When levees fail

Terra Daily: …. How then can we limit trouble when a levee breaches or, better yet, prevent such a break from ever happening again" "Any solution will be difficult and challenging," says Wil Laska, who manages the Levee Strengthening and Damage Mitigation Project at Homeland Security's Science and Technology (S and T) Directorate. "But first, we've got to ensure that all the levees in the United States are solid, built correctly and well. We also have to make sure that all repairs are attended to on a rigorously timed basis. No ifs, ands, or buts."

The levee project is a comprehensive one, spanning four years and operating in three phases. In the first phase, researchers will identify potential technologies and procedures that can rapidly and affordably indicate problem locations along a levee, strengthen these existing areas, provide innovative designs for new levees, and repair any breaches… When considering the country's levee system, however, there's another issue at play here besides horrendous storms. We are witnessing the slow death of our natural buffer zones - which protect us from powerful sea surges. River basins, deltas, and savannahs are being congested with soil and debris. Human development and our residual waste is causing the surrounding land to sink, and as salt water rushes in, thick expanses of wetland, mangroves, trees and grasses are poisoned.…

Laska is taking on this problem too. The project also aims to develop approaches and technologies that will duplicate the effect of marshland and reduce the strength of surges. Solutions being considered include: inflatable and drop-in structures that last just long enough to prevent severe damage; fast-growing vegetation to rapidly imitate the effect of marshlands in lowering tides; and ways to reroute flood waters and flood-proof critical infrastructure.

Laska is part of a small group of experts focused on DHS's Science and Technology Directorate projects called Homeland Innovative Prototypical Solutions, or HIPS. These projects are designed to deliver prototype-level demonstrations of potential game-changing technologies in two to five years. They come with a moderate-to-high risk of failure, but they can also yield a high payoff if successful.

"All of these goals are enormously ambitious, but that's the nature of the work," he says. "Right now, the S and T Directorate is looking at just about any decent idea."