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<br />(0 STUDY ITEM 8 - IJXATE SITES FOR SMALL SINGLE AND MULTIPIE PURPOSE
<br />"",;tl WATER STORAGE RESERVOIRS.
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<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
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