Geohydrology and Numerical Model Analysis of Ground-Water Flow in the Pullman-Moscow Area, Washington and Idaho

摘要

The purpose of the report is to document the results of a study to: (1) define the geohydrology of the area around Pullman, Wash., and Moscow, Idaho; and (2) construct and calibrate a three-dimensional ground-water-flow model for the area to calculate the effect of changes in the rate of withdrawal on the ground-water system. The study updates the work done in the 1970's by the U.S. Geological Survey (Barker, 1979). Specific objectives of the study included--defining data needs and collecting data to update the current understanding of the ground-water-flow system of the area, defining the thickness of the basalt in the study area using a magnetotelluric geophysical technique, constructing and calibrating a three-dimensional numerical model of the flow system, operating the model under various management plans, and evaluating their impacts on the geohydrologic features of the area, and comparing the results of the model presented in the report with results of a two-dimensional finite-difference ground-water-flow model by Barker (1979).