Northwest Florida Water Management District Monday, August 22, 2011

Flood RisK Products Review Risk MAP Mapping – Flood hazard and risk identification Assessment – HAZUS and other risk assessment tools Planning – Hazard mitigation planning Risk MAP Vision Deliver quality data Increase public awareness of flood risk Encourage local/regional actions that reduce risk

Products Review (cont.) Through Risk MAP, NWFWMD and FEMA work with communities to develop flood risk products and flood hazard maps that are: Based on the best available data from the community and latest technologies Conducted by watershed Strengthened by partnerships Risk MAP tools and data may be used to: Create or improve Hazard Mitigation Plans Make informed decisions about development, ordinances, and flood mitigation projects Communicate with citizens about flood risk

Product Comparisons 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 DFIRM Database Traditional Regulatory Products Non-Regulatory Products

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

Changes Since Last Map Goals: Help communities understand changes to their flood maps Identify sources and areas of SFHA Increase/Decrease & Zone Changes Produce a spatial layer that can be used to quickly identify building/structures that are at risk but were previously unidentified Additional Value: DFIRM QC tool Identification of areas subject to appeal periods

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Multi-Frequency Depth Grids Goals: Help communities better understand their likelihood of flooding beyond just the “1 percent annual chance” floodplain Produce data that can feed into HAZUS Provide location-specific results within the floodplain that communities can leverage for additional analysis Provide information that can feed into Benefit-Cost AnalysesWSEL Depth

Flood Depth Grids Depth Grid Calculated as Difference between WSE and Ground XS XS Depth

Multi-Frequency Depth Grids AerialImagery Point A Point B

Multi-Frequency Depth Grids 10% Depth 1.8 ft 0.0 ft

Multi-Frequency Depth Grids 4% Depth 3.5 ft 0.4 ft

Multi-Frequency Depth Grids 2% Depth 4.4 ft 1.4 ft

Multi-Frequency Depth Grids 1% Depth 5.4 ft 2.3 ft

Multi-Frequency Depth Grids 0.2% Depth 9.7 ft 6.6 ft

LiDAR

Risk MAP Products Updated HAZUS (Average Annualized Loss Study and updates) analysis using modern DFIRM data bases and LiDAR enables communities to accurately understand risk