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<br /> <br />. <br /> <br />. <br /> <br />/- <br /> <br />within the Saguache \latershed. The dollar return with project conditions <br />has not been calculated for the project. An estimated return was cal- <br />culated showing the agricultural water managemant phase of the project <br />is feas ible . <br /> <br />Floodwater, sediment and erosion damages were not established for <br />this report. rlith only 33 percent of the watershed reservoirad, damage <br />reduction benefits will be minor compared to the agricultural water <br />management benefit. <br /> <br />Preliminary investigation indicated that a single purpose structur3 <br />for floodwater damage reduction benefits would not be feasible. There- <br />fore the purpose of this preliminary investigation report is to provide <br />the sponsors with sufficient cost estimates for a project that would <br />maet their objectives. From this estimate they can make a decision as <br />to their willingness to continue with project developmant. <br /> <br />Further work plan investigations will include: (1) a review of <br />more intensive use and yields with and without project conditions with the <br />State Conservation Agronomist and State Soil Scientist; (2) interviews <br />with flood plain operators to establish damage rates for floodwater, <br />sediment and erosion damages to land, crops and irrigation facilities; <br />(3) investigation of past damages in the Town of Saguache, &nd probable <br />/-- future damages; and (4) investigation of damages to roads and bridges. <br /> <br />Hydrology <br /> <br />Floodwater storage requirement for the reservoir was developed <br />according to criteria in Chapter 21, Sect. 4, National Engineering Hand- <br />book. Irrigation storage requiremant was estimated by making an operations <br />study of the project demand, the total yield and the storable yield <br />above the reservoir. Total yield is based on the Saguache Creek guage <br />records which measure the majority of the source araa of the watershed. <br />Yield from above the reservoir was developed by prorating the guage yield <br />to the tributaries. The proration was made according to elevation, <br />exposure, cover and area of the trib~tary watersheds. <br /> <br />Further Work Plan investigations will include: (1) a flood damage <br />evaluation of frequency and depth of flooding on the flood plain; <br />(2) detailed yield analysis based on the existing guages and new guages <br />on the upstream tributaries; (3) review of the floodwater and irrigation" <br />storage requirements; and (4) reservoir routings of the spillway and <br />freeboard hydrographs for the design of the dam. <br /> <br />( <br /> <br />.n\'\ <br />~t,."'- <br /> <br />9 <br /> <br />