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<br />Chapter III - Background Information <br /> <br />A. Previous Studies <br /> <br />At least two previous engineering re~orts have been completed for this structure. <br /> <br />1. South Side Dam Hydrologic Assessment, by Mr. Ed A. Toms, P.E., <br />March 9, 2002, is referred to in this feasibility study. This <br />hydrologic study has been approved by the State Engineer's Office. <br />The essence of this study is that the spillway must pass the 100- <br />year inflow flood safely. The study indicated that the spillway <br />lacked approximately 0.4 feet of required freeboard to allow the <br />spillway to function properly during the 1 DO-year flood event. This <br />issue must be addressed to assure the safety of the Dam and to <br />allow the SEO to consider lifting the restriction on the storage <br />capacity of the reservoir. <br />2. Outlet Pipe Logging South Side Reservoir by Davenport/Hadley, <br />Ltd., Apri/19, 1984, describes horizontal borehole logging of the <br />existing outlet works. This report is a <br /> <br />B. Project History <br /> <br />South Side Reservoir (AKA Bud Mielke Reservoir) was originally constructed in 1904 <br />along with a downstream reservoir called Ryan Reservoir. On July 7, 1978, the <br />State Engineer's Office (SEO) restricted the water level in the reservoir to 8-foot <br />below the crest of the dam. The restriction was based on SEO hydrologic <br />calculations that indicated spillway capacity was inadequate. The reservoir storage <br />capacity, when full, holds 654 acre-feet of water at gage height 25.5 feet. The <br />restriction at gage height 22.5 feet allows for storage of 448 acre-feet. The storage <br />restriction represents a loss of 206 acre-feet. The Company wants to rehabilitate the <br />dam so that the storage restriction can be removed and the lost storage can be <br />restored. <br /> <br />14 <br />