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7 Titles Match Your Query
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1. GIS Coverage for the National Water-Quality Assessment (NAWQA) Program Retrospective Database for Nutrients in Surface Water: Monitoring Locations [NAWQAHIS]
The retrospective database is a compilation of historical water-quality and ancillary data collected before NAWQA Study Units initiated sampling in 1993. This coverage contains the point locations ...


2. GIS Coverage of the National Water-Quality Assessment (NAWQA) Program Trace Elements Sampling Sites for the EPA Clean Air Mapping and Analysis Program (C-MAP) [NAWQA_TE]
This is a point coverage of the sampling sites for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program Study-Unit investigations of Trace Elements for the conterminous United ...


3. GIS Coverage of the National Water-Quality Assessment Study-Unit Investigations in the conterminous United States (NAWQA) [NAWQA]
This is a coverage of the boundaries and codes used for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program Study-Unit investigations for the conterminous United States, excluding ...


4. Risk of nitrate contamination in ground waters of the United States-- A national perspective [USGS_gwrisk]
This map was designed to present patterns of risk for nitrate contamination at large regional or national scales. Knowing where and what type of risks to ground water exist can alert water-resources ...


5. Selected Characteristics of Large Reservoirs, USGS [Sel_Char_of_lg_Reservoirs]
This is a point coverage of dams in the United States and Puerto Rico, which originally was derived from the national inventory of dams database (U.S. Army Corps of Engineers, 1982). The ...


6. GIS Coverage of the National Water Quality Assessment Program: Surface Water Nutrient Sampling Sites for the EPA Clean Air Mapping and Analysis Program (C-MAP) [NAWQA_NU]
This is a point coverage of the sampling sites for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program Study-Unit investigations of Surface Water Nutrients for the conterminous ...


7. County-based estimates of nitrogen and phosphorus content of animal manure in the United States for 1982, 1987, and 1992. [USGS_manure]
These estimates are intended for large-scale ground- and surface-water analyses of nutrient sources or changes in these sources. These data on nutrients in manure can be compared to fertilizer inputs ...


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