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Publication Abstract

Hydrogeologic Evaluation of Sand and Gravel Aquifers for Municipal Groundwater Supplies in East-central Illinois Kempton, John P., Walter J. Morse, and Adrian P. Visocky, 1982  Illinois State Water Survey, Champaign, IL,  ISWS COOP-8    Full Text Available

Glacial sand and gravel aquifers have been identified stratigraphically and mapped in a 50- by 80-mile rectangular area of east-central Illinois. Located within the area are several water-short communities as well as the cities of Danville, Champaign, Urbana, Decatur, Shelbyville, Mattoon, Charleston, and Paris. An evaluation of all existing subsurface data, including data from 14 test holes and 7 test wells drilled for this study, indicates that only slightly more than half this region is underlain by aquifers with a potential for yielding municipal groundwater supplies.

The principal aquifer is the Mahomet Sand, a basal pre- Illinoian Banner Formation aquifer partially filling the buried Mahomet Bedrock Valley located generally west of Champaign. The Mahomet Sand is more than 100 feet thick in many locations and averages just under 10 miles wide over its approximately 30-mile length within east-central Illinois. Yields of individual wells from the aquifer are as high as 3500 gpm. Elsewhere in the region, small, thin aquifers occur within the Banner Formation.

The Glasford Formation (Illinoian) overlies the Banner and contains extensive sand and gravel aquifers, mainly at its base, throughout the western and northern parts of the region. Although Glasford aquifers are second in significance to the Mahomet Sand, primarily because they are thinner and cover less area, the largest of these may still yield up to 1000 gpm in local situations...



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