Both wells and springs serve as sources of ground-water supply. However, most springs having yields large enough to meet municipal, industrial, and large commercial and agricultural needs occur only in areas underlain by cavernous limestones and lava flows.
Therefore, most ground-water needs are met by withdrawals from wells. The response of aquifers to withdrawals from wells is an important topic in ground-water hydrology. When . withdrawals start, the water level in the well begins to decline as water is removed from storage in the well . The head in the well falls below the level in the surrounding aquifer. As a
result, water begins to move from the aquifer into the well.
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