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<br />XXVI <br /> <br />LETTER OF TRANSIHITTAL <br /> <br />of waleI' released thl'refrom for cnlc-lllnting t,imcs, whell t.he reservoirs, <br />making up project storngc, would ~pill. .. . <br />Ot.}1l'1' urtides of the eornpaet Itnvo l1. dln'c.t bon,rIng on trIll' I'nllltlon <br />between the operation of the San Luis Valley project and t.lw operntion <br />uf the proposed Middle Rio Grunde projcd, <br />Art-ielL> VII of trllc compnd prohihits illcn~nsc in stol'Hge of wt'~tcr in <br />rcs('('\'oirs in COIOl'llclo and Now ::\'lexico cO.'lst.rnetcA nft.or ] 929 \\'11f'n- <br />evr.1' t.here is less t.hfl.ll 400,000 nert~-feL~t of t.he usable wfik~r in storage <br />in Elephll'-ll:, Butte J{esl'IToir. <br />Art.ide VIII of till: cOIII}Jflet provides for the reh:ase of Wllt.er from <br />stol'nge n~sl'rvoirs in Colol'll,do find Nt~W ~:Icxic-o C0.1lst.l'uctpd uftf'1' <br />H129 up to the extll.1lt. of accrued debits against. those Stutl~S Hl the <br />rrrcatest ratf' priLct,j{~H.l under cOll<.lit,iollS then previLiling' in sufficit:'.nt, <br />~mount,s to hring tIw quant.it,y of usable water ill Elt~phnnt But.t;;>. <br />storugtl to OOO,UOO ncn-,.-fuet by i'vfnrch 1, and t.o ohtnin l.hiLt qunnt.it.y <br />in stt1rllge unlil April 30. <br />A study of t.he operntiQ.llS of the project, ns miule by t,he agencies, <br />together \\"ith t.he discussion of t.hose opernLiolls, indicate t.hat it full <br />rrllllzation of t.he t.erms of the compaet ns t.hey apply to t.he operation <br />of tl.u San Luis Vlllll~Y project wns not. hn.d hy eith(~r of the llg(~ncics. <br />The I:,wo agen(:ies mil-de IIUIlL::lrOUS reseryoir operation st,udies. <br />The gross rrrors Illude in various nssumpt.ioIlS of sonw of tlw eurl.y <br />st.udies l'f'sult,cd in C'st.imnt.ing 11 water supply for tJH' projed of 1,600,000 <br />a('rC'~fpt't during t.he pcriod 1925 to UJ42, which did 110t exist. After <br />a sllceessiye series of refinements t.o mnk(~ t.lH~ studies eo.nform mOfP. <br />Benrly \\"ith thc provisions of l.hc Rio Grande eomptwt, antI mol'c neurly <br />with conditio.ns os UH\Y can he expr:H:tl'd t.o be 0.1l the rivl'I', there 1'('- <br />suIted threo opp.rntions: No. I, intended to represent prcscnt, d~v210p- <br />menl ilL Colorado find New I\:Ioxieo nhovt' San 2\Illrcilll; operation <br />No. 2-R, t.O feprcscllt. condit.ions as t.hey would be with t.he aut.horized <br />San Luis Vollt~y projl~ct superimposed o'n pl'p.scnt conditions; opm'ution <br />No. :l-RR, to show eomlit,ions if the !...Iiddlo Rio Gmnde projeet as <br />proposcd were opnruted for Aood-eont.rol purposf's alone. Opcru.tioll~ <br />2-R und :J-RR app'"ar in appendix C, Hydrology of the Corps of <br />Engineers. Opcrnt.iOJls 1, 2-R, and ;3-RR 11ppl'lLr in appendi..... C of <br />tJH--' r(~pm.t hy t.hn United St,tttrPs Bm'3tHl of RnclllIllntioll. Both <br />ageJlcitls disellss the results of the operittions. <br />The Bureau of Rrclnmn.tion indicates that under present conditions <br />the Burmal demand Oll st.oragd hy the .i\Jitldle Rio Grande Conservuncy <br />Dist.riet could be nH~t in n.Il years from EJ Vado Reservoir during the <br />period of study, 19~5 to ]945, exccpt, for the ycars 19:38, 19:19, 1934, <br />and 1945. The total deficiency would be 347,000 acre-fe,'!.. This <br />defieieney may be compared wit.h 11 tout! deph,t,ion by irrigation for <br />the pcriod of [],06:3,300 aere-feet, The stud V indicated thnt, 737,500 <br />acre-feel, of wat.er would be spilled frolll Cab'lllo Roservoir in 1942, <br />It. was found by operat.ion 2-R t.ha.t if t.he SaIl Luis Valley proj(~ct <br />is constl'uctt'd, its operation \,,""ill materinlly relieve the water supply <br />problem of t.he middle Rio Grandt: eonservanc.y project. find it will <br />reduce the amount, of wat.er lost to t.he basin beclluse of spill from <br />CulmlJo Rcservoir. The dcticienev in t.he mitldlf' Rio Grande wat.er <br />supply would be limited to tbe 2.'yc"rs, 1928 and 19:H, with a total <br />deficiency of 157,000 n('.r(~-fc('.t. out of n totol irrigation depletion for <br />tbe period of 11,10,5,200 acre-feet, The Bureau of Rec.lalllatio4 <br />conc.ludcs that under this op,',ratioll the flow of the Rio GrandQ <br />