Trends in ground-water levels in Wisconsin through 1981

Hydrographs of ground-water levels in Wisconsin display fluctuations in the potentiometric surface of confined and unconfined aquifers. The graphs are plotted from periodic (weekly or monthly) measurements and from continuous recording gage records. Two hundred and ten hydrographs having periods of record of at least 5 years between 1934 and 1981 are included.

The water-level changes shown represent both natural fluctuations reflecting climatic control and declines or recovery brought about by pumping or cessation of pumping of ground water.