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l J.q 7 ~TTER OF TRANSMITTAL 'xv Bonrd and defining its funetiolls. ntld in HLcordullec with t.lIe desig- nat,ion of SlIell bOlll'd h:y the Go\'(-'rnor pursuant. to sl'etioll ] of till' net of Dt~('rmhnl' 22~ 1944 (58 St.nt. 887)~ us the officinl SI,al,e agency t.o !let ill sueh Inn.t.tt-'l's. Tile Ullited SttLLes Burl'utl of Her]nIHlItioIl, Depul't,ment. of the IntL'riol', lias also pn~p~ll'erl f1l'epurt nil the mitldle Rio Grande }.H'l)jeetr. Till' report, is known llS Pl'Ojcet Planning J{cpoJ't 5-15.1-2, and is eutitled "Plan for Dl\\"clopnwllt, of Middle Rit. Grande Project., Hio Grulld(' Bnsill. N. ~-I(~x." Bolli the Army nIld Rt~damlltioll reports desnibc fl unifit'd plan of development. The COHlIncllts of Colnmdo with respect to tl](~ BlII""tLu'S plnns lll'e idt:ntieal with l,he t'nmments with respect. t.o t.lw plnn proposed by tlw Corp~ of ElIgincL'rs. Com- IHents on the report {If tllC Corps of Engineers ilre beiIlg suhmitted to t.lle Scc-I'l'truy of t.he Armv. TlJe ('oml;it~nts of Coloi"lldl) do not npply to t.lw BIlle \\-fltl~r-Toltec fil'l':l. SUMl\l,\HY OF COM.l\IE.:NTS, VIEWS, A['I;D ItECO.Ml\IENDATIONS ]n genel'u!. Colorado cOIJcludl'S tilllt the. plum:. lHOIJos('d by the two agencies U1'C ndeqwlte to sol H.' the most pressing- pl'oblt'ms ill tIll-' urea nlong t.he Hin Gmlld(~ ill New ~It'xico lllHl above Elepllant Butte H:e~cl'voir. It. cOlleJudl's. llnw(-'Yt'l'! l.hnt th(' lUnOlJ11 t, of flood-cont.I'ol cllp:lcit.~r l'e('oJlulle.t\(kd \S l:on'6id(~nlbly in ('x(~ess of t.hnl l'(~~\sonnbly required, i~ ll1wcollomic lWei. if pl'o\ridpd. woul(l cOllstitut.e a threat to the prop<<'!' opemtioll of tIle San Luis Vlllley pl'oj(Jd! whieh was Hut.hol'iz('d in 1040 fol' constru('tiot1 (H. Do('. No. {iO:L 7Gt.h Cong., ;~d ~(,Sf..). (.d!tlrndo n~("lJuIJlleTlds Lllllt tile report not. be tJ'Hllsmit,ted t.o COllgrt..ss unless th(~ n~qllisitl~ 1'0IT(;(;tio(1:", JHodificutioJl~~ nnd llddit.ioll~ lire made in lLcc:ontalll'u wit.h the views ilnd rC'l.'\mllnendnt.ioll~ (~oIltnint~d h('rt,in. As 11 SlIllllllilJ'Y of t.he dctllill'd \'i(~\\"s Hud reeommcndntiolls hCi'C-'in- llft,(-'I' l..'onll1ined,. Colomdo ~llhlY1its~ I. The Illiddk Rio Grundc Vflll(~y of New ~'f('xi('o ('xt(~llding: from COl.'hit.i to Sllll .l\.brei!ll i~ t'onfront,cd \vitll 11 S(~riOllS problem ellllsed hy {,he deterioration of dra.ins tOIlSlrtltt,t-'d I1S 11 part of the "fiddle Rio Gl'lllHle COIlSl'n.;lllc.v DisLril.'L project.. This dclcrioJ'ntioll is dne t,o t.lw laek of Jllnil1t(~llllnl'(' llHd to t.lle Hggradntiol1 of Ule rivcl' ('.hllllllP'1. 2. The StlLte of Nl'\\' Slexico. bl~tl1use of tlw t(llldit,ions in t.hc middle Hio Gl'llndl' \Talk" lint! t.he riv(~l' cl)ndit.ioJls bct.wt:(~lI San ~.rurcinll1lld ~1l'pIHlllt Butte Reservoir, eanI1ot. at. J)f'(~sellt. meet. its oblignt.iolls lIlHI(~r t,lll': Rio Grallde. cOl11pnct, :lilt! lit. the sa.llle- (.imp rnukp free 115(' of t.he El Vndo R\~s\;'-l'voir (;Ol1st/'l!ct.l'.d h) Senrl~ tIlC llliddll~ Hin Grande a.1'l~1\. This is bCCllll~e (If the lnrge loss of \\::1 ter l'e~lllt.ing fr\JIll t,lle st't'ped condit.iol1 of t,ll(~ middle Rio C-i-I'allde YnlJey~ t.hl' ngg-mdcd channel, t.he lilrge f;on~umpl,iol1 of ~..:llt('r hy t.ht~ al'l~f:S bdo\v Sun :\11\.J'\3ial which tire pCl'(~nllilllly fluoded) !lull t.lle.largt.' tnln~pil'lltion cOllsumpt.ion by Illltive \'egl't:ltioll. 3. IIlundntion llnd scour due t.o flood flows in t,he !ll'C'U along the Rio Gl'filldc in NI.~W 1\Il'xico llhO\"l~ Eleplw.nt. But,t.e Rl:scrvoir' nre in!})()rlnnt prohlems but are minor cmnpnrl'd with the drainn~e problem und t,he mninl.ninillg of an ndcLJlIute ri\'l:::r chftlllld. TlH' mo~t seriolls Aspect of the flood.coIltl'ol problem is t.he l'lUT.\Ting' of sedill!(.'nts by flood wlltL'r which ellU::;p the Itggr:Hlntioll of the rin'r dlfillllPl.