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NR&E Winter 2010 39 Percolating below the surface of the earth are great subterrranea rivers that quench this nation’s thirst, irrigaat its crops, water its livestock, and fill its swimming pools. Groundwater is a vital natural resource that sustains our way of life. The U.S. Environmental Protection Agency (EPA) estimates that groundwater provides drinkiin water for 130 million Americans and 42 percent of our irrigation water. The U.S. Geological Survey estimates that 57 percent of the nation’s...