- Drought (USGS Open-File Report 93-642)
- On-line report describes drought, its causes and effects.
Download the report in PDF format (file size 80k; requires Adobe Acrobat).
- What Is Ground Water?(USGS Open-File Report 93-643)
- On-line USGS report explains basic concepts about ground water
- USGS Water-Resources Publications and Products
- How to find on-line and printed USGS reports, fact sheets, posters, software, educational materials
- Hydrology Primer
- On-line guide explains basic hydrology, surface water, ground water concepts
- The Hydrologic Cycle
- Illustration shows the water cycle, from ocean, to the air, to land, and back to the sea
- Rain: A Water Resource
- On-line guide to rain, rainfall measurements and equivalents
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