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<br />t;"""" <br />~"tl:.~"'] <br /> <br />~ <br />;,< <br /> <br />. <br />~:; <br />\ <br /> <br />j::. <br /> <br />~', <br /> <br />I' <br /> <br />! <br /> <br />'1' <br /> <br />;,':':'_.-.! <br /> <br />", ,'- ~^"' ,"'-~. '""'C -"""'""';'<'_" -o:-:~, ]..~(_,~,~\.'i" - <br /> <br />co <br />'.::7) <br />C\.: <br />C'J <br />,;... El Petso for irrig<ltion, Mr. C. S. Scofiold oi' tho Burce.u oi' Plant <br /> <br />''lith rego.rd to tho suite,bi.lity of Rio Grnndo w,,-tors c,t <br /> <br />c.~:. <br /> <br />Industry, in et lotter to tho Burce.u oi' Recbnc,tion on Soptomber 4, <br /> <br />1924, st"ted in p".rt "s i'011007s: <br /> <br />"As :J. me.itor of' actual irrigo.tion practice, I fool <br />thnt there would be SOY"" risk in usine; water cOlltc.ining <br />much over 2,000 po.rts por million, unlos8 drninc,go con- <br />di tions wero slwh that it could be used rnther cxcossivcJy <br />without dnnger oi' 'No.tor logging the subsoil. Evon with <br />vm.ter contr.ining 1,000 pe.rts por million such "s tho Rio <br />Grnndo r.t El Po.so is reported to contnin, I should i'eel <br />thnt it Wo.s advis"blo to usa it o.bundnntly so "-s to be <br />sure that SO:r.lO pcrcolr"tio~ occurred f!.t loast occnsio1jnlly <br />in the arons whore tho silt bla.nkct is tll0 tl1ickest." <br /> <br />Under these circuT1stm,-ces, it co,n bo so.id of tho effect <br /> <br />of substituting dr"in w<ltors i'cr presont Rio Grc.nde 1imtor, only <br /> <br />thnt i t 1~dll incroo.so tho manaoe of snIt concontrc.tion on tho Hio <br /> <br />Granda project, but s'.lch incro"so wi 11 not bo of r,n oxtent to <br /> <br />cau s e ft.l CLr:r.1. <br /> <br />JUS'rIFICI,TION OF COVSTRUCTION <br /> <br />At r,n ostim.ntod cor,structi on cost oi' 'i5BO,000 o.nd ",ith <br /> <br />an mmuo.l cost of 1':10,000 i'or T1o.inteno.nco, o.n estimatod o.nnu"l <br /> <br />;,'iel d of 40,000 o.cro i'oet is to b 0 s ocured in pori ods oi' mocorccto <br /> <br />runoi'f. In periods oi' bettor run.oi'i', lo.rgor yiolds T1ny bo ox- <br /> <br />rootod but tho succossivo incrcr'1ents of such incroc.scd yiold hc.vo <br /> <br />0. continuously diminishing v"luo. <br /> <br />The cost per acre foot of v~ter thus developed in the <br /> <br />San Luis ValIey in years of T10derate i'low will then be )14.50 i'or <br /> <br />construction of drain, and 25 cents per ,rear for mainter.ance. Ii' <br /> <br />such Trater Were acquired under the terms of the ReclarJati on Law <br /> <br />25 <br /> <br /> <br />