and include about 60 to 70 percent of the Nation's water use and the population served by public water supply. In 1991, the South Platte River basin was among the first 20 NAWQA study units selected for study under the full-scale implementation plan. ABSTRACT 1