| Abstract: | McHenry County, Illinois derives a major part of its ground-water supply from unconsolidated sand and gravel aquifers. Twenty-six public systems tap these aquifers for all or part of their supply. The county contains two types of sand and gravel aquifers--unconfined aquifers which are at or near the land surface, and semiconfined aquifers which are overlain by one or more till members. A map of water levels in unconfined and semiconfined aquifers shows that moraines and other topographically high features are ground-water divides of local flow systems. Distances from ground-water divides to discharge areas are a few miles or less. The quality of the ground water is good for most uses, although treatment may be required to reduce hardness (median concentration is 340 milligrams per liter) and dissolved iron (median concentrations is 140 micrograms per liter). Ground water is a calcium magnesium bicarbonate type. The range of specific conductance is from 260 to 1,170 micromhos. Values are higher near towns. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 28876 |
| Citation Author: | Nicholas, J. R.; Krohelski, J. T. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | vii, 34 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 83-4048 |
| Citation Search Results Text: | Water in sand and gravel deposits in McHenry County, Illinois; 1984; WRI; 83-4048; Nicholas, J. R.; Krohelski, J. T. |
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| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | Water in sand and gravel deposits in McHenry County, Illinois; 1984; WRI; 83-4048; Nicholas, J. R.; Krohelski, J. T. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1983/4048/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1983/4048/report.pdf |
| URL (PLATE): | http://pubs.usgs.gov/wri/1983/4048/plate-1.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
