Powerpoint Templates

Planning for Future Hazards

Topic Overview:

• Floodplain management strategies to reduce future damage

• Planning and recovery strategies

• Short term and long term risk reduction

• Setting a floodplain management vision

• Partnerships with local stakeholders

Planning for Future Hazards

Community Risk Dashboard Concept

Flood Risk Portfolio

Charlotte-Mecklenburg

• Protect life and property

• Restore natural floodplain functions

• 1993 Storm Water Utility

• 1999 Guidance Document

History

Hurricane Florence

• What will NC communities look like after the next similar rainfall?

Flood Resiliency

The ability to overcome a situation of crisis No singular action will eliminate Community Flood Risk!

8

Flood Risk Management

Community Vision

Begin with the END in Mind

Community Values & Priorities:▫ Floodplains

▫ Community Resilience

▫ Health & Safety

How we do it

Facts/

Data

Actions/

Implement

Partners/

Community

Ideas/

Strategy

Food for thought…

• Approach to developing a vision?

• Adequately promote long term resilience?

Powerpoint Templates

Local role in Flood Mapping

What about Floodplain Maps?• Safe Development• Financial Health - Flood Insurance• Sustainable infrastructure investments• Emergency Response tool

Role of Local Government

• Local Governments - at the forefront

• Land use plans & decisions

• Regulations

• Capital Improvements

• NEED HAZARDMAPPING

Community Resiliency

Why Floodplains Change

Technological Advancements

Natural & Man Made Land Changes

RainfallChanges

• Extended Historic Rainfall Records

• Changes in Rain Intensity, Duration,Frequency, etc.

• Better Data• Improved

computer models• Enhanced Map

Products

• Natural GeomorphicStream Changes

• Development

First Maps Dated 1978 – 20041% annual chance Flood

Floodplain Maps- History

Map Updates 20041% annual chance Flood

Insurance Maps available online with additional property information

2013 Risk MAP Updates

Floodplain Datasets

Consider:• Future Floodplains• Sea Level Rise• Multi-frequency• Flood depth• Velocity and storm surge

Flood risk & insurance rates increasewhen future map elevations increase!

Food for thought…

• Pros and cons of using “future floodplains”?

• Other approaches to manage future risk?

Powerpoint Templates

Flood Mitigation Program

FEMA Mitigation

Grants (Buyouts, Elevation)

1999

QuickBuyProgram

(post-flood)

2003, 2008, 2011

Local Risk-Based

Buyouts

2012

Flood-proofing building retrofits

2015

Since 1999

• Removed 450 buildings

• Removed 750 families

• Restored 180 acres

• Avoided $27M in losses

• Mitigated about 40% of risk in SFHA

No Disaster Declaration funding

Protecting Life & Property

Since 1996

• Creek Use Policy

• CIP Projects

• Over 30 Floodplain miles

• Development Ordinances

• Buffers

• LID & Post-Construction Controls

• Greenway Development

• 50 miles, 200 mile goal

Enhance Quality of Life

Residential Neighborhoods

Apartments

• Incentivize private mitigation• Floodplain property owners• Financial & technical assistance• Direct homeowner grants• $250k/year available

retroFIT Program

RetroFIT Candidates

Food for thought…

• Ways to incentivize and implement mitigation?

• Increasing resilience for low income owners?

Powerpoint Templates

Risk Reduction Planning

Purpose of the Plan

• Recommend specific flood mitigation techniques at a building level

• Assist in planning and prioritizing future mitigation projects

• Use a dynamic and holistic, risk-based approach

RARR Planning

• ArcGIS extension to evaluate properties

RARR - Data Needs

• Floodplains/Floodways

• Multi-frequency floodzones

• Water surface/depth grids

• High velocity zones

• Elevation Certificates

• Tax, building, & parcel data

• Aerial & Ortho photos

• Local planning data

• Storm drain inventory

Flood Risk Factors

– Finished Floor Elevation (living space)– Frequency of flooding– Location within the floodplain (including velocity

zones)– Critical Facility– Mechanical and electrical systems – Vehicles– Ingress/egress from the building and property– Exterior improvements

(detached garages, sheds, pools, etc.)– Number of dwelling units impacted

19 Mitigation Techniques

1. Acquisition and Demolition

2. Demolition and Rebuild

3. Acquisition and Relocation

4. Acquisition, Demolition/ Relocation, and partial Re-sale

5. Structure Elevation

6. Abandon Basement and Fill

7. Full Dry Floodproofing

8. Full Wet Floodproofing

9. Audible Flood Warning System

10. Storm Water Detention Facilities

11. Storm Water System Control

12. Automated Flood Notifications

13. Public Education

14. Flood Insurance

15. Levee/Floodwall

16. Protecting Service Equipment

17. Partial Dry Floodproofing

18. Partial Wet Floodproofing

19. Ring Levee/Wall/Berm

Example Project Area

Losses Avoided Tool (LAT)

• Total losses avoided over time– Cumulative losses avoided for each flood event

• Return on Investment (ROI)– ROI = total losses avoided divided by implementation cost

LAT – Data Needs

• Building values at the time of the event– Building replacement value lookups

• Can be imported from RARRT

– Displacement cost per sq.ft.

– Emergency responder cost

▪ Mitigation Implementation

• Updated as new mitigations occur

– Water Surface Elevation Rasters

• 2, 10, 25, 50 and 100 Year Events

– Vehicle Parking Locations

– Property Improvements

– Parcel Data

▪ Event Specific High Water Marks

▪ Guidance for HWM locations prepared ahead of time so crews know where to go when an event occurs

LAT – Example

• Utilize High Water Marks and modeled WSEL rasters to estimate return interval

• Return interval used to estimate elevation (upsteam/downstream)

• Overlay with prior Elevation Certificate

Finished FloorElevation = 605.1

WSEL = 607.93Depth within Structure = 2.83 ft

Estimated Damage

Building Losses

• $66,000

Crawlspace Losses

• $19,500

Content Losses

• $19,350

Vehicle Losses

• $10,400

Displacement Costs

• $15,500

Emergency Response Costs

• $5000

Return on Investment

Losses Avoided / Total Project Cost

• ROI = $218,950 / $173,827= 1.26

LAT – Example

4 Keys to Planning

1. Vision w/ desire to reduce damage in future

2. Communication & involvement from stakeholders

3. Quality datasets

4. Conscientious on problems

Food for thought…

• Consider how to make hazard mitigation planning more useful

• Communicating information so it leads to action

Powerpoint Templates

$0M

$20M

$40M

$60M

$80M

$100M

$120M

$140M

$160M

2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014

$58M

$272M $286M $306M

INVESTMENT/COST (ACT)

FUTURE LOSSES AVOIDED (EST)

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Flood Mitigation History

0

100

200

300

400

500

600

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800

900

FY00 FY01 FY02 FY03 FY04 FY05 FY06 FY07 FY08 FY09 FY10 FY11 FY12 FY13 FY14 FY15 FY16 FY17 FY18

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Char-Meck Floodplain Properties - Flood Risk Score Pool

Potential future buyouts

~750 buildings

Residual Risk and Floodproofing

Flood Risk History

$3,766,948.0820,137

0

10,000

20,000

30,000

40,000

50,000

60,000

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$-

$2,000,000

$4,000,000

$6,000,000

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$10,000,000

$12,000,000

$14,000,000

FY01 FY02 FY03 FY04 FY05 FY06 FY07 FY08 FY09 FY10 FY11 FY12 FY13 FY14 FY15 FY16 FY17 FY18

FLOOD MITIGATION PERFORMANCE BY FISCAL YEARTotal Cost Flood Score Mitigated Average Cost per Year Average Annual Points Mitigated

Risk Reduction Performance

Community Risk Dashboard Concept

Flood Risk Portfolio

Powerpoint Templates

1. Have a vision

2. Identify resilient funding

3. Show the benefits & track results