Every day 83.3 billion gallons of ground water are pumped in the United States. That is about 2.49 trillion gallons per month, or 29.88 trillion gallons per year. http://www.ngwa.org
The Office of Arid Lands Studies (OALS) is a multidisciplinary teaching, research, and information unit in the College of Agriculture and Life Sciences at the University of Arizona in Tucson.
Drought monitoring and early warning Near real time quantification of drought and crop growth conditions and the estimation of irrigation needs, based on images from METEOSAT geostationary satellite.
GHCC Global Hydrology and Climate Center The primary focus of the research center is to understand the Earth's global water cycle, the distribution and variability of atmospheric water, and the impact of human activity as it relates to global and regional climate.
Drought WATCH The latest Palmer Drought Severity Index Map: The Drought Severity Index, developed by Palmer in 1965, is the most commonly used drought index in the United States.