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85 <br /> <br />In addition to the scenario inundation maps, CalOES developed tsunami evacuation <br />maps indicating areas that should evacuate if a warning is given. The CalOES tsunami <br />maps are not associated with a particular event but instead represent the worst-case <br />scenario at any given location by combining a suite of extreme, but plausible, <br />inundation scenarios. Additionally, the maps include no information about the <br />probability of a tsunami affecting an area at any given time. Because of this, it is not <br />intended to show locations of probable inundation but should be used for evacuation <br />planning only. In general, the CalOES tsunami evacuation map is more conservative <br />than the USGS SAFRR study; however, there are a few locations where the SAFRR <br />study shows greater inundation. <br /> <br />PAST OCCURANCE AND POTENTIAL FOR OCCURANCE: <br />The likelihood of a major tsunami created near Alaska or Japan causing flooding of <br />the San Leandro bayfront is very remote since a wave 20 feet in height at the Golden <br />Gate would be necessary to reach the northern most point of San Leandro bayfront <br />with a minimum run-up of five feet at higher high tide. The highest tsunami affecting <br />the area during the last 120 years had a height of 7.4 feet at the Golden Gate, causing <br />a two-foot run-up along the San Leandro shoreline.21 For San Leandro, the tsunami <br />maps prepared by CalOES in Figure 5-13 indicate that only the areas outside of the <br />City’s levee system are at risk for tsunamis, including the adjacent marshlands, tidal <br />flats and former bay margin lands that are now artificially filled but are still at or <br />below sea level. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />20 Ibid <br />21Ibid. <br />22 Placer County Local Hazard Mitigation Plan Update (December 2015). p. 4-119. http://www.placer.ca.gov/departments/ceo/emergency/local-hazard-mitigation-plan <br /> <br /> <br />124