Multi-Hazard Mitigation Plan: 10. Floods

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Chapter 10:Hazard Analysis—Floods 10.4.2 Future Plans Project Description Status Modernize FIRM maps with local amendments See http://k�is.hawaiinfip.org,/that On Dec. 12,2008 and Feb.26,2009,FEMA FEMA has revised the DFIRM's and Flood Also included a re-evaluation of issued Preliminary Digital Flood Insurance Insurance Study based on hurricane flooding the Puukapu Watershed of the Rate Maps(91 panels)for Hawaii County hazard. Waimea area (Pre-DIRMs).On April 21,2009,FEMA These FIS maps do not include historic tsunami held its Pre-DIRMs flood hazard mapping inundation data. The next step is to compare the community coordination meeting with the differences between the existing and new FIRM County.On April 22,in Kona,and April 23, maps to determine where historic or the recently in Hilo,FEMA and the County held public modeled tsunami inundation hazard is greater. meetings on the Pre-DIRMs. On June 30,2009,the County sent a letter to FEMA indicating,until the Pre-DFTRMs are revised to acceptable standards,the County will continue using the County's current floodplain management records to make land use and building permit issuance decisions. On July 7,2009,FEMA acknowledge the County's June 30 letter and accepted the County's support in preparing improved digital presentations of the riverine flood zones.On Sept.28,2009,FEMA approved a $71,300 Cooperative Technical Partners grant to assist in improving the riverine flood zones on the DFIRMs.FEMA will continue to improve the DFIRMs coastal high hazard areas by combining the more protective inundation areas from either FEMA's 2008 hurricane flood study for the County of Hawaii(refer to Section 10.4.1.3)and the current effective FIRMS'coastal high hazard areas. Participate in the Community Rating System Results in reduction in flood Project requires documentation effort and insurance premiums analysis of repetitive loss properties Precipitation-Frequency Atlas of the US Hawaiian http://hdsc.new.noas.gov/hdsc/pfds NOAA release May 2009 Islands Includes:precipitation frequency estimates for durations from 5-minutes through 60 days,for return periods of 1-year through 1000 years. Develop policies for repetitive loss structures Policy may or may not make This depends on an analysis of repetitive loss economic sense from a Benefit properties Cost Analysis Area Development Plan for Existing and Future Floodplain management and land Ongoing project scope: Recommend Development use regulatory integration scope of revisions to the Department of Public Works This project proposes to refine regulations and work includes examining for Chapters 10 and 27;and recommend policies for new development and provide regulatory integration of grading revisions to the Planning Department for community outreach in regards to ordinance(HCC chap 10),flood Chapters 23 and 25 and develop new protection/precaution measures. Context Sensitive control code(chap 27), regulatory measures to reduce flood hazards Solutions methodology will be used to identify a subdivision code(chap 23),and within the County of Hawaii and to earn comprehensive programmatic approach to mitigate zoning code(chap 25) FEMA Community Rating System(CRS) the risks to existing and future developments. The points for the County of Hawai'i. study also proposes to identify and prioritize floodplain mapping,develop policies for unprotected subdivisions,and coordinate disaster preparedness planning for floods. Develop rainfall and streamflow gauging system Internet accessible tool to view NOAA PSC developing prototype suitable to flood monitoring real-time rainfall and streamflow application for emergency managers data 10-37 Hawaii County Multi-Hazard Mitigation Plan