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' The Central Valley is very dependent upon the precipitation in the Sierra Nevada and in parts <br /> • of the Klamath Mountains for surface water supply and ground water recharge (Williamson, et <br />' al, 1989) <br /> Agriculture is the mayor commercial activity in the Central Valley with 30% of the population <br /> employed by agricultural industry (Bertoldi, et al, 1991) In an area with little annual <br /> precipitation and such a large agricultural base, ground water becomes the primary source for <br /> irrigation Most of the water used for irrigation in the Central Valley is supplied by ground <br /> water wells, however during wet years this amount decreases while more water for irrigation <br /> is supplied by surface water (Bertoldi, et al, 1991) <br /> 1 <br /> iF 169351861CL.OSLfRE RPI' 5 Environmental Science&Engmeermg Inc <br />