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<br />Figure 33
<br />Western Dakotas Subbasin
<br />1978 Level Depleted Streamflow
<br />Missouri River at Fort Randall Dam, South Dakota
<br />1944,1960 and 1978
<br />
<br />~
<br />
<br />~ H SubbasIn H,stonc Deplet.on
<br />o - H'StOOC StreamtlQw
<br />~ ~ SubbaSlr' 1978 level
<br />E .Q€'ptel()f1
<br />~ 1978 level
<br />t) Deplete<! SlreamtlQw
<br />
<br />:::l} R
<br />A~~,..ge HIS/OrlC Srreamflow 7944 19~B I
<br />20.000 , 18.560.000 A F I
<br />,
<br />"
<br />
<br /><:> 16000
<br />" .
<br />,
<br />~ ".000
<br />
<br />8000
<br />
<br />A~erage 7978 Level Depleted Streamllo"" 7944 7978
<br />
<br />18430.000 A F
<br />
<br />F-
<br />
<br />'.000
<br />
<br />19.j,\
<br />
<br />1960
<br />
<br />1978
<br />
<br />Yea'
<br />
<br />Eastern Dakotas Suhbasin
<br />
<br />Thf! Ea~!f'rn I )flko!a,.; :-luhbll,.;Jn CO\l:'r,. ;-,."i.2~"i ,.;quare
<br />mi]",.; In th{' n"rth..(t,.;(t'rn part of thl:' \h,.;,.;ouri RI\'t-r
<br />ha~ln. Fi~'lJrt' :1.1. Tll(' prinripal river i,. th{'.Jam{'.";. with
<br />lhe \'{'rmillion and Big :-iinux ;I]"" impnnillll Irihu.
<br />li'lrie,. tn th.. \ll""'luri HIH'r. Tht. m,,"t "trikin.:: fealllrt'
<br />01 th.. "ubha~ln i,.; it." !laIn",."". Thl' "tn'lI111 gradient lit'
<br />thf' .'amf!~ Hin-r in the {'elltral parI of tht' ba"in [1\-
<br />erage" ahoul .(I~, {f'et l)tor mil/:".
<br />
<br />Tht' majOrity 01 the ,.;ubha,.;m ]ie~ in ;\orth and
<br />:-iomh Dak(llll with "mall arbl..; In \tlnm',.;llla. ;\e-
<br />hra"ka and Iowa.
<br />
<br />Tht' prt'dollllll:llt. t.Co"y....tl'm i,. .I!:ricuhura] with
<br />"mall grain". roy, crop" and fllbllln' pru\'idmg the nw
<br />joril~' of tht' land C()\t'r. Limiled Mea" uf nati\"{- prairie
<br />do nowe\er "till exi"t. \\'(l(ldliind~ art. ltmllt'd to farm-
<br />,.tt'ad ,.;Iwht'rhf!h" or along "tn-am". In thi,.; ..;llbhibin
<br />farming dnminall'~ thp t'(,OllOmy.
<br />
<br />Th... ~rotlnd waH-r .";OUn'l' I,. ,.Ilml'whatlimited in thi~
<br />sllhbasin and tnt' quanlll~' of I"rllllnd watt'r varlt',. Irom
<br />aquift'r 1<1 aquifer. Irrigation i,. tht> major ll"t'r "I
<br />ground watt'r in Iht' ,;uhha~ill.
<br />
<br />:",
<br />
<br />:-<urla('(' \\lltt'r "rj.::in.ltt-~ a,. ,.;1\11\\ C/lH'r or a,.; "prmt-:
<br />and sumnwr thund(.r....tnrrn,.. ,.\'" i" typiral in art>a" uf
<br />nmllllt'ntal cltmall;'~. prt'{'ipllatlon i,.. hignly variable
<br />(l\er Iht, ,...a,,'-H1~ and {rllm \t'ar to \t'ar. Th.. point
<br />~t'Jl.(.tt'd as tht' "\lriat't' w8le'r (IUln,,~\ point for thi~
<br />....llhha"in i~ the l':-i(~:-; .~ac:e nllmllt'r 1)(,41<.(-)1100. :'\Ii".
<br />,.:.ouri Hi\(-f at :-iiollX Cil~'. 1,,\\,11. Ttw drainagt' 8rp8
<br />ah<l\e that pllirll is llPproximatdy :lj.L!,II(J ..;quart'
<br />milt,,,. For Ihl: 19.11 In 1~!';.., pc-rind 01 n't'e,ro. the 8\'.
<br />('r1lJ.:t' rel'or/il.d ,.;lrearnt1nw at Ihal pomt wa" aO.Ofi:l
<br />Lt.,... or ahuu! :?1..., million 1!C1(..r't.t'l annualJ~'. How-
<br />t'\er. Iht. lllaJ'lril\ oj that tlow nlllll''' from th{' uppt'r
<br />rt'.1t'hl'" <It Ilw \!i"."ouri HI\t'T iiS Ih.. a\t'rage !low ul
<br />Ihl' .!.lIm'" HiH'r Iwar ~(,Illlalld. :-l"lllh [lakola. i~ ()nly
<br />:?7Ii,OIlO ant'.fef'! annually
<br />
<br />I'r..,.t'nt]y tfwrt' art' no 1lI1pr>rt.S or exports 10 or from
<br />thi~ ,.uhlmsin, On/;' major rbt.rYtlir I" ]lX'ath'! in tht'
<br />..;\lhhll~Jll. that i" (;<I\ln,. 1"'1111 Dam and il::' re,.;l'r\"oir.
<br />l.t'wi.~ ,md Clllrk I.akl:. TIlt' r;.~l:r\"(Iir. wilh 11 normal
<br />t'apiln!y (If :,li11.OO(l arrt'-ft'l.C I,; Itw ..;lllHlIf'st of lilt' six
<br />\Ii""ullri lllillll ,.It'm r(,',.l.r\"oirs "I'l'ratt.d hy th!:' Corp...
<br />u! Eng:im.,'r". II is 11]"0 tht. !urtht.re"t duwt1"lr/;'am of
<br />Ill/;' \li",."uri Hi\"t'r re,.t:'r\olr" on Ihe mam ,.;Il'm.
<br />
<br />;\{.tl-\"all"nttlon lnllnl he "llrJ'at.t' 'fll.t.wi~ and Clark
<br />I.,lkt, i,.; t'."timatt'd In <lH'ral!ell.:ltfI1 arre-f('l:'t !wr
<br />~t',lr,Durlng- the .Jllh 10 (klullt'r pNilld ll1"nthl~" nt't
<br />t'Y1lp'lnui"n lnlm that n.""r\uir i.. apprn"imately 7.0\10
<br />ant'.lt't.t !wr lllOJ1ln. ;j~ shown in Fiplre ;1;J. E\"llpO'
<br />ration from ,Ill ..;IIlall rt.......nnir-. in tht' ~uhhasin av-
<br />t'ra~(,',. ahout :!:?SOO l11'ft~.ft'cl ann1Jall~'.
<br />
<br />A,.; dt'"cribt'd blrher. waiN in tilt' :-ilal/;',.; of :\'orlh
<br />and :-i"lllh Dakota i" c"n"idt,rt'd Pllhlit. and i" appro-
<br />I)riatt-ll undt'r ..;Iillt. p(,'rlllJtling: pnft.t',.....t.,..
<br />
<br />In Ih/:" E,blt'rJ1 Dakolil" :-;\1bha..in. for 1!-t7S. th(,' ma.
<br />Jur wat..r \1."t'r \\'11,.. irrig:alll>1l whirh HCrOtlntt'tl h,r on.r
<br />1;7 I1t'1('O'nl or tnt- loW] ,;trt',llnllnw dpp]t>lint1:--. Fij..'l..lrt>
<br />
<br />Figure 3S
<br />Average Monthly Net Evaporation
<br />Lewis and Clarll: (Gavins Point Reservoir)
<br />
<br />uOOOQ
<br />
<br />120,000
<br />
<br />1 00 000
<br />
<br />80 000
<br />
<br />~ 60.000
<br />,
<br />
<br />.
<br />t. .\0,000
<br />,
<br />
<br />20000
<br />
<br />OL
<br />
<br />20.000
<br />
<br />.10.000
<br />
<br />.~
<br />
<br />..
<br />
<br />------.-
<br />
<br />Jan FeC Mar Apr Ma~ JuJ'1 Jul Au<;j Sep Oct NO>' OE'C
<br />
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