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Figure 40. Hydrograph from monitoring well in Long Island, illustrating steady state conditions from about 1940 to about 1960, and a new steady state after the system equilibrated to construction of a sewer system and concomitant reduction in recharge by about 1975.  The perturbation (change in infiltration and recharge) led to non-steady conditions from around 1960-1973, manifested in a clear decrease in water level.
Originally uploaded in Integrate:Teaching for Sustainability:InTeGrate Modules:Water Science and Society:Student Materials.

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Uploaded: Mar28 17


Last Modified: 2017-03-28 09:19:28
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Source: U.S. Geological Survey circular 1186
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