| Abstract: | A digital-computer model was developed to simulate three-dimensional ground-water flow in aquifers underlying the Sequim-Dungeness peninsula, Clallam County, Washington. Analysis using the model shows that leakage from irrigation ditches is the area ‘s most important source of ground-water recharge. Termination of the irrigation system would lead to lower heads throughout the ground-water system. After 10-20 years of no irrigation, the water-table aquifer would have average drawdowns of about 20 feet and some areas would become completely unsaturated. Several hundred wells could be in danger of going dry. If irrigation were terminated, leakage from the Dungeness River would become the major source of ground-water recharge. As of June 1980, ground-water quality has apparently not been affected in the study area by the use of on-site domestic sewage-disposal systems. The median nitrate-plus-nitrite (as N) concentration in the water-table aquifer was 0.25 milligrams per liter, and the maximum concentration was 2.5 milligrams per liter. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 26859 |
| Citation Author: | Drost, B. W. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | viii, 69 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: | 83-4094 |
| Citation Search Results Text: | Impact of changes in land use on the ground-water system in the Sequim-Dungeness Peninsula, Clallam County, Washington; 1983; WRI; 83-4094; Drost, B. W. |
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| Citation Year: | 1983 |
| Type: | citation/reference |
| Text: | Impact of changes in land use on the ground-water system in the Sequim-Dungeness Peninsula, Clallam County, Washington; 1983; WRI; 83-4094; Drost, B. W. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1983/4094/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1983/4094/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
