Laserfiche WebLink
TABLE 4 <br />PRECIPITATION AND Eto DATA FOR TRACY, CA <br />Month <br />2 Years in 10 will have more <br />precipitation than: (in/mo) <br />Eto Average <br />Potential Deep <br />Percolation (in/mo) <br />(in/mo) <br />(in/day) <br />January <br />2.93 <br />1.55 <br />0.05 <br />1.38 <br />February <br />2.21 <br />2.24 <br />0.08 <br />-- <br />March <br />2.38 <br />3.72 <br />0.12 <br />-- <br />April <br />1.51 <br />5.10 <br />0.17 <br />May <br />0.71 <br />6.82 <br />0.22 <br />-- <br />June <br />2.09 <br />7.80 <br />0.26 <br />-- <br />July <br />0.28 <br />8.68 <br />0.28 <br />-- <br />August <br />1.05 <br />7.75 <br />0.25 <br />-- <br />September <br />0.84 <br />5.70 <br />0.19 <br />-- <br />October <br />1.06 <br />4.03 <br />0.13 <br />-- <br />November <br />2.10 <br />2.10 <br />0.07 <br />-- <br />December <br />2.38 <br />1.55 <br />0.05 <br />0.83 <br />TOTALS (in.) <br />13.18 <br />57.0 <br />------ <br />2.21 <br />The Table illustrates that evapotranspiration far exceeds precipitation, even when using higher <br />rainfall data that exceeds normal rainfall data by 28% (10.33 in. vs. 13.18 in.). Only in the months <br />of December and January, and possibly November and February would deep percolation potentially <br />occur. <br />Since there will be landscaping grass over the wastewater disposal area, this data illustrates a high <br />potential for there to be significant evapotranspiration from this grass and consequently must be <br />irrigated carefully. It is imperative that the lawn clippings are captured and hauled off-site and not <br />allowed to fall back onto the lawn. If lawn clippings fall back onto the lawn, this completes the <br />nitrogen cycle and contributes additional nitrogen to the system. <br />I2 <br />Chesney Consulting <br />