There’s more than one way to mitigate against flooding, and it may be best to adopt more than one of them.
For about a decade, two of Texas’ top universities have pushed dueling plans to protect the Houston-Galveston region from hurricanes.
A concept championed by Texas A&M University at Galveston appears to be winning out as the federal and state governments pursue a plan similar to one proposed by A&M oceanographer Bill Merrell in early 2009, months after Hurricane Ike smashed ashore at Galveston Island.
But that project by the U.S. Army Corps of Engineers and the Texas General Land Office, which calls for the installation of beachfront sand dunes and massive storm surge barrier gates, won’t become reality for at least 15 years — and probably much longer. That leaves plenty of time for a worst-case hurricane to devastate the densely populated, highly industrialized region — a reality that’s coming into sharper focus as sea levels rise and the ocean warms.
The so-called coastal barrier system also carries a significant price tag — as much as $20 billion — and a significant part of the system may guard against only a modest 100-year storm.
In the meantime, Rice University is pushing a plan that it says could become a reality faster and more cheaply than the coastal barrier system. While the Galveston Bay Park Plan isn’t designed to protect as much land as the coastal barrier system, the chief spokesperson for the university’s Severe Storm Prediction, Education and Evacuation from Disasters Center — known as SSPEED — says it would offer a significantly higher level of protection than the coastal barrier system for the most populated and industrialized areas in Houston and Galveston.
The park plan, conceived in 2015, calls for the use of clay dredged from the Houston Ship Channel, where a $1 billion deepening and widening project is in the works to accommodate more and larger ships, to create a 25-foot-tall levee along the shipping lane, which is the nation’s busiest. Additional dredged material would be piled behind it to form parkland. The dike would connect to an existing levee at Texas City, which would be raised to 25 feet from 17 feet.
A significant amount of dredged material has already been disposed of along the channel, forming marshy islands and a wildlife management area. That means it would not have to be built entirely from scratch.
A large storm surge gate — much like ones called for in the coastal barrier system — also would be installed and would be closed only when big storms threatened the area. Like the coastal barrier system, the park plan also calls for a “ring” levee around the city of Galveston to protect it from incoming and outgoing storm surges, the deadliest effects of hurricanes. The new north-south levee, which would cut through Galveston Bay, would be punctuated by smaller gates to allow boats to pass through.
See here for some background on the SSPEED plan, and here for more on the plan that has been selected as the preferred plan by the U.S. Army Corps of Engineers. The SSPEED alternative is touted by Jim Blackburn, who has been a critic of the Corps’ Ike Dike study. Blackburn says this plan could be done as early as 2027 for $3 billion to $6 billion, which means it could be locally funded; that would also speed up the process, as it would not need to go through so much federal review. It could also be done as a complement to the Ike Dike. The Corps disputes SSPEED’s cost estimate and argues their plan would have a significant environmental impact. I’m not qualified to sort that out, but I do like the idea of having a more nimble plan in place that could get some mitigation going right now, rather than a decade or more from now. Read the story and see what you think.