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Lessons Learned: Risk MAP Early Demonstration Project Madison County, AL . TN AFPM 2011 Montgomery Bell State Park July 28, 2011 Eric Zgonina , EIT AMEC . Map Modernization & Risk MAP Overview Risk MAP Early Demonstration Purpose Study Area Selection/Proposal
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TN AFPM 2011
Montgomery Bell State Park
July 28, 2011
Eric Zgonina, EIT
Risk MAP Development
Project study area funded prior to 2010, pre-appeal phase
Strong Regional Support
Efforts could not exceed $100k
Good elevation data
Completion by February 2011, lessons learned integrated prior to FY2011 Risk MAP
Madison County Project
Strong stakeholder relationship, OWR and AMEC
Current ground surface data:LiDAR 2007
Area which will benefit from products, mitigation potential
Existing county revision, several detailed studies
CSLF example: Bradford Creek, Madison, AL
Flood Control Structures
Initial Raster Mosaicing
Using AFG Floodplain
Using Geo-RAS Floodplain
Velocity grid example: confluence of Indian Creek Trib 1 and Indian Creek, Intersection of Slaughter Road and Interstate 565 Huntsville, AL, 100 yr event
30 -Year Percent Chance
1 - (1 - p)30
Procedure derived based on FEMA guidance
ESRI model builder tool created
Grids were created for each of the selected flooding source intervals and mosaiced by county
Aldridge Creek, near Valley Hill Country Club area, Huntsville, AL
High density in floodplain, LOW RISK?
FEMA provided a Level 1 HAZUS risk assessment for each census block.
Results were poor in quality.
Classified all census blocks as residential in Madison County.
Community stakeholders noted areas of high risk labeled as very low risk in HAZUS.
Enhanced flood risk assessment not possible with current version of HAZUS, needs to be revised.
Flood Depth Analysis Grids
Flood Risk Assessment
Guidance details MR4 version cannot calculate annualized loss but does include a HAZUS alternative loss calculation formula.
Guidance does not address partial dataset information entered into the Comprehensive Data Management System (CDMS) but defers users to CDMS manual.
MR5 available and new version of CDMS should be available soon
Remains point feature
Defines how to create AOMI Data including detailing the data mining process
Guidelines are not mandatory and some portions may be tailored by writer
Template Tables may be edited based on available information
Template text edited
Purpose of FRM is intended for facilitation purposes to involve communities
Legend modified- specifies AOMIs
Most recommendations followed
Develop a framework that collects information on the effectiveness of partnerships
Ensure Risk MAP products from partnerships are complementary and not duplicative
Collaborate with partners to improve understanding and encourage action
Provide support to partners to include policies, procedures, guidelines, and training