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<br />HALASl'ISt; A(;HHTI."ITRE ~\: TilE
<br />E!\"nrW:\'.\IE......,.. Vdieient in both rainfall
<br />and .surfan' now.... thi.-; subbasin IX'llefits from
<br />the fa('t that watt'r l'lUl I... oroug-ht in from the
<br />:\lissouri Hin~r. The f,'amt'wOI'k plall hen.
<br />aims at ('xp]oiting thi.s adnultag(~ both to
<br />stabiliz(' tilt' agricultural t:'('ollomy and to pro-
<br />tt'Ct t'1l\'inmrnl'1I1al vaJUt's. p....'lt'dally ('t'rtain
<br />wt'tland....
<br />
<br />B:tsically, this sllbba...in i... a prt'tty g-uod farm_
<br />ing an'a. :\"int'ty-two pt'ITt'll1 of it.... ;)H,:WO
<br />;o;quare mill':; is ill priv,ttt:> fOllln..... Hut the area
<br />is la:iht'tl uy altt'rnating Hoods and droughts.
<br />tht' agriculture is accordingly unstable, Hnd
<br />environmt'ntal \'alut's .In> impaired. This is
<br />t':-Ipt"{'ially true in the area (,I' tht:' Big Sioux
<br />Hin'r, whkh hasthemost -"eH're tlood,,'rosion.
<br />and water-quality probll'ms in the :mbba:-lin.
<br />The flood potentiality is a const.ant threat both
<br />to Sioux Fall:-l, South Dakot.a, on tht, uppt'r
<br />r~.aches of the Big Sioux, and to Sioux City.
<br />Iowa. at its mouth,
<br />
<br />Tht' kpy to thl::' Cramt'work plan in this subbasin
<br />l'onsists of dt>veloping- watpr andlabilitips
<br />within tht' fl'g-ion - not<-lbly its ground-watt'r
<br />n'sourct':' - and pfl)vidill~ works for importing-
<br />WHtt'r frllm tilt' .\IisS1.lUri Hiver tll "''''''''1' both
<br />t't'onllmic alltll'nvinmtlWIlt.al ~llals,
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<br />Thl' biggl':,t of the (,llvisiOllt'd dt'\'I>lopnH'llt:, is
<br />tht, l;arrison Diwr",ioll l'nit. tht' I1r...t ph:i:'..
<br />of which i", alft'ady untlt'r con"truction, This
<br />is ha"ic<llly a l'OlIwyann' mlll rt-'~rulatilln
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<br />:,y"'tl'm for brilJg'in~ l'llough WHtt'r from the
<br />exi"'ting- (;ar!"ison Hl's..n'oir on tht' :,\1i."SlJUri
<br />main stem ultim:ltl'ly to irrig-alt> a milliun
<br />aen's of farmland (2:tI,O(lO lU_Tl'," in thl'
<br />:'\Iissouri Hivt'I' Basin), pn,vidL' munidpal,tnd
<br />industl"ial suppJit'S fur II tOWIIS and cities,
<br />th'vl'lup Ii:! al"'as for fish ,Ull! wildlili.' [m'lloses
<br />(27 in tht" basin), allt! Jll'rmit thet'stablishnwnt
<br />of I't't'l'l-"'atioll areas at !lirh' water impound_
<br />ml'nts within th,> ,..ubb:tsin,
<br />
<br />The Oaht' l'nit similarly would draw watt"r
<br />1'1"1,"1 thl' t'xistillg' (lahl' J{,'st'IYoir !In tht>
<br />:'\Iissollri. This unit would pro\'id.. irrig:ttiun
<br />fo!'J~l;-).IIOI) :\('l't's. walpl' sllJlplil"" for ~:~ l'iUt's
<br /><Lnd towns. {ish and wildlif.. dt'\'t'loPIllt'llt at:!8
<br />IOl'atiIJIl", :me! n.t'J't'atiunnl dl'vdllpment ,It
<br />foul' imjloundmt'nt silt's. Tht' l'nit has 1)("1.'11
<br />authOl'izl1ltJUln"t yet tlt'J-.rtlll.
<br />
<br />Within Ihl' sullb.asin, w.\11'1' sUi'plit's fUI' thl'
<br />il'l'ig:l.tiolJ of l.t~.(lUll acrt'" an' 1'),;pt't'h11 to lit,
<br />dt'\'t'lupl'll thnl\lgh [1I"i\';\tt' systt'ms usillJ!
<br />gT"ulld.wall'l' n'Sl>urt't's.
<br />
<br />:\ !l"tl-wol'thy ft'atur.. of tht' suhba:,in, not
<br />found ill allY of tht, otth'f';. i... thl' potelltiality
<br />tl)1' prl's\.l....ing' wdl:.md... frJl' \\'atert'l.wl habit:tt
<br />alld 0011'[' "l\\'irl)nnlt'lltal PUqItIS"S, The
<br />;\l'lllisitioll and mallaW'IJll'nt of mr'n' th:tn
<br />a million 1tl'l't'S of slll'h ];IIl,\:' is a jll1,milwnt
<br />all(!,listilll'tin' fl'atUI'e 111' the franll'wor-k plan.
<br />\\'t'rt' watt'r supplil's not to Iw mal,!e availablt,
<br />thl1Jllgh thl' importation pI1>~::Tams, lhl'st' wet-
<br />land.'" might f.an' till' IrISS of n:ltin' water:,.
<br />l'ithl'r fur din'l't USt' lJl' thl'''llg'h drain:tgt. df"-
<br />n'!t'pnll'nts to sust:lin thl' l"-'()I1Omy,
<br />
<br />:'\lllCh Iff tht. t'1l\'il'onmt'ntal t'nhalll'..ment ('on-
<br />tI'mplalt,,! in tht, framl'wlrrk pl:lIl will t.lkl'
<br />plal't' ill O\S'''Od.ltion with the wah>r-impol't<l_
<br />tion and Wakr-llH' ft'atul't'l" nfthe plil.ll.
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