From introduction: "The U.S. Geological Survey began a 5-year study of the High Plains regional aquifer during the 1978 to provide the hydrologic information needed for the development of computer models to evaluate the aquifer's response to ground-water management alternatives." It contains maps, graphs, and tables.

From introduction: This report relates to the first of the above objectives by describing stream quality in the Yampa River basin through 1976, with particular emphasis on conditions from August 1975 through September 1976. The content of this report is, at times, relatively technical. This is intentional. The report is aimed not at planners and decision makers but rather at those persons assigned the task of having to design, implement, and interpret a river basin assessment. The techniques and procedures used to determine ambient stream quality in the Yampa River basin have been presented in detail so that their applicability to other river basins can be determined. For the planner and decision maker, the results presented in this report are summarized in less technical terms in phase-l (Steele and others, 1979) and phase-ll summary reports.

From introduction: The purpose of the investigation was to identify and describe the hydrologic units and to evaluate the availability and chemical quality of groundwater in the 1,100 square mile study area.

From abstract: This report provides "a hydrologic analysis of the proposed Badger-Beaver Creeks artificial-recharge project . . . made with the aid of three digital computer models." It includes maps, graphs, and tables.

From abstract: This report studies a group of wetlands in the Cottonwood Lake area in Stutsman County to explore "the role of lakes and wetlands in the hydrology of the prairie environment." It contains maps, graphs, and tables.

This report describes "a method for estimating flow characteristics of flood hydrographs between Portland, Colorado, and John Martin Reservoir." It contains maps, graphs, and tables.