Multi-Hazard Mitigation Plan: 19. Mitigation Strategy

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Chapter 19:Mitigation Stratq, HAWAII COUNTY PROJECT/PROPOSAL SUMMARY LISTING OCTOBER 12,2009 Mitigation Actions for Flooding Description Status Modernize FIRM maps with local amendments See http:gis.hawaiinfip.org/fhat Existing maps include historic tsunami FEMA has revised the DFIRM's and Flood Insurance Also included a re-evaluation of the inundation,but the new hurricane flood Study based on hurricane flooding hazard. Puukapu Watershed of the Waimea area study maps do not account for this These FIS maps do not include historic tsunami hazard. FEMA is addressing this issue in inundation data. The next step is to compare the 2010 with a payload study to compare the Project differences between the existing and new FIRM maps to differences between the existing and new determine where historic or the recently modeled tsunami DFIRM maps,and to produce maps using inundation hazard is greater. the greater effect along the south and west coasts. Area Development Plan for Existing and Future Floodplain management and land use Ongoing project scope: Recommend Development regulatory integration scope of work revisions to the Department of Public This project proposes to refine regulations and policies for includes examining regulatory integration Works for Chapters 10 and 27;and new development and provide community outreach in of grading ordinance(HCC chap 10), recommend revisions to the Planning regards to protection/precaution measures. Context flood control code(chap 27),subdivision Department for Chapters 23 and 25 and Sensitive Solutions methodology will be used to identify a code(chap 23),and zoning code(chap develop new regulatory measures to comprehensive programmatic approach to mitigate the 25) reduce flood hazards within the County of risks to existing and future developments. The study also Hawaii and to earn FEMA Community proposes to identify and prioritize floodplain mapping, Rating System(CRS)points for the develop policies for unprotected subdivisions,and County of Hawai'i. coordinate disaster preparedness planning for floods. Develop rainfall and streamflow gaging system suitable to Internet accessible tool to view real-time NOAA PSC developing prototype flood monitoring rainfall and streamflow data application for emergency managers Precipitation-Frequency Atlas of the US Hawaiian Islands http://hdsc.new.noas.gov/hdsc/pfds NOAA release May 2009 Inlcudes:precipitation frequency estimates for durations from 5-minutes through 60 days,for return periods of 1- year through 1000 years. Feasibility of participating in the Community Rating Results in reduction in flood insurance Project requires documentation effort and System premiums analysis of repetitive loss properties Go to Pane 1 Go to Pane 2 Note.'Italics indicates project called for in the 2005. County gfHawaii Multi-Hazard Mitigation Plan 19-28 Hawaii Cnurny Multi-Hazard Mitigation Plan