United States Geological Survey YearbookU.S. Geological Survey, 1986 - Geology |
From inside the book
Results 1-5 of 45
Page 29
... irrigated farm land . The valley is also the site of several State and Federal waterfowl man- agement areas that are key stopping points for migratory waterfowl along the Pacific flyway . Several of these waterfowl manage- ment areas ...
... irrigated farm land . The valley is also the site of several State and Federal waterfowl man- agement areas that are key stopping points for migratory waterfowl along the Pacific flyway . Several of these waterfowl manage- ment areas ...
Page 30
... irrigation of soils as early as 1900 probably leached most of the readily soluble selenium during the first decade or more of irrigation . The result appears to have been the formation of a zone of ground water overlying what was the ...
... irrigation of soils as early as 1900 probably leached most of the readily soluble selenium during the first decade or more of irrigation . The result appears to have been the formation of a zone of ground water overlying what was the ...
Page 32
... irrigation water and the subsequent evaporation of ground water . Greatly in- creased ground - water recharge brought about by irrigation and the installation of subsurface drains have combined to bring selenium - rich water to the land ...
... irrigation water and the subsequent evaporation of ground water . Greatly in- creased ground - water recharge brought about by irrigation and the installation of subsurface drains have combined to bring selenium - rich water to the land ...
Page 69
... irrigated agriculture in California's Central Valley and by the export of water to arid areas south of the bay . The dams , reservoirs , and canals used to manage the water that flows toward San Francisco Bay comprise the world's ...
... irrigated agriculture in California's Central Valley and by the export of water to arid areas south of the bay . The dams , reservoirs , and canals used to manage the water that flows toward San Francisco Bay comprise the world's ...
Page 71
... irrigation water in the delta . Overfishing , elimination of essential habi- tats , changes in water quality , and , perhaps , some shifts in natural factors , such as ocean temperature , also may have contributed to changes in the ...
... irrigation water in the delta . Overfishing , elimination of essential habi- tats , changes in water quality , and , perhaps , some shifts in natural factors , such as ocean temperature , also may have contributed to changes in the ...
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activities Administration Alaska aquifer areas Assistant Award basin Bureau Calcasieu River California cartographic Chief Hydrologist City City of w climate coal coastal Commission concentrations contamination cooperative Coordination data base Denver Denver Federal Center Department of Public deposits Earth earth-science earthquake energy Environmental Federal agencies feet fiscal flow geographic information systems Geologic Division geologic map Geologist geophysical global change graphic ground water ground-water hazards hydrologic investigations Irrigation Lake Lake Nyos land levels located Management Menlo Park ment miles mineral resources National Center National Mapping Division natural Office organic percent Planning processes radon Regional resource assessment Reston River rocks samples SAN DIEGO San Joaquin River scientific scientists sediment seismic selenium Service soil Stop streamflow studies surface tion Transportation U.S. Geological Survey United University users USGS Valley Volcano Water Conservation District Water District water quality water-quality wetlands zone