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 Page 19 Upper and Lower Emerald Valley Dam Failure Report <br /> January 23, 2015 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />8.0 Model Results <br />Two models were run for this study (Figures 23 to 27): <br /> <br />(1) The model run assuming no dams breached during the rainfall. This provides the basis of <br />the flows, timing of the peak discharges from each contributing basin and provides a sense of <br />potential impacts to existing structures and facilities downstream assuming no dams existed. <br /> <br />(2) HEC-HMS was configured with the overtopping breach parameters previously described, <br />and the model set to breach the dams at the trigger (dam failure) times established. The <br />Figure 21: Field Survey of High water mark at Keeton Reservoir, Depicting estimated <br />max 2.48 feet flow through Spillway control section <br />Figure 22: Keeton Reservoir Spillway Discharge Rating Curve. Q = 129.5 * H^1.70. <br />Extracted from 2007 WW Wheeler Design/Construction of New Spillway.