Georgia Flood M.A.P. Program

Transcription

1 Georgia Flood M.A.P. Program Georgia Flood M.A.P. Program The Upper Chattahoochee River Basin Risk MAP Project Transitioning State Program to align with FEMA s Risk MAP Program Increase focus on risk assessment and planning Continue partnerships with Federal, State, and Local Agencies Develop watershed based studies Acquire and utilize high accuracy topographic data Deliver risk products and datasets Enhanced Outreach Program Outreach Guidebooks Coastal Outreach Strategic Plan Increased Community Engagement Robust Website ( Georgia Association of Floodplain Management March 28 th, Upper Chattahoochee River Basin Project (UCRB) Fiscal Year 2009 Project Population 4 million Historic flooding event September 2009 Watershed-Based, Full Risk MAP Implementation Updated H&H model for 107 miles of Chattahoochee River Extensive survey Calibrate models using HWM results from recent flooding events Forsyth, Gwinnett, DeKalb, Cobb, Fulton, Douglas, & Coweta Counties New/Updated Detailed studies for high priority subbasins Incorporated local leverage studies Utilized high-accuracy elevation data Countywide and Physical Map Revisions (PMR) Why Develop Risk MAP Products for UCRB Project initiation soon after major flooding disaster Misunderstanding of flood risk throughout project area Mixed messages & inaccurate reporting from media Highly accurate, quality H&H models & LiDAR Most populated area in the State Sophisticated communities that could utilize & apply the data 3 Georgia Flood M.A.P. Products Key Outreach s RiskMAP Products Standard FloodRisk Database Flood Risk Report Flood Risk Map CSLF Depth& Analysis Grids Level 1 HazusAnalysis Watershed Risk Summary Community Risk Summary CSLF 1% annual chance flood loss estimates ID new/restudy areas GeorgiaEnhanced Affected structures (if available) ParcelLevel Identification Website Display with Address Look-Up Water surface elevation grids Velocitygrids (Dams) 20% Annual Chance Flood event (GEMA) Unrevised flooding sources Dam Breach grids (Early Demo) Website Display of % chance flooding Level 2 Hazuswith User-Defined Facilities Unrevisedflooding sources Areas of Mitigation Interest Countywide Report User Defined loss estimates Ranked Areas of Mitigation Interest Dam Enhancements User defined loss estimates Ranked Areas of Mitigation Dam Enhancements 1. Multi-Agency Coordination 2. Scoping/Discovery 3. Community Kick-off 4. Draft Work Map 5. County Commission Briefing 6. PDCC 7. Flood Risk Open House(s) 8. Resilience 1

2 Risk MAP Timeline Georgia Flood M.A.P. Timeline A B Community Engagement Draft Map Review Multi-Agency Project Kick-Off Coordination Resilience County Commission Briefings Scoping/Discovery Preliminary Resilience FIRM Optional Flood Risk Review Discovery Issuance Consultation Coordination Potential Officer (CCO) / FIRM Draft Outreach Strategy and Updated actions to Open House Effective Communication Plan Discovery incorporate Changes Risk MAP Products (Flood FIRM (Regulatory) Map into Since Last Risk Map, Report, & Data Risk MAP Products Draft Project mitigation Map & (Flood Risk Map, Sets) Plan plans Impacts Report, & Data Sets) F C D E F G Planning Execution A. Planning & Budgeting (3 Mos.) D. Risk Awareness & Mitigation Outreach (1-3 Mos.) B. Discovery (2-4 Mos.) E. Proposed NFIP Map Changes & Impacts (1-3 Mos.) C. Data Development & Sharing (9-15 Mos.) F. Preliminary NFIP Map Release & Mitigation Plan Path Forward (1-3 Mos.) G. Due Process & Path Forward (9-15 Mos.) 7 Key Outreach s Risk 1. Multi-Agency Coordination a. Discovery-like Stakeholder Engagement/Coordination b. Media backgrounder & Talking Points 2. Scoping/Discovery a. CNMS Stream Validation Status b. Preview of Risk MAP Data Expected, Local Data Needs c. Risk & Action Messaging 3. Community Kick-off a. Validate Expectations and Scope b. Reinforce Expected Timelines & Risk MAP Products c. Emphasize Use of Local Outreach Guideboook/Website Multi-Agency Coordination Public & Stakeholder Outreach Federal FEMA USGS USACE NOAA State GEMA GA Safe Dams GA Municipal Association GA Soil & Water Conservation Commission Regional Georgia Regional Commissions Metro North Georgia Water Planning District Upper Chattahoochee River Keeper Chattahoochee National Recreational Area Local County Commission Community Officials FPA Emergency Management Planning Private Georgia Power Community Outreach & Public Education Who: Residents, Business owners, media, internal What: Why new maps, proposed changes and effects, options available; take action to reduce risk How: stakeholder/hoa/staff meetings, flyers, website, notices/fact sheets in library/community buildings, news articles (radio, TV, newspaper, stakeholder newsletters) When: Start Now GA DNR Support PDCC Community officials Flood Risk Open House meeting - Public Georgia DNR Outreach Planning Guidebook Key Outreach s Risk 4. Draft Work Map a. CSLF presented / Website Demo b. Identify and Quantify Parcels/Buildings Affected 5. County Commission Briefing a. CSLF Parcel/Building by District Presented b. Recap of Flood Insurance Coverage, Payouts, Exposure c. Preview of Risk MAP Products for Communication/Action d. Offer Individual Property Owner Notification Support e. Media Backgrounder & Talking Points CSLF on GeorgiaDFIRM.com 2

3 Commission District DeKalb County Project Results Zone Changes Current Effective 100-yr Floodplain (acres) Preliminary 100-yr Floodplain (acres) Decrease Increase Net Change 1 2, , , , , , SD -6 7, SD -7 10, , ,091 acres = Current Effective 100-yr Floodplain acres = Preliminary 100-yr Floodplain 13 Commission District DeKalb County Project Results Zone Changes Current Effective Floodway (Structures) Added Preliminary Floodway (Structures) Removed Net Current Effective 100-yr Floodplain (Structures) Preliminary 100-yr Floodplain (Structures) Change Total Added Removed Net Change , , , , , SD , ,905 SD , ,243 1,197 Structures = Current Effective Floodway 3,317 Policies in Force/2,902 1,192 Structures = Preliminary Floodway Unincorporated DeKalb - 5 Structures 1,359 Total Claims/1,165 5,330 Structures = Current Effective 100-yr Floodplain Unincorporated DeKalb 5,148 Structures = Preliminary 100-yr Floodplain > $21m paid/ >19m Unincorporated Structures DeKalb Total 14 Individual Property Owner Notification Process Category Parcel ID Parcel A Remains In Flood-way X Property In SFHA Newly Added to Flood-way Remains In Flood-plain Newly Added to Flood-plain Newly Out (within 500 of SFHA) Property Out of SFHA Newly Out (ov er 500 out of SFHA) Remains Out (within 500 of SFHA) Remains Out (ov er 500 out of SFHA) Forsyth County Example Extensive Parcel Data Available New SFHAs Developed for Current Risk MAP study Used Procedure to Send out 2,800 Notifications to Property-Owners Over 200 Residents attended Flood Risk Open House. Other communities in the UCRB project area are starting to use the notification process. 15 Key Outreach s Risk 6. PDCC a. CSLF b. HAZUS Products HAZUS Product Example 7. Open Houses a. Individual Property Flood Risk Snapshot CSLF & 30- yr % Chance Flooding b. UCRB Project c. Floodplain Management d. Flood Insurance e. Appeals and Protest 3

4 HAZUS Product Example Watershed Risk Evaluation - HAZUS DeKalb Co Gwinnett Co 17 sq mi 35 sq mi 396 Census Blocks 21,000 households 427 Census Blocks 10,000 households 60,185 people 29,342 people 18,743 Buildings 11,640 buildings 15 miles of studied stream 10 miles of studied stream.67 sq mi of FHA.53 sq mi of FHA 20 Level 1 vs Level 2 UDF HAZUS Analysis Comparison (100-yr Event) Public Open House Basic Level 1 HAZUS grossly overestimates Leverage local data to perform User- Defined Facilities Analysis in HAZUS wherever possible Avoids poorly informed mitigation focus and undue political concerns BarbashelaCreek Watershed Level 2 UDF Type Level 1 Losses ($) Losses ($) Residential $41,157,000 $3,974,464 Commercial $8,768,000 $456,528 Industrial $1,834,000 $0 Government/Non Profit $84,000 $0 Education $250,000 $0 Religious $2,836,000 $0 Agriculture $122,000 $0 Total $55,051,000 $4,430,992 Website CSLF Flood Risk Profile Printout Station Flood Risk Snapshot 4

5 Percent Chance of Flooding Depth & Analysis Grids Historic September 2009 Rainfall Maps Open House Exhibit Sept 09 Event Flood Insurance Station Key Outreach s Risk 8. Resilience (post LFD timeframe) a. In Depth Review of All Risk MAP data and Products with Local Officials i. Flood Risk Report Watershed and Countywide Versions ii. Flood Risk Maps iii. Depth Grids & Probability Grids iv. HAZUS Results b. Include GEMA for Grants and Mitigation Planning Opportunities a. Suggest Possible Areas for Mitigation Focus c. Final Push for Flood Insurance Grandfathering 5

6 HAZUS Enhanced User Defined Facilities Results HAZUS Displaced Population HAZUS Displaced Population HAZUS Critical Facilities Conclusion Frequent & constant community engagement leads to increased understanding and buy-in Community Kick-off meetings establish project expectations and minimizes surprises at preliminary issuance Draft Map Review meetings promote community input and community ownership of project Commissioner briefings are the best way to reach out to elected officials and the media and increase awareness of their community s flood risk Overwhelming positive response and pro-active involvement from communities with individual property notification Individual property notification increases Open House attendance Risk products leads to better understanding of flood risks and understanding of flood risks lead to action Proactive engagement with media minimizes inaccurate reporting and sensationalized stories 35 Contacts GA Floodplain Mgmt Coordinator Collis Brown, CFM Collis.Brown@dnr.state.ga.us Project Manager Shannon Brewer, CFM sbrewer@dewberry.com