Update On West Virginia Disaster Recovery Floodplain Mapping . - WVFMA
Update on West Virginia Disaster Recovery Floodplain Mapping and the West Virginia Flood Hazard Determination Tool May 14, 2012 Eric Hopkins West Virginia University Tucker Clevenger, PE, CFM AMEC Environment and Infrastructure
Agenda Goals of WV Flood Hazard Development Statewide Update Status AFHs – How are they developed? Quality and Accuracy of Models AFHs – What is their value? AFH Limitations WV Flood Tool Update Future Potential Tool Enhancements User Feedback
WV Flood Hazard Development Goals Improve upon effective approximate floodplains Provide more accurate approximate floodplain boundaries Resolve legacy “DFIRM Conversion” issues 2150 revised effective Zone A miles to date
WSEL 1170ft WSEL 1145ft AFH 1143ft
WV Flood Hazard Development Goals Improve upon effective approximate floodplains Provide more accurate approximate floodplain boundaries Resolve legacy “DFIRM Conversion” issues 2150 revised effective Zone A miles to date Expand coverage of approximate floodplain boundaries All streams down to 2 Square Miles 1340 additional miles of approximate floodplains
WV Flood Hazard Development Goals
WV Flood Hazard Development Goals
WV Flood Hazard Development Goals Improve upon effective approximate floodplains Provide more accurate approximate floodplain boundaries Resolve legacy “DFIRM Conversion” issues 2150 revised effective Zone A miles to date Expand coverage of approximate floodplain boundaries All streams down to 2 Square Miles 1340 additional miles of approximate floodplains Provide enhanced data utility - leverage technology Model backed floodplains with AFH elevations Accessible via the WV Flood Determination Tool Website Improve floodplain management and permitting decisions Support LOMA determinations
WV Flood Hazard Refinement Goals
Statewide Status Update
Statewide Status Update
AFH Floodplain Modeling 2003 WV SAMB 3M DEM topographic data USGS Regression Equation Hydrology HEC-RAS Hydraulic Modeling No hydraulic structures included No channel survey Depth and water-surface elevation grids developed No BFEs on the FIRM
FEMA BFE Development Priority Full Detailed FIS Flood Studies – BENCHMARK Limited Detailed FIS Flood Studies Enhanced Approximates (Model Backed) Quick-2 Single Cross Section Normal Depth Contour Interpolation (Point on Boundary)
FEMA Detailed Studies LiDAR or Aerial Topo Terrain Data (4-foot contours or better) Regression/Gage/HEC-HMS Hydrologic Analyses Steady or Unsteady HEC-RAS modeling Stream channel data incorporated in model Typically field surveyed at 500’ or less interval Structures modeled in detail based on field survey Detailed floodway modeling included Multiple Frequency Analyses Supports BFEs and floodways on FIRM
WV Terrain Data – DEMs
WV Terrain Data - LiDAR
0.4 ft 7 ft 0.9 ft
Comparison of Methods
Limitations of Enhanced Approximate Studies Not accurate immediately upstream of hydraulic structures (bridges/culverts) No channel survey data included in HEC-RAS models Cannot support BFE inclusion on FIRMs Terrain Data Predominantly based on SAMB 3M DEMs LiDAR/Aerial topo only selectively available Field survey data is always paramount
Limitations of Enhanced Approximate Studies
Value of Enhanced Approximate Studies Replace outdated effective Zone A boundaries
Value of Enhanced Approximate Studies Replace outdated effective Zone A boundaries Used as best available data for floodplain management and permitting
Value of Enhanced Approximate Studies Replace outdated effective Zone A boundaries Used as best available data for floodplain management and permitting AFHs can support LOMA determinations BFEs are higher level of quality than FEMA LOMA WSEL determination approaches
Value of Enhanced Approximate Studies Replace outdated effective Zone A boundaries Used as best available data for floodplain management and permitting AFHs can support LOMA determinations BFEs are higher level of quality than FEMA LOMA WSEL determination approaches Cost effective technology to develop high volume of improved floodplains
Value of Enhanced Approximate Studies Replace outdated effective Zone A boundaries Used as best available data for floodplain management and permitting AFHs can support LOMA determinations BFEs are higher level of quality than FEMA LOMA WSEL determination approaches Cost effective technology to develop high volume of improved floodplains Can be updated/enhanced to limited detailed or detailed studies
Value of Enhanced Approximate Studies Replace outdated effective Zone A boundaries Used as best available data for floodplain management and permitting AFHs can support LOMA determinations BFEs are higher level of quality than FEMA LOMA WSEL determination approaches Cost effective technology to develop high volume of improved floodplains Can be updated/enhanced to limited detailed or detailed studies Accessible via the WV Flood Determination Tool – unique to West Virginia
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Future Potential Enhancements Expand towards statewide coverage Improve level of detail of H&H studies Utilize more detailed topo data where available to support flood hazard studies LiDAR or Aerial Topo Data (utilized in Wyoming and McDowell) Flood Profile linkage to detailed study streams Automated LOMA functionality GIS data and HEC-RAS model downloads Flood Data Web Services (Streaming download of data) Enhanced datset availability within tool Hosting more detailed topo data on website Demographic/Population Data Parcel geometry/PID Mobile Application Additional feedback and ideas?
FIS Flood Profile Viewer
Flood Profile Viewer
FIS Flood Profile Viewer
FIS Flood Profile Viewer
Data Download Tool
Data Download Tool
Data Download Tool
User Feedback/Questions? http://MapWV.gov/flood
Disaster Mileage Summary
Update on West Virginia Disaster Recovery Floodplain Mapping and the West Virginia Flood Hazard Determination Tool Tucker Clevenger, PE, CFM AMEC Environment and Infrastructure Eric Hopkins West Virginia University May 14, 2012
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Keywords: Disaster knowledge; Disaster risk; Disaster risk reduction; Nepal Background Disaster risk is expressed in terms of potential loss of lives, deterioration of health status and livelihoods, and potential damage to assets and services due to impact of existing natural hazard. Disaster risk reduction (DRR) is a systematic approach to .
There are also four possible examples of themes which could be followed. Each has a set of readings with an introduction to them. This could either act as a prompt to whoever is preaching, or could be read when there is no preacher present, as sometimes happens in our rural groups of churches where each church holds its own service. There is a linked prayer and suggestions for the music .
