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<br />lIJH72
<br />
<br />Figure 13
<br />Grid for Use in Mathematical Modeling
<br />A
<br />
<br />Top VIew
<br />Bo<JI'odaf'/ 01 Aou.ler
<br />
<br />'" !11:
<br />
<br />I
<br />
<br />"T ij
<br /> .J
<br />V ...1
<br />--'
<br />
<br />~-
<br />
<br />Stfeam
<br />
<br />8ou'nodr
<br />y 01 AQuIfer
<br />
<br />"-..'
<br />r
<br />l-
<br />I
<br />~.
<br />.~
<br />
<br />-y(
<br />1\
<br />
<br />^'
<br />
<br />Side View
<br />Boundary A COl1S1d'1t l1ead
<br />A Element element
<br />AQUifer SImulates ,.,0
<br />L-... Element me stream I..}'
<br />
<br />. ':~~-~nrr~
<br />4q \ . ~
<br />v'.~r
<br />
<br />^'
<br />
<br />
<br />t('rns for Jfl!t'r\'t'lI1ng yt'ar". :\ ('OIKNJ1 wa" tht' 1'<1('[
<br />that certam !'TOP'" due to the It'Ilf,'1h 01 their growing
<br />~('a,,(Jn and walt:'r n'n,.:.umptio!1 nlll"_. .....ollld at'ft-n
<br />m"t'TIlII walf'r U"l' mort' ;qgnifi('nntl~ than others. Tbt"
<br />wI'r!:' mad", 10 clt'termillt' Inf' ';lI.:nilicann' of lI:'oillg a
<br />"Jn~]t'ur Illultiplt' croppmg pattern. A~ a f{';':'1I11 ofthn"e
<br />If'';'';. it wa" {h-If'rlllim.d dUll Olulliplt' ('topping pat
<br />tern!' had <lllln,;ignilit'ant Ill1p;WI un the o\t'rall walf'r
<br />rt'quirf'mt'nL~: thl'rt'lnrt:'. a ,;mg][> ('Topping' pnUeTn Illr
<br />the year 197... wa" 1J":'..cl throughout tlw pl-nuo of "t\Jd~'.
<br />
<br />ThE' t'''lilllall' 01 stre1tlllt1uw dt-p]f-lion,.. clU!' to irn
<br />gation i;: (I l'oll1pll:'li pwn'c1uTt, Tt'quiring- in!ornliLtio!l
<br />ahout many intl-rn'!lllecl fal"lor".lndudf'd amoll~ thl'''l'
<br />arl' thl' lIcreage 'Jf irrig-illt-c1 nops, dl'lin'rv and on.fllrm
<br />;:y.-;tl'1ll efliClencit>,.;, and rf'turn tlo\~ dj"trihutioll put.
<br />tern,.. Of yit;}1 impIJrtanct' in thiS ;'stlmatilln i.. the
<br />nup irriJ:(:lllun rt'quirellwnt lClHl,
<br />
<br />In milch 01 the ~li""'Juri HI\l'r ha;:ill. prf-l'ipilatiull
<br />during thl:' l:roWlll~ ..l'a"on i" usually inadt'qualp to
<br />j.!row man~ crop" tll maturity In other pllrt~ of lhf'
<br />blblll. precipllatio!l ma,' he adl,.qU:l1t> on thf' an'rage
<br />hut i" of tell inadpl.juatf- in an~ ont' Yl'ar. Only alung
<br />the eastern piltT of Iht' ha:o:.in i" pn-l'ipilation usually
<br />adE'quatt' fpr.1 widt' rang-E- 01 cmps. For thl:' rf'nlilmdt'r
<br />uftht- h,l..jn. wht're nor mil] prf'cipil:ltlon i" inildt'qullte.
<br />altt'rJunin' mean:o:. of .;upplyin:-; "MI,.fm'tory amount"
<br />of water IS ollt'11 Ileedt'rl, The nop irn!;atiol1 requmo--
<br />mt'nt i~ tilt' additional amount 01 watN, .;upp]if'd
<br />
<br />Ihrl,ugh irrlgaTinn, nt,t'dt-d to ..;upplt'mem th(.t'fft'cti\"{'
<br />prt-npitHtioll to ad..qu:ltf'ly grow a gin'll {.rop to ma~
<br />turit~" Arcur:u.. t'..tlmalt>s olthe ('IH at(' Ile('e,,~ary if
<br />rl;'a]i.;tic irrigawJn of'p]Hinn eqlmlltl''' art' to be made.
<br />
<br />Thi... stlld~ rt'{'ognize" thn.t' inlt-l1..itil''' 01 irrigation
<br />W,HN U"E-: full ,,('n'in-, partial ..;t'n'lrt' and w,lIersptE'ad-
<br />l'r.;. II should lit" ft'a]izt'n thai the nop irrigation re"
<br />qlllrt'lllt'nt ha.. litdt" if any, rdatioflship III deplt'tion..
<br />from watt'r..prt'arling dill' to tht' nature (II thi.; practicl:'.
<br />\\"alt'r...prt'adiI1C r!(-p!f"lIOIl" art' prim<lrily intluE-n('t'd
<br />by tht, a\'iJilahilit~ ('/ \\att'r fllr di,"E-rslon and till'
<br />amount 01 tllO!SUlfl' pr.."t-nt in thl' solis at the time oj'
<br />dJ\l'r~j1lIl, :\cl"ordllllo:ly. \~';df'r"prt'acil'f dt'p]t'tion f'sti.
<br />mat.." \\t.'rt' Ill<ldt- dint'renth-
<br />
<br />~umt'rou,,, mf'th(Id(,I"glt-s art' a,"ai]abJE' for t'stimat-
<br />ing- crnp cOll.-;ull1ptin' wilier us!' or the nop irri!:,8tion
<br />n'quirt'll1l'nt. Gi"t'1l thi' subhumid 10 ..t'll1iarid naturt'
<br />of the :\ll~..ouri HiH'r Basin. it was dN.idNl that the
<br />Blam"y-Cridd]{> and .len"('I1-f!ai..t' methods Iwst rep'
<br />rt',.elltt'd the al'tuall'rop {.(In''lllll!lIin' t1s{' in the basin.
<br />
<br />Tht' "taTe wurk group ll1(.mlwrs st'lertt"d tht' con.
<br />sumpti\"e u"'. Illt'thod l.Jen"t'll-Hais(' or R]ant'y.('rid.
<br />dl{'1 whit'h he..t fl'prt'..t'ntt-d condiTion.. in their ,.tatt'
<br />or pro,'idt'd ,,,ntlnuity with fJlht.'r Ln\'t~"tiJr<l\i(ln~ in
<br />their .;\alt'. The following Ii..! ,;ulllll1arizes thost' SE'-
<br />]t'l'tt-d:
<br />
<br />Colomdll - 11lOdlli..-d H1ant'y.rriddl(.
<br />lowu - I1HlIhfit'd H]arwy-('ridd]t'
<br />Kan,.us - nwdifit'd Hlaney-Criddlp
<br />~linnl'l<ol)la - moditi('(i Rlant'y.rriddlf'
<br />~11...;ouri - modifi('d Blaney-Criddlf'
<br />~t(JI1Tal1a modifi..d Hlaney.Criddlf>
<br />)".ehra"ka ..Jt'n..t'n.l-fal..",
<br />~lJrth !JakOla - oJt'Tbt'n.Hlli"t,
<br />:-::outh O,lkot.l - .1..-nst-n.Haisf'
<br />\ryomin):: - modi/it'd H1nne~,.('fl(]dle
<br />
<br />..\1] Input data and dt'plt'tion t'slimate.. from this
<br />..Illdv <lfe ultimately on a nodt' bll..in has is. ~mcf' many
<br />nod., lra..;ins l'rn~" ..;talt' hmmcinrit'". tht' prob]f'm of
<br />which c<)ll~umpti\'l" use nwthod to u,-!:' for InlN.;ICI[t'
<br />node bil~in" aro~t- ....hen thl"' "Wtt'S IIl\"olvt'd prefE'rrt'd
<br />ddft>r(Ont Illet hod", Thi" on:urred in approximutt'ly
<br />1lIll'.third of th.' 9:, nodt' basins, \\"hl:'rt, this problem
<br />arn..t', tht, mHhod prt'ferrt'd hy Tht' :o:.talt' hll,'ing- tht'
<br />gnatt'..t irrig:ilt'n <Irreagt' in the nodt' in 190R pre-
<br />\"ailt'd.
<br />
<br />E"tllnate" llf ]i\(-..ltk.'k water u.;t' and <Issodated
<br />..Treamllu.... dt'plt-llOn" ....t'rt' mlldt' on 11 monthly basis
<br />throughllut thf' 19.H-197S ..Illdy pt'riod. The liwstock
<br />Ilumlwr (-,-timatt''' WNI;' compilf-d for t'arh of lh'E' cat-
<br />E'l'orit,:o:. a" fl)llow..: 11) milk ('o....s. en all other can It'
<br />and cah-b, nl all ho.:" and pi~.,.. 141 all .;hl:'t'p and
<br />lamb", and l;'il hor.;",,,. ponit>,., aorl mu]t's. Data on live-
<br />"lOck llumht'r.-; wert' Il,'aililhlt' lrom tht' l '.S. Cf'nsus of
<br />Acricullure and the Cllo!wtative ;:Iate Crop and Live-
<br />"lOck Hf'pOrling :-'pryict'.;. E;:timatt';: oflin"tock num-
<br />ber" in nOrH'f'nsu,.; yt-ar.. Wer(' dE'termined hy as..uming
<br />a l'on"tant rlilll:':lf~ ratE' nf annual changf- ht'twt't'1l ('t'n-
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