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<br />c...~ <br />CO <br />\,1") <br />..,..-4 <br />:':-J <br />C' Infi It...ation Estimates: <br /> <br />Figu...e 2 shows the appl ication infi It...ation ...ates fo... the va...ious <br />sites monito...ed in 1990. F...om these data, the appl cation <br />infi It...ation ...ate fo... the diffe...ent soi Is monito...ed is p...ovided in <br />Figu...e 3. The appl ication infi It...ation ...ates have been ext...apolated <br />f...om the individual site summa...y data p...ovided in Appendix B. The <br />i nf i I t...ated depth was d i v i ded by the numbe... of hou...s pe... set to <br />dete...mine an appl ication infi It...ation ...ate in inches pe... hou.... <br /> <br />In the above calculation, the wetted pe...imete... was not taken into <br />conside...ation and the data shown is based on 100% wetted ac...eage. ~n <br />the G...and Valley, it can be safely assumed that with fu......ow i......igation <br />the wetted pe...imete... is actually less then 50%. This means that the <br />app I i cat ion i nf i I t...at i on ...ates p...ov i ded in F i gu...es <~ and 3 may be <br />doubled fo... sites with eve...y ...ow i......igation to get an estimate of <br />ave...age soi I intake ...ate <This is a conse...vative esi:imate based upon <br />hav i ng on I y ha If, 50%, of the so i I su...face actua II y wetted and the <br />appl ication infi It...ation ...ate based upon total, 100~:, wetted su...face <br />a...ea). Alte...nate ...ow i......igation is also fai...ly common in the Valley <br />and with this method the wetted pe...imete... may be assumed to be about <br />25%. The appl ication infi It...ation ...ates p...ovided in Figu...e 2 may be <br />multipl ied by a facto... of fou... when deal ing with ali:e...nate ...ow <br />i......igation in o...de... to estimate soil intake ...ate. <br /> <br />Infilt...ation ...ate fo... the fi...st i......igation is gene...ally highe... fo... <br />annual ",ow c...ops, but not necessa...i Iy so fo... pe...ennial c...ops (Figu...e <br />2). The monito...ing data indicates that fo... some soils such as F...uita <br />clay loam and Mesa clay loam, the infi It...ation ...ate may be highe... than <br />cu......ent estimates. Monito...ing data f...om 1985 to 1989 wi II be ...eviewed <br />and analyzed to dete...mine if this is t...ue. <br /> <br />32 <br />