the dam is still the biggest threat for a big catastrophic failure. that dam hadn t been updated since the 1980s. during the course of the hurricane, the output pipes jammed, which was one problem. you had a tremendous amount of water coming into the reservoir. you had all the water that went over the spill way. it is supposed to do that but it had never handled this kind of volume before. such a volume of water came through so fast and the spillway itself had some structural issues and it undermined and ripped out the bottom half of the spill way and erode that back into the bottom of the dam. the foundation of that spillway is pretty much sand. if it erodes to the dam you could talk about a failure of the dam that would flood the hundreds of families down below. what the navy pilots and marines on the ground are doing are hooking up the jersey barriers to a helicopter and they drop it at the foot of