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Show ILLUSTRATIONS Facing Photographs (grouped according to chapters) page Chapter 7. The Need for Basic Information.....106 Chapters 8-10. Surface and Ground Water, Watershed Management, Flood Management........134 Chapter 11. Land Reclamation..........150 Chapters 12-13. Domestic and Industrial Water Sup- ply, Pollution Control.............190 Chapter 14. Inland and Intracoastal Waterways . . .214 Chapter 15. Hydroelectric Power.........230 Chapters 16-17. Recreation, Fish and Wildlife . . . 246 Chapter 18. Conservation Education........ 278 Facing Figures Page 1. Columbia River Basin-Water Resources and Land Use...................23 2. Columbia River Basin-Land and Water Projects . 25 3. Rio Grande Basin-Water Resources and Land Use...................27 4. Connecticut River Basin-Water Resources and Land Use.................30 Page 5. The Tennessee River System.........34 6. Comprehensive Development of the Tennessee Valley..................45 7. The Hydrologic Cycle...........98-99 8. Ground Water Areas in the United States . . . .115 9. Cropland Use................155 10. Population, and Cropland per Capita......155 11. Water Use, Rainfall, Runoff.........177 12. Population Change.............180 13. Average Annual Precipitation.........181 14. Principal Inland Waterways in the United States................206-207 15. Federal Hydro Power Projects.......222-223 16. Cost of Electricity to REA Cooperatives.....230 Figures Page 17. Rural Electrification.............232 18. Monthly Residential Electric Bills.......233 19. Initial Development of Potential Power in New England and New York............234 20. Electric Rate Experience in the Southeast . . 236-237 21. Electric Rate Experience in the Pacific North- west ................. 236-237 22. Public and Private Hydro Power Production . . . 239 23. Potential Water Power............241 24. Adequacy of Facilities for Gathering Precipitation Data...................337 25. Adequacy of Facilities for Gathering Evaporation Data...................338 26. Adequacy of Snow Course Coverage in the West . 339 27. Adequacy of Surface Water Stream Gaging Facili- ties ...................342 28. Adequacy of Ground Water Data.......344 29. Adequacy of Chemical Water Quality Informa- tion ...................346 30. Adequacy of Sediment Load Data......348 31. Adequacy of Reservoir Sedimentation Survey Data...................350 32. Status of Topographic Mapping in the United States..................356 33. Status of Geologic Mapping in the United States . 358 34. Areas Covered by the Soil Survey.......359 35. Extent of Soil Conservation Surveys......372 36. Outline of the Land Capability Classification . . 373 37. Example of a Land Capability Map......374 38. Areas Covered by Land Classification and Irriga- tion ....................377 39. Areas of Soil Erosion in the United States .... 378 40. Average Annual Precipitation of the United States . 380 41. Isohyetal Map-Total Storm..........381 42. Average Annual Runoff in Inches Depth in the United States...............382 TABLES Page Chapter 3.-Unity in Planning Elements of a water resources plan........47 Chapter 6.-A Resources Investment Program Federal resources budget, capital......... 91 Federal resources operation and maintenance pro- gram..................... 91 Federal expenditures for water resources development. 92 Estimates of future water resources expenditures ... 93 Chapter 9.-Watershed Management Amount and rate of infiltration...........128 Runoff, percolation and evapo-transpiration under different types of cover.............128 Land holdings of Federal agencies.........132 Condition of the Public Lands...........137 Chapter 11.-Land Reclamation Page Cropland and irrigated acreage in 17 Western States, 1944.....................152 Total individual income tax revenues from seven Federal reclamation projects...........152 Land in occupied farms in drainage enterprises, 1939 . 153 Total cropland in relation to population, 1910-50. . . 154 Source of calories in the United States diet, 1909-50. . 156 Difference between adequate diets at moderate and liberal costs.....~.............157 Cropland acreage used for various purposes, 1910-50 . 158 Projected acreage requirements for 1960 and 1975. . . 159 Land suitable for agricultural use which appears feasible for reclamation by flood protection, drainage, and clearing....................162 Agricultural production potentials.........165 7U1 |