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<br />I, <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Henrylyn Irrigaton District <br />May 19, 1983 <br /> <br />Page 2 <br /> <br />You should employ an engineer to survey the existing spillways and <br />determine a depth-capacity curve for each overflow area. The magni- <br />tude of flood this structure will accommodate a) without diverting <br />flood flows into ~he adjacent drainage channel or b) without <br />overtopping the dam should be determined. <br /> <br />After determining the magnitude of flood which could be accommodated <br />without diversion of flows outside the Boxelder Drainage and your <br />liability if flood flows are diverted, you may wish to take action to <br />reduce or eliminate possible liability. After deciding on your <br />course of action, please inform this office of your findings unc] <br />intentions. <br /> <br />Because of the general condition of this structure, it is unsafe for <br />long-term storage of water. The reservoir is hereby restricted to zero stor- <br />age. The outlet must remain opened to a position that will release water at <br />the maximum rate that can be accommodated through your canal and overflow <br />system. Storage in the reservoir because of insufficient outlet capacity <br />cluring flooding conditions must he evacuated within seven (7) days. Please <br />notify this office when a) storage in the reservoir exceeds gage height 10.0 <br />feet for five (5) consecutive days or b) it is foreseen that the reservoir <br />can not be evacuated within the seven (7) day period. An inspection of this <br />dam by our office will then be scheduled. <br /> <br />This restriction is the minimum action your company can take to improve <br />the safety of the dam. Additional actions may be necessary based upon the <br />recommendation of your engineer.. You are reminded that as owner, you are <br />liable for the safety of this structure and that these minimum requirements do <br />not relieve you of that liability. <br /> <br />Pleas~ submit a schedule for the completion of this requested.work to our <br />office by July 15, 1983. <br /> <br />Members of this office will be available to discuss the required engi- <br />neering work with you or your representatives. If you have any questions, <br />please contact Eric Wilkinson of the Dam Safety Branch of this office <br />(866-3581 - Office; 221-3066 - Home). <br /> <br /> <br />Q .,;&~ <br /> <br />A. Danielson <br />Engineer <br /> <br />JAD/EWW:pkr <br /> <br />Enclosure <br /> <br />cc: James R. Clark, -Div. Bng. (w/report) <br /> <br />Robert D. Samples, Water Comm. (w/report) <br />r-lr. Mack Adams, P.E., (w/enclosure) <br />