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The effects of withdrawals fron the principal ground-water reservoir in northern Utah Valley, Utah, were projected ty means of a three-dimensional, finite-difference, digital-computer model, which was constructed to aid understanding of the ground-water system and to simulate ground-water flow. The model was compared with water levels measured in 1947, and observed waterlevel changes from 1947-83. The model was used to evaluate ground-water data presented in previous reports, to simulate varying quantities of ground-water withdrawal and recharge, and to estimate water-level changes for 1980-2000. The average annual rate of recharge for the area is assumed to be 190,000 acre-feet per year, and the average annual discharge f ran wells at the end of transient-state calibration was assumed to be 50,100 acre-feet per year. Water-level declines of as much as 25 feet are projected for the 20-year period if the average recharge rate is assumed and discharge from wells is as much as 91,400 acre-feet per year. During transient-state calibration, changes in recharge to the principal ground-water reservoir were shown to be a major cause of the variations in water levels.

The ground-water system and simulated effects of ground-water withdrawals in northern Utah Valley, Utah