Why does this worry me?

From nola.com:

A key function of those overlapping communications grids will be to monitor water levels, making sure they don't exceed the "safe" level established for each channel: a maximum 6 feet of surge at the 17th Street Canal, 4 feet at London and 8 feet at Orleans.

Depth is a critical consideration. Flow rate is another. When the gates are closed, the huge pumps nearer the city's heart must not outpace the smaller temporary pumps the corps is installing to move water from the canal mouths out into Lake Pontchartrain. The canal floodwalls might not tolerate the pressure of water churning for hours on end, engineers said. (emphasis mine)

Probably because I believe Matt McBride over the ACoE. What's Matt got to hide?