Publication Citation

USGS Series Water-Resources Investigations Report
Report Number 96-4111
Title Ground-water pumpage in the Willamette lowland regional aquifer system, Oregon and Washington, 1990
Edition -
Language ENGLISH
Author(s) Collins, Charles A.; Broad, Tyson M.
Year 1996
Originating office
USGS Library Call Number (200) WRi no.96-4111
Physical description iii, 27 p. :ill., maps (some col.) ;28 cm.
ISBN

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Abstract

Ground-water pumpage for 1990 was estimated for an area of about 5,700 square miles in northwestern Oregon and southwestern Washington as part of the Puget-Willamette Lowland Regional Aquifer System Analysis study. The estimated total ground-water pumpage in 1990 was about 340,000 acre-feet. Ground water in the study area is pumped mainly from Quaternary sediment; lesser amounts are withdrawn from Tertiary volcanic materials. Large parts of the area are used for agriculture, and about two and one-half times as much ground water was pumped for irrigation as for either public- supply or industrial needs. Estimates of ground- water pumpage for irrigation in the central part of the Willamette Valley were generated by using image-processing techniques and Landsat Thematic Mapper data. Field data and published reports were used to estimate pumpage for irrigation in other parts of the study area. Information on public- supply and industrial pumpage was collected from Federal, State, and private organizations and individuals.