Publication Citation

USGS Series Open-File Report
Report Number 80-1300
Title Digital model simulation of the hydrologic flow system, with emphasis on ground water in Spokane Valley, Washington and Idaho
Edition WRI/OFR
Language ENGLISH
Author(s) Bolke, E. L. Vaccaro; J. J. Washington
Year 1980
Originating office
USGS Library Call Number (200) R29o no.80-1300
Physical description 52 p. :ill., maps ;28 cm.
ISBN

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Abstract

A digital-computer model of the hydrologic flow system, with emphasis on ground water, was developed for the Spokane Valley, Washington and Idaho. The current rate of ground water pumping has little effect on water levels in the Spokane aquifer, although short-term water-level declines occur locally. The model was used to show the effects of increased ground-water pumping on aquifer heads and streamflow. Increasing the pumping rates, by a factor of 2 from the 1977 rates, lowered water levels in the Spokane aquifer less than 3 feet during a 1-year simulation. Doubling the ground-water pumping caused a decrease in discharge of the Spokane River, as measured at Spokane, of about 150 cubic feet per second during the summer months and about 50 cubic feet per second during the rest of the year. The leakage from the aquifer to the Little Spokane River was decreased by less than 10 cubic feet per second by doubling the ground-water pumping. (USGS)