REGIONAL EVALUATION OF GROUNDWATER AGE DISTRIBUTIONS USING LUMPED PARAMETER MODELS WITH LARGE, SPARSE DATASETS: EXAMPLE FROM THE CENTRAL VALLEY, CALIFORNIA, USA

Bryant C. Jurgens1, John Karl Bohlke2, Stefan Voss1, Miranda S Fram1 and Brad Esser3, (1)USGS California Water Science Center Sacramento, Sacramento, CA, United States, (2)USGS, 431 National Center, Reston, VA, United States, (3)Lawrence Livermore National Laboratory, Livermore, CA, United States