A decade after Hurricane Ike devastated the Texas Gulf Coast, the U.S. Army Corps of Engineers announced Friday that a more ambitious version of the proposed “Ike Dike” — a 70-mile-long coastal barrier that could cost as much as $31 billion — is the preferred choice for protecting the state’s coastline from future storm surges.
The decision moves the project closer to ultimately being built, but leaves unanswered how to pay for it, especially with the estimated cost skyrocketing to between $23 billion and $31 billion — two to three times above original estimates.
The option backed by the Army Corps and the Texas General Land Office is similar to the original “Ike Dike” proposal developed by researchers at Texas A&M University in Galveston after Ike hammered southeast Texas in 2008, with some subtle differences.
“This study actually incorporates both coastal storm risk management features and ecosystem restoration features up and down the coast and some coastal storm risk management down on South Padre (Island),” said Kelly Burks-Copes, the project manager for the Army Corps’ study. “It’s a comprehensive study so it’s looking at the entire coast of Texas, much bigger than the Ike Dike per se.”
The coastal barrier would be a system of levees and sea gates beginning on high ground north of High Island and running the length of the Bolivar Peninsula. It would then cross the entrance of Galveston Bay and extend the length of Galveston Island, incorporating the existing seawall. It would end at San Luis Pass.
At the entrance to Galveston Bay, a system of storm surge gates would be constructed to protect the coastline during storm events but otherwise allow for navigation to the ports of Galveston, Texas City and Houston. A large navigation gate would also be placed along the ship channel. These gates are modeled after similar structures in London on the River Thames and on the coast of the Netherlands.
A “ring levee” would also be placed around Galveston to protect the bayside of the island, a densely populated area, from surge and flood waters. Gates and other barriers would be built near Clear Creek as well as Dickinson, Offatts and Highland bayous.
The plan also includes beach and dune restoration along the lower Texas coast, and nine ecosystem restoration projects to increase resilience.
Bill Merrell, a Texas A&M University Galveston professor who proposed the Ike Dike concept more than nine years ago, noted some minor differences between his original plan and the one backed by the two agencies.
Merrell’s plan included a gate at San Luis Pass, which is south of Galveston, and a mix of gray and green infrastructure along the coast, most notably a series of 17-foot high dunes on Bolivar Peninsula and Galveston in lieu of a seawall. Built after the catastrophic 1900 Galveston hurricane, the 17-foot-high seawall spared the island from many storms but was overtopped by Ike’s storm surge and waves.
He also did not include any protection for High Island, nor a ring levee around Galveston, which he called an “extreme” measure that would require a sophisticated pumping system in the event of heavy rains.
“It’s a fishbowl effect. You have to pump it, and if your pumps work, you’re happy, and if your pumps don’t work, you drown,” Merrell said. “You’d have to pour a lot of maintenance money into it.”
Burks-Copes said that dunes and beach nourishment are “still in play” as options for Galveston and Bolivar Peninsula as opposed to a more hardened barrier.
See here for the background, here for the four alternatives that were under consideration, here for the plan that was chosen, and here for the related documents for public review. I just want to stress that the federal government absolutely, 100%, no questions asked can afford this. We may need to chisel back a tiny portion of the massive giveaway to the rich known as the Trump tax cuts to make us feel like we can afford it, but we can afford it. What we can’t afford is to do nothing.