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<br />I~~J) <br /> <br />~;, <br />)'- <br /> <br />~ <br /> <br />~. <br />~ <br /> <br />t_" <br /> <br />~~ <br /> <br />I <br />\ <br /> <br />;; <br /> <br />distance of two to five 'ciles, from the point where it enters the basin <br /> <br />r~ <br />~""' <br />N <br />N <br />'..:J <br />,,-, <br /> <br />near the town of Monte. Vista southeastward to a point below Alamosa. <br /> <br />This <it vide converts the northern part 0 f the valley into a basin that <br /> <br />is "clos ed" so fur as natural draip-<.-'l.ge is concerned. <br /> <br />Within this closed area such of the waters of the local streams <br /> <br />nnd of the diversions from the Rio Grande as are not consumed in irri- <br /> <br />gation and by nnturnl growth or by evaporntion, finally find their way <br /> <br />into a low tr ough parnllel to the foot of the eastern rnnge. There, in <br /> <br />seasons of abundant runoff the waste vmters collect in numercus small <br /> <br />lakes, swamps, and lcw water-logged areas. In seasons of moderate run- <br /> <br />off the arens of free water surface and s,~p are greatly diminished. <br /> <br />After a series of dry yenrs, San Luis and Head Lakes constitute the <br /> <br />only free water surfaces. The ,mtBr table throughout the trough is <br /> <br />ordinarily relatively l1igh, and it has been aSS\.nlled that n large sump <br /> <br />drain fOllm'ring so uth through the trough, and emptying into the Rio <br /> <br />Grande, vdll oontinuously salvage a considerable amount of vmter that <br /> <br />is now lost by transpiration ffild evaporation, and thnt in years of high <br /> <br />runoff a large amount can be salvaged in this way. The water delivered <br /> <br />to the Rio Grande from the drain will flow downstream across the <br /> <br />Colorado Stato line for Use in N~v Mexico and Texas. <br /> <br />Prospective constru.ction of this Son Luis Vall~ Drain is pro- <br /> <br />vided for in the Rio Grande Ccmpact among the states cf COlcrQdo, New <br /> <br />Mexico and Texas, and the United States, for the Rio GrQnde (46 Stat. <br /> <br />767) .vhich reads in part as follows: <br /> <br />"Colorado shall not be denied the right to divert, <br /> <br />store, und/or use water in additional amounts equiva- <br /> <br />lent to the flow into the river from the dro.in from <br /> <br />the G.lo86d Dad1i;" <br /> <br />3 <br /> <br /> <br />