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9.23 cubic feet acre-feet acre-ft/yr alluvium and older altitude of ground-water altitude of water aquifer parameters area in cfs Bird Creek Hills Boundary between alluvium Contour interval 20 contours drawn Datum is mean evapotranspiration feet per second Flint Hills friable ground water ground-water flow regime ground-water movement historical water-level data hydrologic boundaries infiltration of rain interval 20 feet irrigation Juan Valley ground-water l20-foot contour Lomerias Muertas losing stream mathematical model mean sea level middle member Model calibration model-generated water Model-generated water-level contour nodal area nodes Number indicates Number is altitude older rocks Pajaro River periphery of San predevelopment recharge pumpage Purisima Formation quantities recharge and discharge recharge mechanism San Benito County San Benito River San Juan Valley saturated thickness selected observation Shows altitude simulated water levels specific yield streamflows transient period transient-state conditions transmissivity and specific U.S. Geological Survey upper member Valley ground-water basin values of transmissivity water table