Commenting on the USACE Circular, FOSA Chairman Mike Hines said, “FOSA appreciates the Corps of Engineers’ Levee Safety Program’s focus on monitoring and managing flood risks associated with levees. Given the dynamic nature of flood risk, this Circular establishes an appropriate framework.”
For remote borders with little or no infrastructure, there are various techniques that can keep an eye, or rather an ear, out. QinetiQ, a British firm, has a system called OptaSense, which uses a fiber-optic cable laid in the ground. Sound from above creates vibrations in this cable.