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TABLE 7 <br /> PRECIPITATION AND,Eto DATA.FOR STOCKTON,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 /> I 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 /> V <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 <br /> rainfall data that exceeds normal rainfall data by 56% (8.30 in. vs. 18.92 in.) Only in the months <br /> of January, February,November and December would deep percolation potentially occur, <br /> although deep percolation obviously occurred during the heavy rains of March and April 2006. <br /> This data illustrates there is a relatively high potential for significant evapotranspiration (and bare <br /> soil surface evaporation) from the disposal area. <br /> The following Worksheet is found in A Guide to Estimating Irrigation Water Needs of Landscape <br /> Plantings in California and contains the calculations necessary for estimating the water <br /> 'requirements for a wastewater disposal area that may utilize landscaping such as grass with <br /> applied effluent through a drip irrigation. The greatest volume of water required by the landscape <br /> grass would be during the spring and summer months. Therefore, the total volume of water to be <br /> applied to maintain the grass must be known. <br /> Lrket for Estimating Landscape Water Needs <br /> alculate the Landscape Coefficient (KL) <br /> a: KL= ks x kd x kmc ........................ <br /> es factor <br /> ity factor <br /> roclimate factor <br /> (range =0.1-0.9) (Turfgrasses=80% of Eto) <br /> Page -15- <br /> Chesney Consulting <br />