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<br />i;;.t~::':S'.<)-.,,~~..:. 5.5"..:,:.,,<;\--:':::':(" _i.,,-,;C. '''_. :_" ^'-;_.~,> ,<~:;,--;,;:''''.:'- ,'--'':,::----~. - -- '_--'.~'--'W" -'.,~'-,,,,," <br /> <br />i ~ <br /> <br />I <br />.t <br /> <br />.. <br /> <br />l <br />~ <br />~; <br /> <br />, ' <br /> <br />, <br /> <br />~ <br /> <br />, <br /> <br />!, <br />, <br />f, <br />Ii <br />II <br />Ii' <br />I <br />J <br /> <br />i <br /> <br />,',_...', <br /> <br />(0 <br />(0 STUDY ITEM 8 - IJXATE SITES FOR SMALL SINGLE AND MULTIPIE PURPOSE <br />"",;tl WATER STORAGE RESERVOIRS. <br /> <br /> <br />CJ <br />C:i <br />(' <br />........ <br /> <br />Fourteen reservoir sites have been proposed. with the exception <br />of the Culebra Creek site, all are in the closed basin. Two sites <br />are for regulating reservoirs in the San Luis Valley Irrigation <br />District's canal system. Twelve are for seasonal storage. (Loca- <br />tions are shawn on Map-10, sites for Single and Multiple PurpOSe <br />Water Storage Reservoirs.) <br /> <br />Storage water is needed for late season crop irrigation. Water <br />is available for storage during the non-grCMing season on streams <br />tributary to the closed basin. <br /> <br />Reservoir sites are generally poor because of the steep stream <br />gradients and poor tq>ographic, soils, or geological =nditions. <br />Harever, the sites listed in Table 6 are worthy of further study <br />if sponsored by an irrigation ccmpany or individual and sufficient <br />=st-share is available. Additional study and investigations will <br />prooably un=ver sane adverse site =nditions which will result in <br />revised estimated costs higher than those given in Table 6. <br /> <br />STUDY ITEM 9 - EXAMINE CHANNE:LS OF THE MAJOR RIVE,RS AND STREAM3 <br />AND lOCATE SECI'IONS TlOO NEED STRAIGHTENING TO IMProVE DRAINAGE <br />OurLEI'S. <br /> <br />An examination of reports by the U. S. Bureau of Reclamation, <br />Region 7; the U. S. ~ Corps of Engineers, AlbUluerque District; <br />and the Davis Engineering Service, Del Norte, Colorado was made. <br /> <br />The San Luis Valley project, Colorado report y states: <br /> <br />Irrigation in the San Luis Valley was begun in the early <br />1850s, but it was not until about 1880 that extensive <br />developnent oc=ed. Then in the decade 1880-90, <br />accelerated activity resulted in most of the large canal <br />systems and other irrigation works that exist today. <br />This developrrent greatly changed the regirren of flONS <br />of the Rio Grande and its tributaries. During the past <br />eight decades, the charmel of the Rio Grande, in adjusting <br />to the smaller residual flows, has generally deteriorated <br />into a braided, ill-defined water =urse. The sarre <br />phenanena has also oc=red, to a scrnewhat lesser <br />extent, to the channels of the Conejos and San Antonio <br />Rivers. The channels of the smaller tributaries, La <br />Jara, Alarrosa, and RoCk Creeks have been s:iJ:nilarly affected <br />by reduced flCMS and fa:r:ming and ranching practices.... <br /> <br />y See reference 6. <br /> <br />12 <br />