Creating the Plan: A Sustainable Floodplain Management Process Model Natural Hazard Mitigation Association

Charlotte-Mecklenburg, NC

Tim Trautman, Affiliation

2

Welcome!

Learning Objectives 1. Describe the decision model behind floodplain

management

2. Explain the future conditions approach to floodplain mapping

3. Explain the strategic planning approach to flood mitigation

3

Charlotte-Mecklenburg

• Mission: Protect Life and Property and restore the natural & beneficial floodplain functions

• 1993 Storm water utility

• FEMA Floodplains

• 1999 Guidance Document

4

History

5

Community Vision

6

7

1998 2005 2003 2002 1995 1999 1996 2000 2001 2004 1997

Guidance Document

8

2011 2016 2015 2008 2012 2009 2013 2014 2017 2010 2007

Risk Based Local Buyouts

9

Storm Water Management: Decision Elements

10

Facts/ Data

Actions/ Implement

Partners/ Community

Ideas/ Strategy

Storm Water Management: Decision Model

11

PROBLEM SOLVING

CYCLE

Facts/Data

Partners/ Community

Ideas/ Strategy

Problems: Situations people are motivated to change

Solutions: Actions that solve “Problems”

Actions/ Implement

Continuous Improvement Evaluation

IMPLEMENTATION CYCLE

Shared Learning • Do you have a floodplain vision that adequately promotes

long-term resilience?

• How could utilizing the Decision Model overcome challenges you face?

12

Powerpoint Templates

13

Local Role in Floodplain Mapping Map Uses:

• Guide Development

• Flood Insurance

• Risk Communications

• Planning/ Zoning

14

Role of Local Government: Public Safety and Protect Life and Property

Community Resiliency Local Governments - at the forefront of building resilient communities

• Land use plans & decisions

• Regulations

• Capital Improvements

NEED MAPPING PRODUCTS

15

Homeowners: Can You Tell the Difference?

16

Homeowners: Can You Tell the Difference? (cont.)

17

First Maps Dated 1978 – 2004 1% annual chance Flood

Floodplain Maps- History Map Updates 2004

1% annual chance Flood

Insurance Maps available online with additional property information

2013 Risk MAP Updates

Products & Risk Communication

19

http://mapserver.mecklenburgcountync.gov/3dfz/

Flood Insurance Rate Maps • FEMA Floodplain (Flood

Insurance) • Community Floodplain

(local use) • Floodways

New Flood Risk Products • 3D Flood Depth Maps • Annual likelihood of

flooding • Change Comparisons

New Floodzone Website • Delivery of Flood Risk

Information • Mapping • Risk Assessment • Risk Reduction

Why Floodplain Maps Change

Technological Advancements

Natural & Man Made Land Changes

Climatological Changes

• Extended Historic Rainfall Records • Changes in Rain Intensity, Duration, Frequency, etc.

• Better Data • Improved Computer Models • Enhanced Map Products

• Natural Geomorphic Stream Changes • Development within the Watershed

20

Future Floodplains • Philosophy: Floodplain meant to flood

• Upland land for flood storage in new construction

• Account for future hydrologic changes to 1%

Lower future risk & Lower future flood insurance rates when maps increase!

21

Two Floodplains

22

FEMA Floodplain

• 100-year flood • Primarily used to rate

flood insurance

Community Floodplain

• 100-year flood • Full build out in the

watershed • Used adopted Land Use

Plans

Future Land Use (Today) • Estimating full build out

conditions • Planning Commission’s Land

Use plans as starting point • 80 future land use categories • Translate to 12 categories

impervious area categories for floodplain mapping

• Comparison – Existing to Future

23

Floodplain Mapping: Decision Model Usage

PROBLEM SOLVING

CYCLE

Facts/Data

Partners/ Community

Ideas/ Strategy

Problems: Situations people are motivated to change

Solutions: Actions that solve “Problems”

Actions/ Implement

Continuous Improvement Evaluation

IMPLEMENTATION CYCLE

24

Shared Learning • What do you think of using "future floodplains" as part

of public policy?

• How should communities define an acceptable risk level & adapt to changes?

25

Powerpoint Templates

26

Flood Mitigation Program

27

Protecting Life & Property Since 1999 • Removed from Floodplain: ▫ Over 320 buildings/ homes ▫ Over 550 families

• Floodplain restored: ▫ 150 acres

• Actual Damage Avoided: ▫ 100's buildings ▫ ~$25M in losses avoided

• No Disaster funding

28

Enhance Quality of Life Since 1996 • Creek Use Policy • CIP Projects ▫ Over 20 Floodplains miles ▫ Over 550 families

• Development Ordinances ▫ Buffers ▫ LID & Post-Construction

Controls • Stream Walks ▫ 280 miles per year

29

Residential Neighborhoods

30

retroFIT Program • Incentivize private mitigation • Floodplain property owners • Financial & technical assistance • Direct grant program • FY16 - Pilot Year $250,000

31

Flood Mitigation: Decision Model Usage

PROBLEM SOLVING

CYCLE

Facts/Data

Partners/ Community

Ideas/ Strategy

Problems: Situations people are motivated to change

Solutions: Actions that solve “Problems”

Actions/ Implement

Continuous Improvement Evaluation

IMPLEMENTATION CYCLE

32

Shared Learning • How would you incentivize and implement mitigation

locally?

• How can you integrate mitigation into long-term planning efforts?

33

Powerpoint Templates

34

After a Flood... • Celebrate Success

• How much damage was avoided?

▫ Buildings

▫ Vehicles

• How much floodwater was contaminated?

35

Creek Water Quality Profile

36

Flood Mitigation Results

$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)

36 B

uild

ings

75 B

uild

ings

12 B

uild

ings

13 B

uild

ings

1Bu

ildin

gs

5 Bu

ildin

gs

5 Bu

ildin

gs

11 B

uild

ings

27 B

uild

ings

42 B

uild

ings

22 B

uild

ings

12 B

uild

ings

15 B

uild

ings

16 B

uild

ings

33 B

uild

ings

37

Mitigation Impacts

>

2,0

00

Flo

odp

lain

B

uil

din

gs

-

32

Bu

ild

ings

-

68

Bu

ild

ings

-

10

Bu

ild

ings

-

6 B

uil

din

gs

-

1 B

uil

din

g

-

4 B

uil

din

gs

-

4 B

uil

din

gs

-

10

Bu

ild

ings

-

18

Bu

ild

ings

-

41

Bu

ild

ings

-

11

Bu

ild

ings

-

15

Bu

ild

ings

-

15

Bu

ild

ings

-

7 B

uil

din

gs

-

1 B

uil

din

g

0

200,000

400,000

600,000

800,000

1,000,000

1,200,000

1999 2000 2001 20022003200420052006200720082009 2010 2011 2012 2013 2014

> 35% Reduction

>50% Reduction

Co

mm

un

ity

Flo

od

Ris

k

Y e a r

38

New Development Impacts Charlotte-Mecklenburg, NC

Flood Risk Profile

Co

mm

un

ity

Flo

od

Ris

k

Y e a r

> 2

,00

0 T

otal

Bu

ild

ings

+ 1

39 B

uil

din

gs

+ 1

02

Bu

ild

ings

+ 9

5 B

uil

din

gs

+ 4

2 B

uil

din

gs

+ 5

9 B

uil

din

gs

+ 6

4 B

uil

din

gs

+ 7

0 B

uil

din

gs

+ 6

3 B

uil

din

gs

+ 2

6 B

uil

din

gs

+ 1

3 B

uil

din

gs

+ 1

4 bu

ild

ings

+ 1

3 B

uil

din

gs

300,000

400,000

500,000

600,000

700,000

800,000

900,000

1,000,000

1,100,000

1,200,000

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

3% Increase (704 new bldgs)

~25% Reduction

39

Floodplain Risk Profile

0

100

200

300

400

500

600

700

800

900

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

Tota

l Ris

k Po

ol P

oin

ts (T

hou

san

ds)

Potential future buyouts ~750 buildings

Residual Risk and Floodproofing

0 - $250K 52%

$250K - $500K

22%

>$500K 26%

Mitigation Cost <$250/Point 19%

$250 - $500/Point

17%

$500 - $1,000/Point

15%

>$1,000/Point 49%

Cost per Point

42% reduction

40

Review of Key Learning Objectives 1. Describe the decision model behind floodplain

management

2. Explain the future conditions approach to floodplain mapping

3. Explain the strategic planning approach to flood mitigation

41

Thank You for Your Participation!

• Questions and/or comments

• Contact information

Natural Hazard Mitigation Association P.O. Box 170984 Boston, MA 02117 Email: nathazma@gmail.com www.nhma.info

42