Understood, I don't think the canals are very deep.
On a related note, how to you clean a water supply system that has been compromised as New Orleans' has?
That is way beyond my pay grade. But I will say that mother earth has been a self-cleaning organism for millions of years - according to the Darwinists. LOL!
It seems that the sobsisters with microphones have moved on to threats of contamination, since other threats are more under control.
Think about Love Canal and then question how anyone should be living in that spot again... I don't think they could bring in enough new soil to make it safe. As it is that area has a huge cancer rate.