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SURFACE WATER INFORMATION <br /> Climatic Data: Rainfall versus Evapotranspiration <br /> NLS§3.2. Evapotranspiration(Eto)refers to water evaporation that takes place both at the soil <br /> surface and transpiration by plants. Although data exists illustrating significant Eto,this data <br /> applies to agricultural operations. The following Table illustrates rainfall and evapotranspiration <br /> for the Stockton area. Precipitation data was obtained from the Soil Survey of San Joaquin <br /> Co=. Evapotranspiration data was obtained from the California Irrigation Management <br /> Information System (CIMIS): <br /> TABLE 3 <br /> PRECIPITATION AND Eto DATA FOR STOCKTON, CA <br /> Month 2 Years in 10 will have more Eto Average Rainfall Exceeding Eto in <br /> precipitation than:(in/mo) Inches(in/mo) <br /> (in/mo) (in/day) <br /> January 4.42 1.24 0.04 3.18 <br /> February 3.20 1.96 0.07 1.24 <br /> March 3.43 3.41 0.11 -- <br /> April 1.92 5.10 0.17 <br /> May 0.50 6.82 0.22 -- <br /> June 0.25 7.80 0.26 -- <br /> July 0.23 8.06 0.26 -- <br /> August 0.40 7.13 0.23 -- <br /> September 0.76 5.40 0.18 -- <br /> October 1.39 3.72 0.12 -- <br /> November 3.31 1.80 0.06 1.51 <br /> December 3.67 0.93 0.03 2.74 <br /> TOTALS(in.) 18.92 53.4 ------ 8.67 <br /> Obviously, significant rainfall and irrigation is recharging aquifers and although there is certainly <br /> over pumping of groundwater, serious depletions leading to extreme declines of water table <br /> elevations would be occurring without this recharge. The yearly total of rainfall exceeding Eto <br /> (8.67')will be used in the nitrate loading calculations below. <br /> Page -5- <br /> Chesney Consulting <br />