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<br /> <br />. <br /> <br />. <br /> <br />. . <br /> <br />( <br /> <br />Engineering <br /> <br />A reconnaissance of the watershed was made to locate potential <br />reservoir sites. Sites on Saguache Creek, Sheep Creek and Middle Creek <br />were considered. The Saguache Creek site was selected as it has the <br />. greatest yield potential for storage of the three sites. tlith the <br />Saguache Creek reservoir it is doubtful that additional water is available <br />for storage above the irrigation demand. <br /> <br />Cost estimates for the reservoir are based on physical data from <br />the USGS 7.5 minute quadrangle sheets, quantity estimates based on pre- <br />liminary design and estimated unit costs for contract work in the araa. <br /> <br />The irrigation demand was developed for grass hay and pasture using <br />consumptive use developed according to TR-2l and estimated field and <br />project efficiencies. Reservoir operations studies with 50% ,and 70% <br />chance supplies were made to give a preliminary estimation of the storage <br />capacity needed and the acres that would be provided a full supply. <br /> <br />Canal rehabilitation cost estimates were developed from par a~ <br />costs of rehabilitation of other systems under P,L. 566 watG~shed p~ojocts <br />in Colorado. <br /> <br />( <br /> <br />Work plan developmant will include: (1) a detailed survey of the <br />reservoir site; (2) an extensive water management study to determine the <br />effect of improved practices on the water table and crop yields;&nd <br />(3) surveys of the irrigation distribution system. <br /> <br />Geologic Investigations <br /> <br />A brief preliminary geologic investigation was made at the Middle <br />Creek, Sheep Creek and the Upper Saguache Creek sites. A backh~ was <br />used to dig test holes in prospective bo~ areas so field classification <br />of the materials could be made. <br /> <br />During work plan development, a geologic map of the reservoir site <br />tIill be pNlpaNld, and several Nlpresentative samples of borrow matorial <br />will be submitted for soils laboratory analysis. Sufficient investigation <br />of the site will be made to assura: (1) reasonable estimates of foundation <br />strength; (2) need for foundation tNatnr.mt; (3) emergency spillw<::y <br />stability; and (4) availability of suitable fill material and its <br />stabili ty in the etilbankment. <br /> <br />0672 <br /> <br />(~ <br /> <br />10 <br /> <br />