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Published byBranden Shanes Modified over 10 years ago
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Flood Map Modernization in North Dakota North Dakota State Water Commission FLOOD MAP MODERNIZATION
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Flood Map Modernization Nationwide, 5-year, $1 billion program to update FEMA’s Flood Insurance Rate Maps (FIRMs) and convert them to a countywide, digital format (DFIRM) that will be available through the internet Existing paper FIRMs may no longer reflect current flood risks (due to changes in drainage patterns resulting from erosion, land use practices, development, etc.) Goal: digital flood map products will be available for 92% of the Nation’s population and will cover 65% of the land area of the continental US Integrate local participation into the mapping process NDSWC - “Cooperating Technical Partner” since 2004
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Flood Map Modernization New maps will allow for better decision-making by key stakeholders Builders and developers Community officials and planners Real estate agents and lenders Insurance agents Business owners Homeowners and renters
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COMPONENTS OF A DFIRM
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Flood Map Modernization Lifecycle of a DFIRM Project 24-36 months Source: FEMA
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Flood Map Modernization Mapping Process & Timeline
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Flood Map Modernization Local Needs Identified Existing Data FIRM panels, FIS LOMC Existing data studies Levee information Base Map: orthophotos, elevations, roads & railroads, hydrography, political boundaries, etc. Does technical information meet FEMA Data Standards? Local Mapping Needs Areas for restudy Problem areas Unmapped areas where development is occurring
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Flood Map Modernization Mapping Process & Timeline
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Production Methods Digitization Redelineation Approximate Analysis Detailed Analysis
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Flood Map Modernization Data Development Digitization If available, use existing workmap instead of FIRM Existing floodplain boundary is lifted from existing map Clean up spots where paper map does not match base map
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Flood Map Modernization Data Development Redelineation Digitize cross sections Extract elevations of flood using effective profile No change in flood elevation, but better flood delineation Redelineation accuracy dependent on accuracy of available topo
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Flood Map Modernization Data Development
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Flood Map Modernization Data Development Detailed Analysis Channel geometry surveyed BFEs printed on the map Floodway defined Most expensive
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Flood Map Modernization Mapping Process & Timeline
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Flood Map Modernization Local Participation - Today Identify Mapping Needs Areas for re-study Problem areas Unmapped high development areas Existing Data Studies (Corps, NRCS, etc.) Leverage (Goal: 80% Federal, 20% Local) Digital Data Funds Levees
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Flood Map Modernization Local Participation - Future Review preliminary products Collect and submit Appeals/Protests Final map adoption
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Flood Map Modernization Community Adoption Process Preliminary maps distributed, 30-day comment period begins Public “Community Coordination” meeting held BFE changes published in Federal Register 90-day appeal period begins, submitted to and resolved by FEMA FEMA issues “Letter of Final Determination” FIS and Map submitted for printing Map/FIS become effective 6 months from LFD issuance Community is given 6 months from effective date to enact the required ordinances or may be suspended from the NFIP
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Countywide Map Modernization Projects NDSWC & FEMA
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Thanks for your participation! For more information, please visit these sites: general info http://www.fema.govhttp://www.fema.gov NFIP http://www.floodsmart.govhttp://www.floodsmart.gov map mod http://www.fema.gov/plan/prevent/fhmhttp://www.fema.gov/plan/prevent/fhm map service center http://msc.fema.govhttp://msc.fema.gov datums http://www.ngs.noaa.govhttp://www.ngs.noaa.gov
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