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I I I I I I I I I I ,I I I I I I I I I .'\ ........ ~ Bootleg Reservoir Dam October 21, 1982 Page 4 Conclusions Bootleg Reservoir Dam and associated structures appear to be in essentially the same condition as has been noted on previous inspections. The structure has not been maintained and is in a somewhat deteriorated con- dition. HO\vever, its condition appears to be satisfactory for the purpose it is used, flood water retention for a short period of time. The outlet gates are operated in a half open position to allow the controlled release of excessive flows from the reservoir basin. Although portions of the structure are somewhat deteriorated, they appear to be serviceable for the period of time which water may be impounded during a flood event. On September 14, 1982, the reservoir basin was filled to nearly spillway ele- vation in four hours. Water was released at a maximum discharge of approxi- mately 350 cfs, taking approximately 3.5 days to drain the reservoir. Recommendations The owners should be asked to implemel1t the following recommendations, as a minimum, to improve the condition of this dam. 1. Trees and brush growing and developing on the upstream slope should be killed and removed. Any future growth should be removed as part of the O\Vller I s annual maintenance program. 2. A formal rodent control program should be initiated to control rodellt activity in the vicinity of the dam and to prevent or minimize future rodent damage. 3. It is l'econunended that a uniform crest elevation be established across the length ox the man-made embankment. This would maximize spillway capacities and will prevent concentrated overtopping through existing 100v areas during a severe storm. Should a severe storm result in over- topping, a uniform crest elevation will assure uniform overtopping with minimal depth and velocity, with greater chance that overtopping will not lead to failure. 4. The owners should employ an engineer to survey the exist~ng spillways and determine the depth-capacity curve for each overflO\v ar.ea. With this information, the magnitude of flood this structure will accommo- date, a) without diverting water into the adjacent drainage channel, or b) without overtopping the dam should be determined. The O\mers should also determine their direct liability for damage Ivhich might be suffered by property 'on . the adjacent stream channel should this dam force water to spill through the low area in the south- Ivest corner of the reservoir basin into the adjacent drainage channel. After determination of the above facts, the owners may want to take act ion to reduce, eliminate, or insure against thi s liabi li ty . The Henrylyn Irrigation District and their engineers should inform our office of their findings and intentions. .5. A cover should be placed over the top of the wet well to prevent members of the general public from accidentally falling into the wet well. 6. The l1enrylyn Irrigation District. should continue to maintain the outlet gates, and should cycle the gates through their full operating' range .at least once and prcfcra~ly twice each year.