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I I I I I I I I I I I I I I I I I I I Storm Event Peak Di scharge cfs Runoff Volume (acre-feet) 24-hour General PMF 24-hour 1/2 General PMF 6-hour Local PMF 6-hour 1/2 Local PMF 24-hour 100-year 15,927 7,964 8,172 4,086 1,477 7,272 3,636 2,480 1,240 680 The exi sting dam and emergency spillway can currently pass the 100-year storm event without overtopping the dam. The maximum capacity of the emergency spillway is about 20 percent of the Probable Maximum Flood without overtopping the dam. The State Engineer is in the process of updating their design criteria for dam safety. Based on discussions with the State Engineer and the current classifica- tion of the dam, it was felt that the emergency spillway for the Victor No.2 Dam should be designed to pass, as a minimum, 1/2 of the Probable Maximum Flood (7,964 cfs) without overtopping the dam. Several improvement alternatives for the dam were evaluated based on this inflow design flood. Improvement alternatives considered several di fferent aspects including: embankment stabil ity, construction materials, construction methods, and costs. RecolIIIII!ndation After careful consideration, one alternative was chosen as the most feasible and economic solution to rehabilitating the Victor No.2 Dam and to provide the water storage which was lost due to the lowering of the emergency spillway crest. The recommended plan of improvements addresses the following design concerns: 1) Raises the emergency spillway crest to its previous elevation to enable the city to store it's allocated water (203 acre-feet). 2) Increases the stability of the dam to meet current State Engineer design criteria. 2