Digital-model simulation of the Toppenish alluvial aquifer, Yakima Indian Reservation, Washington

Open-File Report 81-425
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Abstract

Increasing demands for irrigating additional lands and proposals to divert water from the Yakima River by water users downstream from the Yakima Indian Reservation have made an accounting of water availability important for present-day water management in the Toppenish Creek basin. A digital model was constructed and calibrated for the Toppenish alluvial aquifer to help fulfill this need. The average difference between observed and model-calculated aquifer heads was about 4 feet. Results of model analysis show that the net gain from the Yakima River to the aquifer is 90 cubic feet per second, and the net loss from the aquifer to Toppenish Creek is 137 cubic feet per second. Water-level declines of about 5 feet were calculated for an area near Toppenish in response to a hypothetical tenfold increase in 1974 pumping rates.

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Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Digital-model simulation of the Toppenish alluvial aquifer, Yakima Indian Reservation, Washington
Series title Open-File Report
Series number 81-425
DOI 10.3133/ofr81425
Year Published 1981
Language English
Publisher U.S. Geological Survey
Description v, 34 p.
Country United States
State Washington
Other Geospatial Yakima Indian Reservation
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