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Development of extensive coal, oil, gas, trona, and oil-sha.le resources as well as other developments in the Green River and Great Divide Basins will require a projected increase in water consumption of 490,000 acre-ft (600 hm3 ) per year by 2020. Developments of energy resources in other parts of Wyoming will also require large amounts of water; transbasin diversion of Green River water to other areas could total an additional 270,000 acre-ft (330 hm3 ) per year. In anticipation of this increased demand, water planners and managers need much nore information about available ground and surface waters, present quality of the waters, and hydrologic effects that would be caused by development of energy resources. The U.S. Geological Survey is conducting an extensive hydrologic study of the basins. This report summarizes the study plan and discusses particular methods of approach that would be utilized in the study. The principal objectives of the study are: 1) To describe the water resources and hydrologic relations that presently exist; 2) to develop predictive methods that can be used to describe future conditions, including reactions to increased water development; and 3) to establish monitoring programs for detecting possible changes in water conditions. The most up-to-date methods available are being utilized to collect and analyze the hydrologic data. Regarding water quality, particular attention is being given to trace metals, biological characteristics, and trend analyses of salinity. Channel-geometry techniques, detailed statistical analyses, and mathematical models are being applied to surface-water studies. An updated well inventory, aquifer tests, and borehole and surface geophysical surveys are being used in ground-water studies. Efforts will be made by the U.S. Geological Survey to coordinate this study with the needs of the prospective users of the results, including industries and government agencies. INTRODUCTION Description of the Problem Water demands in the Green River and Great Divide Basins of Wyoming are increasing rapidly due to development of extensive coal, oil, gas, uranium, and trona resources. The potential also exists for future development of extensive oil-shale resources. As these developments proceed, large supplies of water will be needed at widely separated parts of the basins for recovery and utilization of the resources, for municipal supplies, and for recreation. The importance of water to the economic and social development of the area requires that careful attention be given to planning for the optimum control, conservation, and use of this resource. Water planners and managers need much more information than is now available concerning ground and surface waters, present quality of the waters, and hydrologic effects caused by development of mineral resources. Scope of the Investigation The U.S. Geological Survey is conducting a study of water resources in the Green River and Great Divide Basins. The study began in November 1974 and is scheduled to continue through 1979. The study is designed to provide interested persons with up-to-date information concerning water resources of the area. This information is especially neede-1 by decisionmakers and planners who must make judicious decisions regarding development and use of this land and its natural resources. Results of the study would provide sound background information for rational, wellconsidered decisions among alternative or competing uses of water and related land resources. This report presents: 1) Objectives of the study; 2) a general description of the study area, including its mineral and water resources; 3) a summary of existing data and knowledge of the water resources of the area; 4) a detailed description of the study plan; and 5) a schedule of reports to be prepared by the study group. This report was prepared so that decisionmakers, planners, and others interested in the subject area may be made aware of the study. Comments regarding the proposed methods of approach are invited from interested persons. Efforts will be made by the U.S. Geological Survey to coordinate this study with the needs of the prospective users, including industries and government agencies. Objectives of the Study Objectives The principal objectives of the study are to: 1) Describe the existing water resources and hydrologic relations necessary to determine water supply and predict effects of proposed water development; and 2) design data-collection programs for the evaluation of the effects of water development. Specific Objectives Surface water. 1) Describe distribution and quality of strearrflow areally and with time. Special emphasis would be directed toward ephemeral and intermittent streams. 2) Determine the relation of hydrology to other aspects of the environment, including erosion and sedimentation, the biologic community, and land use. 3) Define hydrologic relations necessary for estimating quantity and quality of surface water at sites not routinely gaged or sampled. 4) Develop methods to predict effects of proposed water development. Ground water. The present extent and distribution of ground-water withdrawals would be described. The extent and characteristics of the aquifers would be determined in order to predict potential water supplies available for new energy developments. Energy-development sites would be monitored to detect potential effects on ground water including: 1. Changes in permeability of confining beds due to mining. 2. Effects of heat from in-situ processing of oil shale on the hydrologic properties of aquifers and on water quality. 3. Changes in water quality resulting from shattering or pulverizing saline rocks in contact with ground waters; also, changes in the solvent action of ground water due to changes in temperature or changes in the content of dissolved gases. Units of Measurement The analyses and compilations in this report were made with English units of measurement. The equivalent metric units are given in the text and illustrations, where appropriate. English units only are showi in tables where, because of space limitations, the dual system of English and metric units would not be practicable. For those readers who may prefer to use metric units rather than English units, conversion factors for terms used in this report are as follows: Multiply English units To obtain metric units inches (in) feet (ft) miles (mi) acres square miles (mi2 ) gallons (gal) gallons per ton (gal/ton) cubic feet (ft 3 ) acre-feet (acre-ft) barrels (bbls) Length 25.4 .0254 .3048 1.609 Area 4047 .4047 .4047 .004047 2.590 Volume 3.785 3.785 3.785X10" 4.172 28.32 .02832 1233 1.233X10" 1.233X10" 158.8 millimetres (mm) metres (m) metres (m) kilometres (km) square metres (m2 ) hectares (ha) square hectometre (hm2 ) square kilometres (km2) square kilometres (km2 ) litres (1) cubic decimetres (cH 3 ) cubic metres (m 3 ) litres per tonne (1/t) cubic decimetres (d-i 3 ) cubic metres (m 3 ) cubic metres (m 3 ) cubic hectometres (hm 3 ) cubic kilometres (k**i 3 ) litres (1) cubic feet per second (ft 3/s) gallons per minute (gal/min) .02832 .06309 .06309 6.309X10"5 million gallons per day (Mgal/d) 43.81 pound (Ib) ton (short) British thermal units per pound (BTU/lb) .04381 Mass 453.6 .9072 Heat value .5556 litres per second (1/s) cubic decimetres per second (dm 3/s) cubic metres per second (m 3/s) litres per second (1/s) cubic decimetres per second (dm 3/s) cubic metres per second (dm 3/s) cubic decimetres per second (dm 3/s) cubic metres per second (m3/s) grams (gm) tonne (t) calorie, gram per gram (cal, gm/gm) Well and Surface-Water Station Numbering System The location sites of wells, springs, and oiland gas-test holes, referred to in this report, are designated by a numbering system based on the Federal system of land subdivision. The first number denotes the township, the second number denotes the range, and the third number denotes the section. One or more letters follow the section number and denote the location within the section. The section is divided into four quarters of 160 acres (64.8 hm2 ) and lettered a, b, c, and d in a counterclockwise direction, beginning in the northeast quarter. Similarly, each quarter may be further divided into quarters of 40 acres (16.2 hm2 ) and again into 10-acre (4.05 hm2 ) tracts and lettered as before. The first letter following the section number denotes the quarter section; the second letter, if shown, denotes the quarter-quarter section; and the third letter denotes the quarter-quarter-quarter section, or 10-acre (4.05 hm2 ) tract. For example, in the following illustration, the location-site number 15-lll-32cd is in the SE% of the SW% of sec. 32, T. 15 N., R. Ill W.:

A plan for study of water and its relation to economic development in the Green River and Great Divide basins in Wyoming