Nws floodplain inundation project

Texas Floodplain Management Association 2011 Fall Conference September 22, 2011Collaborations to Develop and Deploy Flood Inundation Maps David R. Maltby II USGS TX WSC Gregory P. Shelton NWS West Gulf RFC

What is Flood Inundation Mapping?Flood Inundation Mapping (FIM) is a real-time, operational tool that visually relates USGS streamgage readings and NWS forecasts to flood risk for the primary purpose of public safety, but also has significant benefits of: • Understanding changing natural processes that produce hazards • Development of hazard mitigation strategies and technologies • Effectively reduce vulnerability and repetition of loss to infrastructure • Promotion of risk-wise behavior

Overview• Review of NWS Flood Inundation Mapping Program – Current locations and planned future work• Review of USGS Flood Inundation Mapping Initiative (FIMI) – Current and future work• Review of Collaborative Projects between NWS and USGS – Incorporation of maps into HAZUS 3

Status and GoalsNWS FLOOD INUNDATIONMAPPING PROGRAM

Status of AHPSFlood Inundation Mapping Services http://water.weather.gov  62 AHPS Flood Inundation Map Libraries  Federal Guidelines Version 3 (Commonality Across Agencies)  QA/QC Plan and Training 5

Direction of AHPSFlood Inundation Mapping Services NWS Stakeholder Surveys • Public wants Common Tools and Features such as Google • Emergency Managers need Enhanced Decision Support Tools to support Weather Ready goals • According to recent NWS CFI customer survey, responses increased by 250%. • The number of respondents who claimed to be a personal user increased from 8 to 21 thousand or roughly 64% of all respondents. • The number of respondents for Emergency Response remained consistent. 6

Direction of AHPS Flood Inundation Mapping Services Meeting Stakeholder Needs • Same Information Across Multiple Platforms (Collaborations with Multiple Federal Agencies) Human • Common Tools and FeaturesDimension • Underlying Fundamental Science • Supported By Subject Matter ExpertsOperational Science Technical 7

Direction of AHPSFlood Inundation Mapping Services Meeting Stakeholder Power User Needs Better Visualization Enhanced Communication of Flood Risk and Likelihood for Flooding Flood Loss Potentials Concept from NWS Aptima Report, which surveyed EM, reservoir operator, and user.

Status and GoalsUSGS FLOOD INUNDATIONMAPPING INITIATIVE

Flood Library Tools

Static Inundation Map Libraries

FIMI Web Mapping Application “New” Features• Decision Matrix – ability to show two linked dependent sites for one reach• WaterAlert – Subscribe in the application• WaterWatch – Set the historical context for current flows using another USGS product• NWS forecast linkage – Working on which forecasts and how to display• SharePoint form for submission of libraries from USGS WSCs

Next Steps in Products and Communications• Toolbox and Map libraries – Continue to elaborate on the guidance and templates as needs arise through the pilot projects and cooperator/partner needs – Add NWS Inundation Libraries and more links to AHPS• Continue WMA development – Integrate more seamlessly with NWS forecasts • Combined live hydrograph and APTIS uncertainty communication ideas – Integrate with more NWS tools and web services – Work on including HAZUS information and maybe Dynamic Mapping – Explore print feature further with the SPN

Linking FIM to USGS WMA and FEMA HAZUSCOLLABORATIVE PROJECTS

Goals of the Interagency FloodInundation Mapping Meetings Enhance inter-agency collaboration to bettercommunicate flood risks and reduce repetitive flood losses RiskMAP (Mapping Assessment Planning) Incentives – NFIP Community Rating System Information - Coordinated Needs Mgmt System (CNMS) Hydraulic Models and Model Development Critical Infrastructure Data Geospatial Resources (LIDAR, DEM) Web Resources and Tools Coordinated outreach Real-time Data (River Stages, Precipitation, Soils, Projected Releases, Operational Data) Flood Warning and Observations Network Flood Forecast and Predictions

Interagency CoordinationRecent Activities Related to FIM  USGS and NWS SOW  Funding Documents  USGS conducted preliminary HAZUS Assessment using NWS AHPS Shapefiles and Depth Rasters  USACE National Levee Database  Review of Various Flood Awareness Tools  USACE FEMA Sponsored Silver Jackets Workshop in August 2011 16

USGS Hazus-MH Assessments Initial Results• USGS has processed large percentage of the NWS AHPS FIM Shapefiles and Depth Rasters• Half of the Initial Results show 1 to 4B dollars in financial exposure• Delaware River at Trenton, NJ had potentially 40,00 people at Risk• Iowa River at Iowa City had 3B dollars at risk 17

NWS AHPS FIM Lessons Learned Cost Savings by Partnering Costs go down Efficiency goes up• Additional cost to complete one inundation map library as part of a FEMA FIS or local Riverine Flood Study: 5 – 10 K (~5 to 10% cost increase)• Cost doubles and time increases if inundation map library is created after the study is completed: 15 – 20 K• Develop inundation libraries in conjunction with Flood Study yields significant user benefit for small incremental cost and address map maintenance for local communities 18

NWS AHPS and USGS FIMI Lessons Learned Cost Savings by Partnering Costs go down Efficiency goes upPhase 3 cost to implement one inundation map library:Current Implementation• on NWS AHPS via current interface: 8KProposed Implementation• on NWS AHPS Google interface: estimated 3-5K (Public)• on USGS FIMI Web Mapping Application: 1.5 K * (Power-user)* Need to be evaluated for web traffic, bandwidth, and high loading. 19

July 1994 Flooding in Albany, GA•17 inches of rain from Hurricane Alberto•Hundreds of millions in damages•23,000 people evacuated

Functional Test Incorporating FIM into HAZUSPrototypeWeb Interface:RegionalAnalysis

Functional Test Incorporating FIM into HAZUSPrototypeWeb Interface:Analysis ofsingle censusblock Albany State University

Estimated Loss vs Stage - Flint River at Albany, new possibilities for analysis: Running HAZUS for multiple stages opens up GA Breakout into low lying residential area

USGS/FIMI Web Portal – Mockup of HAZUS Functionality

HAZUS Analysis of Single Census Block Census Block Boundary

Web Application Schematic Offline Multiple HAZUS RunsInundation Polygons Local parcel & & Depth Grids infrastructure data Online Web Service Server Application Database FIMI Web Portal

Notional Plan & TimelinePhase 1 (FY2011-12)• Begin Level 1 HAZUS flood risk analyses for (~60) NWS Inundation Mapping Locations, (FEMA/USGS)• Add pilot HAZUS capability to FIMI Web portal. Begin development of manual with standards and guidelines for new site development.Phase 2 (FY2012-13)• Complete and QA/QC Level 1 HAZUS analyses.• Based on evaluations from Phase 1, develop Level 2 HAZUS capability for a selected subset of the 60 NOAA/NWS sites.• Draft manual with guidelines and standards for new site developmentPhase 3 and beyond….TBD

NWS FIM Sites Ranked by AffectedPopulation and Dollar Value of Assets

The Path Forward• Commit to a Prototype Demonstration for Flood Inundation Web Mapping Services, which will link real- time observations, flood forecasts and warnings, and FIM with geospatial flood hazard information from FEMA’s HAZUS program prior to December 31st.• Collect available resource to design, develop, implement subsequent prototype demonstrating coastal components of the Flood Inundation Mapping Tool.• Work towards common standards for flood inundation mapping products, such that shapefiles and rasters can be shared and consumed by various viewers for the public and power user. 29

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