| Abstract: | Surface and ground water is used to irrigate crops and maintain lakes on wildlife refuges in the 2,200-square-mile Mud Lake study area of eastern Idaho. Ground-water withdrawals increased from about 240,000 acre-feet in 1983 to about 370,000 acre-feet in 1990. Of the 660,000 acre-feet total estimated recharge from precipitation and irrigation in the study area in 1980, half was in an area where, according to an independent study, recharge was predicted to decline by 95,000 acre-feet. Water managers need the ability to evaluate effects of water-use changes on the future supply of surface and ground water. A five-layer, three-dimensional, finite-difference, numerical ground-water flow model was calibrated by trial and error to assumed 1980 steady-state hydrologic conditions to obtain a better understanding of the geohydrology and provide a tool to evaluate water-use alternatives. Water-level gradients simulated by the model were similar to gradients measured in 1980. Simulated underflow across model boundaries for 1980 was 932,000 acre-feet. Simulated losses from and gains to most streams and lakes were within 2 percent of values calculated using streamflow measurements and estimates. Simulated discharge from flowing wells matched measurements for 1980. An attempt to calibrate the numerical model to transient hydrologic conditions in monthly increments from 1981 to 1990 was discontinued because of data limitations. |
| Genre: | USGS Numbered Series |
| ProdID: | 29884 |
| Citation Author: | Spinazola, J. M. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | v, 78 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey ;
U.S.G.S. Earth Science Information Center, Open-File Reports Section [distributor], |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 93-4227 |
| Citation Search Results Text: | Geohydrology and simulation of flow and water levels in the aquifer system in the Mud Lake area of the eastern Snake River plain, eastern Idaho; 1993; WRI; 93-4227; Spinazola, J. M. |
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| Citation Year: | 1993 |
| Type: | citation/reference |
| Text: | Geohydrology and simulation of flow and water levels in the aquifer system in the Mud Lake area of the eastern Snake River plain, eastern Idaho; 1993; WRI; 93-4227; Spinazola, J. M. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1993/4227/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1993/4227/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey ;
U.S.G.S. Earth Science Information Center, Open-File Reports Section [distributor], |
