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<br /> <br />From studies of several other reservoirs it is estimated that approximately <br /> <br /> <br />90% of the sediment load will be deposited in the proposed White River Reservoir. <br /> <br /> <br />The reservoir, by design, will have the capacity to hold a large volume of <br /> <br /> <br />deposited sediments. This aspect will have a tendency to improve the downstream <br /> <br /> <br />fishery and will definitely decrease problems associated with pumping and <br /> <br /> <br />utilization of irrigation water on the Ute Tribal agricultural lands. <br /> <br />Upstream water conservation projects will further reduce the amount of <br /> <br />sediment at the proposed reservoir. With the available sediment data for the 1975 <br /> <br /> <br />and 1976 water years indicating a sediment load of approximately 735 acre-feet <br /> <br /> <br />per year and a reservoir trap efficiency of 90 percent, the estimated trapped <br /> <br /> <br />sediment load will be 660 acre-feet per year. The proposed reservoir has a sediment <br /> <br /> <br />storage space of 38,000 acre-feet; therefore it should be 58 years before any <br /> <br /> <br />encroachment occurs on the active reservoir storage, assuming all the sediment <br /> <br /> <br />storage will be deposited in the inactive zone. <br /> <br />H. Dam Safety Provisions <br /> <br />Utah State Dam Safety provisions will be complied with including: <br /> <br />1. Plans on tracing cloth for construction of the dam will be filed with <br />the State Engineer's office with prescribed title block information. <br /> <br />2. Final plans will be filed with the State Engineer's office with all <br />details necessary for analysis of the hydraulic characteristics, capacity of outlet <br />and spillway, spillway design, grout curtain and cap, stability, and seismic design <br />provisions. All details necessary for construction will be shown including: <br />a complete topographic and geologic survey of the reservoir area, a general map, <br />tie to an official land survey corner, hydrologic data, drainage area and flood <br />routing criterion, subsurface exploration data, typical cross-section of dam, <br />profile of spillway, profile along axis of dam, crest width of dam, details of <br />cutoff, core trench, freeboard, cross-section of outlet works, plan view of dam, <br />derivation of capacities of outlet works and spillway, area capacity curve <br />and/or table. <br /> <br />and <br /> <br />3. Final specifications <br />inspectors with regard to: <br /> <br />adequate to guide the field engineer, contracts <br />site preparation, grouting, borrow areas, <br /> <br />embankment, and concrete. <br /> <br />- 42 - <br />