| Abstract: | Mendocino County includes about 3,500 sq mi of coastal northern California. Groundwater is the main source for municipal and individual domestic water systems and contributes significantly to irrigation. Consolidated rocks of the Franciscan Complex are exposed over most of the county. The consolidated rocks are commonly dry and generally supply < 5 gal/min of water to wells. Unconsolidated fill in the inland valleys consists of gravel, sand, silt, and clay. Low permeability in the fill caused by fine grain size and poor sorting limits well yields to less than 50 gal/min in most areas; where the fill is better sorted, yields of 1,000 gal/min can be obtained. Storage capacity estimates for the three largest basins are Ukiah Valley, 90,000 acre-ft; Little lake Valley, 35,000 acre-ft; and Laytonville Valley, 14,000 acre-ft. Abundant rainfall (35 to 56 in/yr) generally recharges these basins to capacity. Seasonal water level fluctuations since the 1950 ‘s have been nearly constant, except during the 1976-77 drought. Chemical quality of water in basement rocks and valley fill is generally acceptable for most uses. Some areas along fault zones yield water with high boron concentrations ( <2 mg/L). Sodium chloride water with dissolved solids concentrations exceeding 1,000 mg/L is found in deeper parts of Little Lake Valley. (Author ‘s abstract) |
| Genre: | USGS Numbered Series |
| ProdID: | 27025 |
| Citation Author: | Farrar, C. D. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | vi, 81 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: | 85-4258 |
| Citation Search Results Text: | Ground-water resources in Mendocino County, California; 1986; WRI; 85-4258; Farrar, C. D. |
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| Citation Year: | 1986 |
| Type: | citation/reference |
| Text: | Ground-water resources in Mendocino County, California; 1986; WRI; 85-4258; Farrar, C. D. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1985/4258/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1985/4258/report.pdf |
| URL (PLATE): | http://pubs.usgs.gov/wri/1985/4258/plate-1.pdf |
| URL (PLATE): | http://pubs.usgs.gov/wri/1985/4258/plate-2.pdf |
| URL (PLATE): | http://pubs.usgs.gov/wri/1985/4258/plate-3.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
