Experience │ Innovation │ Results

Stormwater Runoff Management and Modeling in Southwest Louisiana

Justin M. Shaw, MS, PE Jeanne C. Arceneaux Hornsby, MS, PE Robert L. Miller, MS, PE

StormCon 2012

PRESENTATION OUTLINE

http://tetiarebeachresort.com/resources/photos.htm

• Project History

• Hydraulic and Hydrologic Modeling

• Best Management Practices

• Public Involvement and Acquiring Funds

CONSULTANTS AND AGENCIES

LSU Atlas

ECM

PROJECT LOCATION CALCASIEU PARISH, LA

OCTOBER 2006 STORM EVENT PRECIPITATION

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Dai

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nch

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Date

Old Town Bay

Moss Bluff

Lake Charles 7 NW - Sam Houston

Lake Charles 2N

Dry Creek

OCTOBER 2006 STORM EVENT AERIAL PHOTOGRAPHS

NUMERICAL MODELING DATA COLLECTION EFFORT

• Total Study Area: 360 sq mi

• Studied Basins: 274

• Studied Channel Length: 236 mi

• Collected Survey Points: 28,000

• Hydrologic Modeling Software: HEC-HMS v3.4

• Hydraulic Modeling Software: HEC-RAS v4.1.0

• GIS Software: ESRI ArcMap v9.3.1

NUMERICAL MODELING SABINE-LACASSINE: LIDAR & STUDY AREA

NUMERICAL MODELING SABINE-LACASSINE: BASIN & LAND USE

NUMERICAL MODELING SABINE-LACASSINE: SOIL GROUP & CURVE NUMBER

NUMERICAL MODELING SABINE-LACASSINE: FEMA COMPARISON

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Sabine_South_Calibrated Plan: 100YR_Calibrated

Main Channel Distance (ft)

Ele

vatio

n (

ft)

Legend

WS Max WS

Ground

OWS Max WS

W11 R1

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Sabine_South_Calibrated Plan: 100YR_Calibrated

Main Channel Distance (ft)

Ele

vatio

n (

ft)

Legend

WS Max WS

Ground

OWS Max WS

W3_L4 R1

NUMERICAL MODELING WARD 1: AERIAL COMPARISON

NUMERICAL MODELING DRAINAGE IMPROVEMENTS

NUMERICAL MODELING SABINE-LACASSINE: CULVERT DRAINAGE IMPROVEMENTS

NUMERICAL MODELING SABINE-LACASSINE: CHANNEL DRAINAGE IMPROVEMENTS

NUMERICAL MODELING SABINE-LACASSINE: INUNDATION IMPROVMENTS

BEST MANAGEMENT PRACTICES

• Detention Ponds

• Low Impact Development

• Maximizing Green Space

MAINTENANCE PLANS

• Maintenance

• Inspection

• Access

• Owner Responsibilities

• Ordinances

PUBLIC INVOLVEMENT

• Awareness and Education

• Stormwater Newsletter

• PSA and Media

• Webpage

• Drainage Complaints

• Dumping and Littering

ACQUIRING FUNDS

• Hazard Mitigation

• Pre-Disaster Mitigation Grant

• Flood Mitigation Assistance

• Repetitive Flood Claims

• Severe Repetitive Loss

CONCLUSIONS

• Project History

• Hydraulic and Hydrologic Modeling

• Best Management Practices

• Public Involvement and Acquiring Funds

Experience │ Innovation │ Results

WATER RESOURCES Hydraulic & Hydrologic Engineering

337.237.2200

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