Thematic GIS Data Sets for Water Resources

National Coverages

• Benchmark Stations
• Climate Divisions
• Ecoregions
• Herbicide use estimates for the top 20, 21st to 40th, 41st to 60th, 61st to 80th, and 81st to 96th most used herbicides
• Hydro-Climatic Data Network (HCDN): A USGS streamflow data set for the United States for the study of climate fluctuations, 1874-1988
• Hydrologic Cataloging Units: 1:2,000,000 or 1:250,000
• Land Use
• National Stream Quality Accounting Network (NASQAN) Sites
• Nitrogen-fertilizer sales for 1985, 1986, 1987, 1988, 1989, 1990, and 1991
• Reservoirs
• Runoff, 1951-80
• Streamflow Basin Characteristics
• Streams
• 1987 Census of Agriculture Data on: Chemical Use, Cropping Practices Part 1, Cropping Practices Part 2, Expenses, Land, and Livestock

National Water Quality Assessment (NAWQA) Program Coverages

• NAWQA Study Area Locations Cycle 1 (1991-2001)
• NAWQA Study Area Locations Cycle 2 (2001-2012)

Selected Regional and Local Data Sets

• Mean Annual Precipiation for Oklahoma, 1961-1990
• Generalized skew coefficients for maximum streamflow in Oklahoma