4. Coastal Spine
Bolivar Roads
Intracoastal Waterway
• San Luis Pass
Existing Seawall
High
Island
Houston Ship
Channel
The Coastal Spine strategy is
to keep the ocean surge out of
Galveston Bay by using
a gated coastal barrier
5. Bolivar Roads
Intracoastal Waterway
• San Luis Pass
Existing Seawall
High
Island
Houston Ship
Channel
The first component of
the Ike Dike already exists –
the Galveston Seawall
6. Bolivar Roads
Intracoastal Waterway
• San Luis Pass
Existing Seawall
High
Island
Houston Ship
Channel
The second component –
Land Extensions of the protection
afforded by the Seawall
7. Bolivar Roads
San Luis Pass
Existing Seawall
High
Island
Houston Ship
Channel
The third component –
Flood Gates
Intracoastal Waterway
43. Ike Current
Baseline Protected Avoided loss % Reduction
Building 1,453.55 60.35 1,393.20 95.8
Content 1,519.83 75.53 1,444.30 95.0
Total 2,973.38 135.88 2,837.50 95.4
Ike 2080
Baseline Protected Avoided loss % Reduction
Building 2,699.68 123.64 2,576.04 95.4
Content 2,224.87 111.08 2,113.79 95.0
Total 4,924.56 234.72 4,689.84 95.2
Ike 2080+SLR
Baseline Protected Avoided loss % Reduction
Building 4,837.55 469.80 4,367.75 90.3
Content 3,909.14 411.85 3,497.29 89.5
Total 8,746.69 881.65 7,865.04 89.9
44. 500-yr Current
Baseline Protected Avoided loss % Reduction
Building 4,086.32 1,137.14 2,949.18 72.2
Content 3,935.81 1,194.32 2,741.49 69.7
Total 8,022.13 2,331.46 5,690.67 70.9
500-yr 2080
Baseline Protected Avoided loss % Reduction
Building 8,764.52 2,074.89 6,689.63 76.3
Content 6,973.65 1,773.17 5,200.48 74.6
Total 15,738.17 3,848.06 11,890.11 75.5
500-yr 2080+SLR
Baseline Protected Avoided loss % Reduction
Building 18,044.67 3,308.30 14,736.37 81.7
Content 13,839.24 2,784.57 11,054.67 79.9
Total 31,883.92 6,092.87 25,791.05 80.9
45. The overall strategy is to keep
the ocean surge out of
Galveston Bay by using a
coastal barrier (the Ike Dike)
Before
Ike
After
Ike
THANK YOU
www.tamug.edu/CTBS
Editor's Notes
The critical need is to stop the surge at the coast – this protects the entire Bay area
1. Protects from catastrophic overflows and
2. Doesn’t allow the ocean surge into the Bay which in turn prevents massive internal surges
The critical need is to stop the surge at the coast – this protects the entire Bay area
1. Protects from catastrophic overflows and
2. Doesn’t allow the ocean surge into the Bay which in turn prevents massive internal surges
The critical need is to stop the surge at the coast – this protects the entire Bay area
1. Protects from catastrophic overflows and
2. Doesn’t allow the ocean surge into the Bay which in turn prevents massive internal surges
San Luis Pass has only small boat traffic so gate design straightforward
Bolivar Roads needs a more comprehensive solution
Storm 27 (100-yr proxy) surge Inundation with existing condition making landfall near San Luis Pass.
Storm 27 (100-yr proxy) surge Inundation with protection making landfall near San Luis Pass.
Proxy Storm 27 (100-yr) Inundation difference
Storm 27 (100-yr proxy) residential loss per census block with existing condition, making landfall near San Luis Pass.
Storm 27 (100-yr proxy) residential loss per census block with protection, making landfall near San Luis Pass.
76.5 million – 2.9 million in one block
Storm 27 (100-yr proxy) residential loss avoided per census block.
