hurricane ike: 5 years later september 24 -25, 2013...
TRANSCRIPT
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Hurricane Ike: 5 Years Later September 24-25, 2013
SSPEED Center – RICE University
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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
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Orange County Hurricane Flood Protection System Feasibility Study
Orange County sustained major damage from Hurricane Ike
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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.
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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
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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)
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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 $3,566,342,992
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1000 ft
2400 ft
1500 ft
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Orange County Hurricane Flood Protection System Feasibility Study Protection System Top Elevation Issues
Ike Study – Arcadis Scenarios with Actual Ike storm Ike with DD7 levee (baseline) Ike without DD7 levee (showed effect of DD7
levee on OC during IKE) Ike with DD7 and OC levees
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Orange County Hurricane Flood Protection System Feasibility Study Protection System Top Elevation Issues
Ike Study – Arcadis Scenarios with Shifted Ike storm Ike with DD7 levee (baseline) Ike with DD7 and OC levees
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Orange County Hurricane Flood Protection System Feasibility Study Protection System Top Elevation Issues
Ike Study – Arcadis Scenarios with Shifted Ike storm Ike with DD7 levee (baseline) Ike with DD7 and OC levees
500 year storm equivalent
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Shifted Ike Elevation Model
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Orange County Hurricane Flood Protection System Feasibility Study Protection System Top Elevations
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Orange County Hurricane Flood Protection System Feasibility Study Results Grading System Cost Estimates Conclusions and Recommendations
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Orange County Hurricane Flood Protection System Feasibility Study Grading System Benefit/Cost Analysis Losses avoided Design complexity Innovative design elements vs. proven technology Navigation considerations Maintenance and operations considerations
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Orange County Hurricane Flood Protection System Feasibility Study
Alignment Alternative Total Cost ($) 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
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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
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Orange County Hurricane Flood Protection System Feasibility Study
QUESTIONS?
SABINE-NECHES PROJECT GROUP Carroll & Blackman, Inc.
Costello, Inc. LEAP/LJA Engineering , Inc.