Floodplain Mapping Status in Wisconsin
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Transcript of Floodplain Mapping Status in Wisconsin
Floodplain Mapping Status in WisconsinAmanda Schwoegler
Floodplain Mapping Project Coordinator, WDNRWLIA - 2/17/2011
2007 • 14 Counties affected• 4600 households have applied for assistance• $13 million + funds distributed
2008• 31 counties declared• $763,618,860 + in damages• Over 40,000 applied for Individual Assistance with over $55 million disbursed• Nearly 2,000 SBA low-interest disaster loans for over $46 million
Some Statistics From Recent Events
2003 – 2008Map Modernization
Program
• Multi-year FEMA program to update the nation’s flood insurance rate maps (FIRMs) to as digital, countywide format.
2009Transition Year
• Funding year between FEMA multi-year programs
• Funding provided for the main stem of the Rock River to the Illinois border.
2010 - ?Risk MAP
Mapping, Assessment and Planning
• New multi-year FEMA program using a watershed approach
• Funding provided for Upper and Lower Rock River watershed studies
From Map Mod to Risk MAP
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Countywide Watershed
Geographic Approach
Program Goals and Measures
Transfer Risk
Reduce Risk
MapRisk Data
Risk MAPREDUCE LOSS OF LIFE & PROPERTY
Goal – Measure Quantifiable Risk Reduction
AssessPresent & FutureRisks
Plan for Risk
22AssessAssessRiskRisk
33CommunicateCommunicateRiskRisk44MitigateMitigate
RiskRisk
11Identify Identify RiskRisk
Risk MAP LifecycleFocus on Better Risk Communication
Traditional products are regulatory and subject to statutory due-process requirements
Risk MAP products are non-regulatory and are not subject to statutory due-process requirements
Traditional Regulatory ProductsTraditional Regulatory Products Non-Regulatory ProductsNon-Regulatory Products
Risk MAP Program Product Comparisons
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Data Fields Include Example Data Values
Old Study Date e.g. 1985
Old Model Type(s) e.g. HEC-1 / HEC-2
Old Zone Type e.g. Zone A
Old Topography e.g. USGS 10-ft
New Study Info/Methods
Dates, Models, etc.
New Study Zone e.g. Zone AE
New Topography e.g. LiDAR 2-ft
New Study Engineering Factors / Changes
e.g. new structures, gages, topo, landuse, etc.
Estimated Structures e.g. 9
Estimated Population e.g. 27Enhanced
Flood Risk Database (red = enhanced)
Changes Since Last FIRM•Horizontal Changes and Results
•Structure/Population counts impacted by change
Depth & Analysis Grids•Depth (10, 04, 02, 01, 0.2 percent chance)
•Percent Annual Chance
•Percent 30-Year Grid
•Delivery of Water Surface Elevation (multi-freq)
•Water Surface Elevation Change Grid (1%)
•Velocity Grids, Annualized Depth, Top and Toe of Levee
•Multi Freq Grids for Levee and Coastal Areas, etc.
Flood Risk Assessment•Average Annualized Loss – 2010
•Refined Flood Risk Assessment
•HAZUS or Non-HAZUS with improved data/assumptions
Areas of Mitigation Interest•Areas of Mitigation Opportunity or Awareness
Flood Risk ReportContent Overview
• Background:– Purpose, Methods– Risk Reduction Practices
• Project Results:– Changes Since Last FIRM– Depth & Analysis Grids– Flood Risk Assessment– (enhanced analyses)
• e.g. Areas of Mitigation Interest
• Summarized by Locations:– Communities and Watersheds
Visually Promotes Risk Awareness• Contains results of Risk
MAP project non-regulatory datasets
• Promotes additional flood risk data not shown but located within the Flood Risk Database
WHERE ARE WE NOW?
Nationwide
KPI 1: 92% of Nation’s Population with Digital GIS Flood Data
KPI 2: 87% of Population with Adopted Maps that Meet Quality Standards by end of FFY11.
Wisconsin
50 counties will have Digital GIS Flood Data by end of 2011
11 counties will have Digital GIS Flood Data by end of 2013
New studies throughout the Upper and Lower Rock Watersheds
Rock River Watersheds
~300 miles of New Detailed Study
~300 miles of New Approximate Study
Lower Wisconsin
- Black Earth Creek
Chippewa/Eau Claire
-Some new studies
Mellen (Ashland Co.) 1946
Darlington (Lafayette Co.) 1990
Gays Mills (Crawford Co.) 2007
QUESTIONS???