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the other two locations discussed in the paper), that value is applied to local <br />rainfall in the project area. The San Joaquin County Environmental Health <br />Department consistently approved this method from January 2017 through <br />January 2019. <br />As discussed in the 100 percent rainfall section (above), the average of the two <br />closest WRCC rain stations yields an annual rainfall value of 17.75 inches (Table <br />3). Assuming 75 percent of this precipitation percolates to the aquifer (as <br />Hantzsche and Finnemore did in Chico), the rate of recharge from percolating <br />waters is calculated to be an average of 13.3 inches per year. <br />Regional Recharge from Percolating Waters: In 2018, the Eastern San <br />Joaquin Groundwater Authority (ESJGA) commissioned a comprehensive <br />ground-water model covering parts of San Joaquin County, northern Stanislaus <br />County, and southern Sacramento County. In the model, percolating recharge <br />waters throughout the Eastern San Joaquin subbasin (portion of the model area) <br />were evaluated; a value of 650,000 acre-feet was used for ground-water <br />recharge throughout the subbasin. This value was derived after numerous model <br />calibration runs. By dividing 650,000 acre-feet by the total acreage of the <br />subbasin (772,377 acres), and converting to inches, a regional rate of recharge <br />from percolating waters throughout the subbasin was found to be 10.1 inches per <br />year. This value should be viewed as an average for the subbasin area. <br />LOGE 1906 Page 11