Well, the effectiveness is limited in New Orleans because the lake and river aren't connected very well, and they're at different elevations. A direct route might be possible via the Industrial Canal, but the locks there are ancient and tiny. They need to build some new locks, and the 9th Ward people need to stop bitching.
It's too bad we got rid of the New Basin Canal... boat service directly from Mandeville to the Superdome in 40 minutes.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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