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Water-level trends and pumpage in the deep bedrock aquifers in the Chicago region, 1991 - 1995 (1997) [C-182]
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- Water-level trends and pumpage in the deep bedrock aquifers in the Chicago region, 1991 - 1995 (20060928185505_ISWSC-182.pdf)
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The OCLC Open WorldCat number for the electronic document record is '124514585'.
Description
The deep bedrock aquifer system in northeastern Illinois is encountered at depths ranging from about 200 feet in areas of central northern Illinois to an average of about 1,000 feet below land surface at Chicago. The aquifers have a collective thickness of 300 to 1,300 feet in the Chicago region, averaging 700 feet. They are composed chiefly of sandstones and dolomites, although most of the water is derived from the sandstone units. Pumpage from deep bedrock wells for public and self-supplied industrial supplies in the Chicago region increased from 200,000 gallons per day (gpd) in 1864 to a peak withdrawal of 182.9 million gallons per day (mgd) in 1979. Between 1991 and 1994, pumpage decreased from 112.7 mgd to 67.1 mgd, mostly due to a shift to Lake Michigan water, particularly in DuPage County. As a result, water levels in deep wells rose between 1991 and 1995, particularly in southern Lake, eastern DuPage, and western Cook Counties. Average annual water-level rises during the four-year period varied from one foot in Kendall County to 38 feet in DuPage County and averaged about 14 feet. This marked the first time that average water-level changes were upward in all eight counties of the Chicago area since detailed record-keeping began in the 1950s.
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.Circular Water-Level Trends and Pumpage in the Deep Bedrock Aquifersin the Chicago Region, 1991-1995 by Adrian P. VisockyOffice of Ground Water Resources Evaluation & Management Illinois State Water Survey Division of the Illinois Department of Natural Resources 1997 CIRCULAR Water-Level Trends and Pumpagein the Deep Bedrock Aquifers in the Chicago Region, 1991-1995 Adrian P. Visocky Title: Water-Level Trends and Pumpage in the Deep Bedrock Aquifers in the Chicago Region, 1991-1995.Abstract: The deep bedrock aquifer system in northeastern Illinois is encountered at depths ranging from about feet in areas of central northern Illinois to an average of about 1,000 feet below land surface at Chicago. The aquifers have collective thickness of to 1,300 feet in the Chicago region, averaging feet. They are composed chiefly of sandstones and dolomites, although most of the water is derived from the sandstone units. Pumpage from deep bedrock wells for public and self-supplied industrial suppli
Issuing Agency
Illinois State Water Survey
Contact
Name: Pat Morse
Organization: Illinois State Water Survey
2204 Griffith Dr.
Champaign, IL 61820
Phone: 217 244-5459
Fax: 217 333-4983
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- Language(s): EN-English
- Creation Date (from issuing agency): 9 24 2004
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- Web Address On Date Of Deposition: http://www.sws.uiuc.edu/pubdoc/C/ISWSC-182.pdf
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