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<br />~-ni)-"-:-n <br />U"""'.o.v <br /> <br />57 <br /> <br />hils been raised sufficiNltly, it is rnnintained by small Hows in IIsuh" <br />ditches which un' spacf'd 20 to 50 {ect 011 rcnters nnd ure about 18 <br />inchl's deep. "'Ilter seeps from these ditches InllintHining the wuter <br />tnbll' withm reach of the plnnt roots. Thus, the diversion require- <br />llH'nto'3 hllYC beNl lldjustNI to the str('urnflow pattern, nnd there is <br />little J{,llching of plnnt 111ltripnt.s from the highly porous oil. During <br />limps oC drought, the lllrge ground-water body is tllPPl>d by mellllS of <br />\\"plls nnd pumps. The f{'sultnnt lowrring of the grouud-\\"nter table <br />causes u de('fcnsp in crop production and it higher production cost. <br />Arcns with tighter soils oontinu(' to be surface irrigut{'d. Owners of <br />('ertuin lands in the vicinity of ~IOSCll tlnd Hooper continue to exercise <br />their wnter rights for irrigation nlthollgh the lack of drninnge facilities <br />hus incn'll.sNI the alkalinitv and salinitv of the lands. The numerous <br />surfuce irri~lltion systems -in Hw vnll(>}: are owned by irrigation dis- <br />tricts and mutulll compnni(.g which operate the dh'crsion, distribution, <br />and u fe,..' stofflgl' workg. Some wnt.er users, in un effort to achieve a <br />fulllllld regulated snpply, IllIlY receive water from SCVNlll systems. <br />The chief cash crops growll in thl' vulll'\, und('r irrigat.ion arc Irish <br />potutocs, lettucf', cllbbaf."e, cllulifiower, ami 'pens. Approximately 10,000 <br />cllrlonds of potntof's llnd 3,000 ("nrloads of vt'getnblrs are shipped an- <br />Ilunlly. ~fnlting hurley is OIW of the newer cash crops, the llcrcage of <br />which hns heen expanded nnTlllully. Other crops are primarily forage <br />aTld grnins to sllstain the livest.ock industry of the ndle)", There is <br />('xtt'nsive irrigation of IHLsturl's in order to incrt'll.se the carrying ca- <br />pacity for Ihcestock, pl1rticulurly in the Clost.d B!lSin. <br />As 11 r('sult of the f'xt{'llsion of irrigutioIl throughout the valleYJ <br />there hilS Ilrisen It Iwt'{l for drllinage works to provide a more fnvor- <br />able suIt hlllnIln' unci control of ground-wuter table thus making <br />possible the continul'd producti\'ity of the Illnds. <br />