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<br />adjacent to the area. were ey"m1",ed carefully to e] im1"s.te wells which gave
<br />evideJ1ce of be1ngafi'ected by extraneous surface flows. Eleven wells were
<br />selected as accurately refiect1ng t~, fiuetuatioJl.s of the ground water
<br />table :l.Jl. the salvage area. By COIlBtructioEl of Thiessen polygons, the
<br />probable area over which the fiuctuatic:ms recorded at ea.eh well were
<br />representative was dete1'lll:iJl.ed.
<br />
<br />The hydrOgraph of well No. 707, Figure 3, is typical and is
<br />shown to illustrate tll.at dur1Dg the nOllgrowing season, waen there is little
<br />or no e~potrauspiration, the water table Tises rapidly. Conversely,'
<br />du:l.lIIg "the growing seasoa, the elevatiOli' .of ,tlae water table dilll''''1shes ~
<br />Byextrapolatillg the averae;e rate of rise dur1ng the a~ 'SeMOJl
<br />thrOugh the growing sell.llOD., ad correcting for the r!...."lgt' in water table
<br />ele~tio1lS, the avera@! sad ll.Il.Jll.ial aet. rises 'were detel'lll,1ned for the'
<br />,ll_lls, with the aetu4l work beimgdoJile ll.ll illustTatea.' OD. the hydro..
<br />gN.ph. i'he, .et rise thttsdeterm:l.Jl.ed represents the depth of the soU
<br />fromwidchwater was removed by evapot1'll.Jll.spiratiOJl. " '!ro ,COJlvert tlae aet
<br />rise to deptll. of water, tlae aet rise was multiplied by a saturatiOD"
<br />ilIldex," wideh ,is approxilllately equal to poI'QsUYlIliaus wiltiRg pereent-
<br />ase. Bepres...tative indices for til.e. Valley were fOUllld ,to average 29
<br />per.eeat :l.Jl. 'previoQ studies made "in 'eolUl.eeti01!l. witll. the Closed BaIil:l.Jl.
<br />>>:t~sioa. The cO.lll'putati<>>>,s, of avez'age aII.lI.uaJ.aet evapotru,spirat101!1. h
<br />tlaeMosea~SargE!ll!.t arEilll.elre s4own:lithe following tabUlatiOD.
<br />
<br />Area
<br />Area Aerell
<br />'Or (2)
<br />
<br />183 1,510
<br />185 2,180
<br />694 3,300
<br />7f1t '1,570
<br />1150 3,310
<br />'711 . '1,270
<br />715. 1,350
<br />t17 3,180
<br />720 1,560
<br />722 2,490
<br />725 1,320'
<br />Total 23,olie
<br />
<br />l'erceat
<br />of Area.
<br />(3)
<br />
<br />6.6
<br />9.5
<br />14.2
<br />6.8
<br />14.4
<br />5.5
<br />5.9
<br />13.8
<br />6.8
<br />10.8
<br />5.7
<br />100
<br />
<br />~':_"-."-.L2":-/'-
<br />
<br />1949-1952
<br />Average Armual,
<br />Jlet Rise
<br />(feet)
<br />(4) .
<br />
<br />2.50
<br />2.38
<br />2.64
<br />3.90
<br />3.08
<br />3.52
<br />2.84
<br />2.52
<br />2.87 '
<br />2.96
<br />1.04
<br />
<br />1949-:1,.952
<br />Average AuuaJ. Jlet
<br />Evapotrusp1rat1oD
<br />of s:rou..d
<br />we.tI!r
<br />(acre-feet)
<br />(5) ,
<br />
<br />1936-J.,960
<br />Average ADuaJ.
<br />Jlet Evapotrans-
<br />piratiOD of
<br />groUI:I.d water
<br />(ac:re;;feet)
<br />(6)
<br />
<br />1,095
<br />1,504
<br />2,5~
<br />1,774
<br />2,957
<br />, , 1,295
<br />l,ll3 '
<br />2,323
<br />1,297
<br />2,,137
<br />, .398
<br />18,419
<br />
<br />.-g.'6 H~C.,
<br />
<br />20,347
<br />20,300
<br />(RoUI:I.ded)
<br />
<br />2-, () /, __~'?-_.C:: _
<br />",_d' __ _ ~
<br />.2 3... 0 .-.; 0
<br />
<br />.As showa h the above tabuJ.atiOJl, tlae average ll.IUlual net,ev&pot:ra:all_
<br />PiratiQll of ground 'Water for the 4-year period 1949 through 1952 is computed.
<br />to be 18,419 aere-feet,..d for the 25-year period 1936-1960, 20,300 a,cre-
<br />feet. Tke ratio of average 1lJIlI.us.l net evaP01;rim""~t10l11 tqr ,tJm 25-year
<br />
<br />Rev. 10-29-64
<br />
<br />II
<br />
<br />r-'" ~~..:: ')
<br />l,..' 00...
<br />
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