Hurricane Ike: 5 Years Later September 24-25, 2013

SSPEED Center – RICE University

Orange County Hurricane Flood Protection System Feasibility Study

Background Orange County sustained major damage from Hurricane Ike County Commissioners authorized expenditure of some Disaster

Recovery funds to conduct a study Team of Carroll & Blackman, Inc., Costello, Inc., and LEAP/LJA

Engineering was selected as study engineer team TWDB Planning Grant for 50% of study cost was awarded in

March 2010

Orange County Hurricane Flood Protection System Feasibility Study

Orange County sustained major damage from Hurricane Ike

Orange County Hurricane Flood Protection System Feasibility Study Study Purpose The purpose of the study was to consider and evaluate the feasibility of construction of a Hurricane Flood Protection System to provide the County with a strategy to address goals for flood protection and loss reduction.

Orange County Hurricane Flood Protection System Feasibility Study Key Design Issues/Parameters Level Of Protection H & H Design And Pump Station Sizing Earthen Levee Design Floodwall Design Right-of-way Crossings - Transportation, Pipelines, Utilities, Power Navigation Considerations Geotechnical Study Environmental And Cultural Resources

Orange County Hurricane Flood Protection System Feasibility Study Review Alignment Alternatives County-wide protection with gate on the Neches River County-wide protection with levee on east and west

bank of the Neches River Industrial Complex (Chemical Row) protection system County-wide protection with gate on the Neches River

and Sabine River crossing (SWB location)

AlignmentArea Protected

(ac)

Residential Structures Protected

Population Protected

Assessed Value Protected

ID 5,276 114 236 $22,741,622

SR-NR 71,436 21,183 47,410 $2,121,107,223NRW 10,888 9,341 21,642 $1,218,818,959NRX 60,744 1,877 4,448 $219,196,026SRX 29,052 449 916 $7,220,784

TOTALS 172,121 32,850 74,416 $3,566,342,992

1000 ft

2400 ft

1500 ft

Orange County Hurricane Flood Protection System Feasibility Study Protection System Top Elevation Issues

Ike Study – Arcadis Scenarios with Actual Ike storm Ike with DD7 levee (baseline) Ike without DD7 levee (showed effect of DD7

levee on OC during IKE) Ike with DD7 and OC levees

Orange County Hurricane Flood Protection System Feasibility Study Protection System Top Elevation Issues

Ike Study – Arcadis Scenarios with Shifted Ike storm Ike with DD7 levee (baseline) Ike with DD7 and OC levees

Orange County Hurricane Flood Protection System Feasibility Study Protection System Top Elevation Issues

Ike Study – Arcadis Scenarios with Shifted Ike storm Ike with DD7 levee (baseline) Ike with DD7 and OC levees

500 year storm equivalent

Shifted Ike Elevation Model

Orange County Hurricane Flood Protection System Feasibility Study Protection System Top Elevations

Orange County Hurricane Flood Protection System Feasibility Study Results Grading System Cost Estimates Conclusions and Recommendations

Orange County Hurricane Flood Protection System Feasibility Study Grading System Benefit/Cost Analysis Losses avoided Design complexity Innovative design elements vs. proven technology Navigation considerations Maintenance and operations considerations

Orange County Hurricane Flood Protection System Feasibility Study

Alignment Alternative Total Cost ($) Grading System

Rank

No-Action $0 NA

Orange County Protection - East Bank of Neches River (SR + NR)

$1,472,000,000 63

Protection System on East & West Bank of Neches River (SR + NR + NRW)

$1,738,000,000 74

County-Wide Protection with Neches River Crossing (SR + NX)

$1,540,000,000 47

County-Wide Protection with Neches River Crossing and Sabine River Crossing (SR + NX + SRX)

$1,830,000,000 60

Protection of Industrial Complex (ID)

$212,000,000 35

Orange County Hurricane Flood Protection System Feasibility Study Conclusions and Recommendations Develop a Preliminary Engineering Report (PER) of the

Neches River Crossing and Sabine River Alignment and the Industries Alignment as a possible First Phase of construction.

Investigate Potential Funding and Financing Sources

Investigate Potential Management and Operations Entities

Orange County Hurricane Flood Protection System Feasibility Study

QUESTIONS?

SABINE-NECHES PROJECT GROUP Carroll & Blackman, Inc.

Costello, Inc. LEAP/LJA Engineering , Inc.