Operation of hydrologic data-collection stations by the U.S. Geological Survey in 1997

Lew, Melvin

doi:10.3133/ofr97832

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Principal-components Analysis1

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2001

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“…Approximately 11,000 (less than one-third) of the reported number of long-term observation wells are presently monitored through the USGS Cooperative Water Program. This number is significantly less than the 18,300 long-term observation wells reported in a 1997 inventory of hydrologic monitoring stations operated under the Cooperative Water Program (Lew, 1998). The difference between the two numbers, in part, reflects a difference in the definition of "long-term" observation wells.…”

Section: Principal-components Analysismentioning

confidence: 81%

Ground-water-level monitoring and the importance of long-term water-level data

Taylor¹,

Alley²

2001

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177

145

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round water is among the Nation's most precious natural resources. Measurements of water levels in wells provide the most fundamental indicator of the status of this resource and are critical to meaningful evaluations of the quantity and quality of ground water and its interaction with surface water. Water-level measurements are made by many Federal, State, and local agencies. It is the intent of this report to highlight the importance of measurements of groundwater levels and to foster a more comprehensive and systematic approach to the long-term collection of these essential data. Through such mutual efforts, the Nation will be better positioned in coming decades to make wise use of its extensive groundwater resources.

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Section: Principal-components Analysismentioning

confidence: 81%