Multi-Hazard Mitigation Plan: 19. Mitigation Strategy

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Chapter 19:Mitigation Stratq, HAWAII COUNTY PROJECT/PROPOSAL SUMMARY LISTING PRIORITIZATION RESULTS INDICATED)OCTOBER 12,2009 PAGE 1 Mitigation Actions for Tsunamis Project Description Status Update tsunami evacuation maps: The 2-D model is based on good topographic data along Ongoing project: Any necessary Tsunami Inundation and Runup Mapping: Analysis of the the coastline(e.g.,LIDAR). "Maximum credible evacuation zone changes would be island of Hawaii based on scenarios from tsunami-genic inundation"used to develop evacuation maps done by Quince Mento of HCDA based source regions along the Pacific Rim. Big Island mapping on updated information from UH focuses on 13 populated areas around the island. SOEST Need to note significant discrepancy with new FIRM maps. It The present maps have historical tsunami inundation Proposed Planning Project: There will was originally thought that the 2-D modeled tsunami embedded,but the new DFIRMS do not. FEMA is need to be post-DFIRM modifications to inundation maps would be incorporated into the FIRM maps addressing this issue in 2010 with a payload study to the Flood Maps if tsunami inundation is as the VE zone. However,FEMA is using a standard 1-D compare the differences between the existing and new to be any factor in zoning and model nationwide and would not allow exceptions. DFIRM maps,and to produce maps using the greater construction requirements. effect along the south and west coasts. Phase I: The first step is to compare the differences between the existing and new FIRM maps to determine where historic or the recently modeled tsunami hazard is greater. Phase II: UHM SOEST mapping(by Kwok Fai Cheung)can produce 100- year and 500-year probabilisitic tsunami hazard maps to provide future local modifications to the DFIRMs. Tsunami design guidelines for buildings Update of the design provisions for tsunami bore impact Under development by University of Sept 2010 guidelines for new and for evaluating existing and inundation/scouring Hawaii at Manoa,Princeton,OSU,and buildings. Martin&Chock;for future adoption Go to Page 1 Go to Page 2 Note.-Italics indicates project called for in the 2005 County ofHawaii Multi-Hazard Mitigation Plan 19-27 Hawaii County Hulti-Hazard Mitigatimr Plan