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<br />The uses of the water from Ryan Gulch Reservoir will not change as a result ofthis project. This <br />project will not increase the Company's irrigation water supply. Historically, the reservoir is filled <br />once a year and used throughout the irrigation season. <br /> <br />D. Project Lands <br />Ryan Gulch Reservoir will not change as a result of this project. This project will not <br />broaden the Company service area and will not provide for irrigation of any new lands. <br /> <br />E. Hydrology and Water Rights <br />E.1 Flood Hydrology <br />The flood hydrology was developed in the hydrologic assessment of the dam [Toms, 1998]. <br />The hydrologic analysis was performed in accordance with the SEO guidelines [SEO, 1994]. The <br />hydrologic assessment is being reviewed by the SEO. The flood hydrographs from the local PMP, <br />general PMP and 100-year events were developed using Bureau ofRec1amation (USBR) methods <br />outlined in their Flood Hydrology Manual [USBR, 1989]. The flood hydrographs were used to <br />determine hydrologic effects on South Side Dam, Ryan Gulch Dam and downstream structures. <br /> <br />Lonetree basin is the contributing area to Lonetree Dam with an area of5.95 mi'. South Side <br />basin is the contributing area into South Side Dam with an area of 4.62 mi'. Ryan Gulch basin is <br />the contributing area into Ryan Gulch Dam with an area of 1.79 mi'. The total study watershed has <br />an area of 12.36 mi'. Southside Reservoir is located directly upstream of Ryan Gulch Reservoir. <br />14th Street is located downstream of Ryan Gulch Dam. Taft Avenue is located downstream of 14th <br />Street. <br /> <br />Table III-I lists the results for the 100-year inflow design flood (IDF), which was used as the <br />basis for the spillway design. <br /> <br />C\WORKIPROJECTS\RYAN'J'EASREPORT\RYANRPT DOC <br /> <br />6 <br /> <br />]anuary 12. 1999 <br />