United States Geological Survey YearbookU.S. Geological Survey, 1994 - Geology |
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Page 32
... irrigated agricul- ture ( about 1940 ) to 1980. These declines and continued irrigation development in the region led in 1988 to a U.S. Geological Sur- vey ( USGS ) program to monitor annual water - level changes in the High Plains aqui ...
... irrigated agricul- ture ( about 1940 ) to 1980. These declines and continued irrigation development in the region led in 1988 to a U.S. Geological Sur- vey ( USGS ) program to monitor annual water - level changes in the High Plains aqui ...
Page 33
... irrigation wells that are well suited for monitoring water - level change because their large diameters and large pumping capacities make them less prone to plugging . Water - level measurements in the High Plains usually are made ...
... irrigation wells that are well suited for monitoring water - level change because their large diameters and large pumping capacities make them less prone to plugging . Water - level measurements in the High Plains usually are made ...
Page 35
... irrigated acreage was in the Northern High Plains , where greater potential recharge and smaller consumptive irrigation require- ments resulted in smaller net withdrawals from the aquifer than in the Central and Southern High Plains ...
... irrigated acreage was in the Northern High Plains , where greater potential recharge and smaller consumptive irrigation require- ments resulted in smaller net withdrawals from the aquifer than in the Central and Southern High Plains ...
Page 39
... irrigated agricul- ture . Harbor and channel dredging has changed the dredged areas and disposal sites and altered water - flow patterns and salinity . Contaminants enter the estuary in municipal and industrial sewage and urban and ...
... irrigated agricul- ture . Harbor and channel dredging has changed the dredged areas and disposal sites and altered water - flow patterns and salinity . Contaminants enter the estuary in municipal and industrial sewage and urban and ...
Page 45
... irrigated agriculture , which has changed the chemistry and hydrology of the alluvial aquifer in at least two important ways . First , the infiltration of irrigation water has resulted in a buildup of dissolved nitrate in ground water ...
... irrigated agriculture , which has changed the chemistry and hydrology of the alluvial aquifer in at least two important ways . First , the infiltration of irrigation water has resulted in a buildup of dissolved nitrate in ground water ...
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activities Administration agencies agricultural aquifer areas Assessment atmosphere Award Bureau Center City City of w coal Colorado comet Commission concentrations contaminant cooperation in earth County Water data sets database debris flows discharge distribution Division DSDL earth science environment Environmental Federal flood floodplain geographic information systems Geological Survey USGS GeoMedia geospatial data global ground-water hazards High Plains hydrologic impact Internet Irrigation KILOMETERS Lake land levees locations maps ment methane Mineral Resources Mississippi River monitoring Mount Rainier Mount Zirkel Wilderness Municipal National natural gas nitrate Northridge earthquake NSDI pesticides petroleum Planning region Reston River Basin Scientific and technical scientists sediment seismic Service South Platte River spatial data studies technical cooperation Telephone tion Transportation U.S. Geological Survey U.S.-Mexico border University users USGS Valley videoconferencing Volunteer Water Conservation District Water District Water Resources