Digital model of the Hollister Valley ground-water basin, San Benito County, California

Water-Resources Investigations Report 79-32



A two-dimensional finite-difference digital model was constructed to simulate effects of proposed pumping and recharge schemes on water levels in the Hollister Valley ground-water basin. Pumping rates in the valley are expected to increase from 24,000 acre-feet per year in 1968 to an ultimate rate of 38,500 acre-feet per year. The model was calibrated for the period 1940-51 and tested by simulating water-level changes from 1951 to 1968. Model-generated water levels were generally within 15 feet of observed water levels for the calibration period. For the testing period, computed and observed water levels differed by as much as 35 feet in parts of the study area. Discrepancies in the test results may be caused by errors in historical pumpage data or by unidentified faults or local semiconfined conditions. Under one proposed development scheme, model-predicted water levels to the year 2020 declined up to 170 feet in previously undeveloped areas. For developed areas near the city of Hollister, water-level declines of 100 to 125 feet were predicted for the same period. (Woodard-USGS)

Study Area

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Digital model of the Hollister Valley ground-water basin, San Benito County, California
Series title Water-Resources Investigations Report
Series number 79-32
DOI 10.3133/wri7932
Year Published 1979
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Description Report: iv, 17 p.; 6 Plates: 45.65 x 22.17 inches or smaller
Country United States
State California
County San Benito County
Other Geospatial Hollister Valley
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