Laserfiche WebLink
The following Table illustrates rainfall and evapotranspiration for the Stockton area. Precipitation data was <br /> obtained from the Soil Survey of San Joaquin County. The conservative"2 years in 10"data was used and not <br /> the"average rainfall"data. Evapotranspiration data was obtained from the California Irrigation Management <br /> Information System(CIMIS): <br /> TABLE 3 <br /> PRECIPITATION AND Eto DATA FOR STOCK ON, CA <br /> Month 2 Years in 10 will have more Eto Average Potential Deep <br /> precipitation than: (in/mo) Percolation (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 /> This chart illustrates that evapotranspiration far exceeds precipitation, even when using higher rainfall data <br /> that exceeds normal rainfall data by 56%. Only in the months of January,February,November and December <br /> would deep percolation potentially occur. This data illustrates a relatively high potential for there to be <br /> significant evapotranspiration (or bare soil surface evaporation)from a wastewater disposal system design that <br /> may take advantage of evapotranspiration during favorable months of the year. <br /> III. NITRATE LOADING STUDY FINDINGS <br /> A. WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS <br /> Wastewater Flow Volume Projections <br /> To determine nitrate-nitrogen loading from any project, wastewater flow volumes must be determined <br /> as accurately as possible. Flow volume projections will be approximated from the on-site restroom. <br /> 5 <br />