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Often these uses of water compete with one another. For instance, pumping of ground water for agriculture can lower water levels in natural springs, thereby threatening the existence of aquatic animals and plants. Or pumping of ground water in rural areas for municipal water supply can limit the amount of water available for agriculture. Tools are needed to analyze the effects of these competing interests in water and to allow land managers and planners to balance the various uses. A ground-water computer model is one such tool that can be used to examine effects from pumping on water levels, spring flows, and flow paths (directions of ground-water flow). These effects can affect water availability, water-dependent ecosystems, and the movement of contaminants. A computer model can be a valuable tool for managing the water resources and for addressing complex socio-economic and political issues resulting from conflicting water uses.

Ground-Water Flow Modeling by the U.S. Geological Survey in Nevada: Uses and Approaches