FSA Annual Conference: June 15-17, 2016 · 2017-01-13 · FSA Annual Conference: June 15-17, 2016...

FSA Annual Conference: June 15-17, 2016

Gene Altman, PE

Alvan Karlin, PhD, CMS, GISP

Mark Fulkerson, PhD, PE

OUTLINE

• SWFWMD’s Watershed Management Program

• High Water Database

• Flood Imagery

• Model Verification

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WATERSHED MANAGEMENT

PROGRAM

• 97 completed

• 37 ongoing

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• Flooding Happens

Lake Geneva, Ridge Manor, FL

HIGH WATER DATABASE

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• Flooding Happens

• Historical Evidence

• Public Awareness

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• Flooding Happens

• Historical Evidence

• Public Awareness

• Limited Data

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Built Flooded Mitigated

2002 2004 2006

• Flooding Happens

• Historical Evidence

• Public Awareness

• Limited Data

• Decision Making

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• Flooding Happens

• Historical Evidence

• Public Awareness

• Limited Data

• Decision Making

• Verification Tool

No Historical FEMA Floodplain Modeled 100-yr Floodplain (SWFWMD, 2010) 10

• Existing Data Sources

HIGH WATER DATA

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• Existing Data Sources

• Field Measurements

HIGH WATER DATA

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FLOOD COMPLAINTS (4,000)

KNOWN FLOODING AREAS (4,300)

FLOOD PHOTOS (3,300)

HISTORICAL WATER LEVELS (6,600)

HIGH WATER DATABASE

http://ftp.swfwmd.state.fl.us/pub/gisdata/HighWater_Database/ 13

Historical 100-yr Floodplain (FEMA, 1982)

1970s Imagery

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Historical 100-yr Floodplain (FEMA, 1982)

2011 Imagery

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Current 100-yr Floodplain from WMP (SWFWMD, 2011)

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srh.noaa.gov 17

nws.noaa.gov

TROPICAL STORM DEBBY

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• 800 Flood Photos

• 215 Flood Compaints

• 620 High Water Elevations

IMAGE ACQUISITION

MicroSoft/Vexcel UltraCamX

Cessna 208 - Grand Caravan

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Satellite Pour L’Observation de la Terra (SPOT 5)

Launched: 4 May 2002 Stopped Functioning: 31 March 2015

Image Captured: 28 June 2012 Image Received by SWFWMD: 29 June 2012

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• SPOT satellite (20 meters)

• High-resolution aerial (0.6 meters)

Flood Imagery

Flooded roads and businesses

Flooded homes

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Peck Sink Watershed

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Terrain

Peck Sink

Elevation (250 to 20 feet)

High Runoff/ Low Infiltration

Internally Drained

WATERSHED CHARACTERISTICS

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TS Debby

Rainfall Amount 12 to 16 inches

Flooded Area 3.6 mi2

100-Year Storm

13 inches

4.0 mi2

Model Verification

High Water Data

TS Debby Floodplain TS Debby Floodplain 24

• SPOT satellite (20 meters)

• High-resolution aerial (0.6 meters)

Model Verification

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SPOT Satellite High-Resolution Aerial

FLOOD IMAGERY VS MODEL VERIFICATION FLOODPLAIN

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OBLIQUE PHOTO WITH HIGH WATER MARKS

(Photo courtesy of Hernando County Emergency Management) 27

In Conclusion…

• Value and Benefits

• Effort Involved

• Cost Savings

Cost to develop detailed floodplains for this watershed $377,418

Cost to acquire flood imagery for 300 square miles $25,000

Cost to collect high water elevations at 200 locations $10,000

FEMA’s Hazard Mitigation Grant Program Acquisition Costs

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Contact Information

1. Gene Altman, PE, gene.altman@swfwmd.state.fl.us

2. Alvan Karlin, PhD, CMS, GISP, al.karlin@swfwmd.state.fl.us

3. Mark Fulkerson, PhD, PE, mark.fulkerson@swfwmd.state.fl.us

Publication

Karlin, A.; Fulkerson, M; Altman, G. Using SPOT and Aerial False-Color Infrared (fCIR) Imagery to Verify Floodplain Model Results in West Central Florida. Geosciences. 2016, 6, 24. 29

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QUESTIONS, COMMENTS,

OPEN DISCUSSION