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Unformatted text preview: Withdrawal>recharge o Ogalla Aquifer 60-425 m thick Fossil water At present rate of withdrawal, by 2020, 25% of resource will be gone o Beneath coastal land, fresh water floats on salt water o Pumping causes the fresh/salt boundary to rise o Eventually, salt water may enter the pumping well o Salt water intrusion renders the water unpotable o Severe water table decline can alter surface water flow By capturing flow, wells may dewater streams and lakes Especially problematic in arid and semi-arid regions o Cones of depression are capable of reversing flow o An expanding cone may capture pollutants o There are many sources of groundwater contamination o Pollution is often not recognized until damaged occurs o Groundwater cleanup is slow, expensive and limited o Point source leaking gas tank...
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- Spring '08