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Ground Water Level Monitoring - Part 4

September 1, 2002
Find out where we've been and where we're headed on this important issue.

The severe drought of the 1930s in much of the United States created widespread concern that declining water levels in wells and diminished flow of springs may be warnings of the eventual exhaustion of the nation's ground water supplies. During the drought years of the 1930s, considerable interest arose in the establishment of systematic programs for monitoring water levels in observation wells. It is instructive to compare the status of water level monitoring during the 1930s, during the 1950s (a second severe drought period) and today at the beginning of the 21st century.

Water level monitoring in southwest Florida. Courtesy of Biological Research Associates

The 1930s

In 1933, about 3,000 observation wells were being measured periodically by the United States Geological Survey (USGS) and by state agencies, and about 115 of these wells were equipped with automatic (continuous) water level recorders. Records of water levels covering many years were available for only a few areas, notably Southern California, Honolulu, the Roswell Basin in New Mexico and Long Island, N.Y. Other areas of heavy withdrawals had more sporadic water level records.

In 1936, the USGS released the first annual report on the fluctuations of ground water levels and artesian pressures in the United States. This report was envisioned "as a step in the realization of a nationwide program of water level records." At the time, it was noted that the availability of water level records was dependent upon ongoing investigations and that some of the most valuable records were in danger of being discontinued because of lack of funds for the projects that supported the monitoring. The need also was expressed for more observation wells outside of areas of major ground water withdrawals to provide information on the effects of climatic variations on water levels. In addition, increased automatic monitoring of water levels was recommended.

The 1950s

Ground water levels at the end of 1954 were at or near record lows throughout most of the southern two-thirds of the United States, creating renewed concern about the possible exhaustion of the nation's ground water supplies. Federal, state and local agencies measured water levels in about 20,000 long-term observation wells across the country with records for many of the observation wells dating back to the 1930s. V.C. Fishel used water-level records from nine states to illustrate how in most areas, the low water levels were largely a function of the dry climate conditions and would recover after the drought ended. In his publication Long-term Trends of Ground Water Levels in the United States, Fishel also noted that significant water-level declines in some areas, including "some of the best and most important aquifers," were caused by large ground water withdrawals, and that water-level declines in these areas would likely persist or worsen after the drought ended.

Today

In 2001, there were on the order of 42,000 long-term observation wells in the United States with five or more years of water level record. These wells are distributed throughout all states, and the level of effort varies greatly among states. No nationwide, systematic water level monitoring program exists. Observation wells are still largely selected from existing wells that are part of specific studies, and the continuity of records is difficult when studies draw to a close. The ease of making data available on the Internet enhances the value of automatic water level monitoring beyond that of the previous decades, but automatic measurement of water levels in long-term observation wells remains limited (for example, less than 10% of USGS long-term monitoring wells have continuous monitoring). Relatively little long-term monitoring takes place outside of major withdrawal areas. Concerns about the exhaustion of ground water supplies exist for parts of the United States, but no longer for the nation as a whole. Concerns about the effects of pumping on surface water bodies, about water quality, and about the effects of possible climate change on ground water and surface water resources are much greater than in the 1930s and 1950s.

Links

  • U.S. Geological Survey

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