1000gpm pumps are low end of specific gravity pumps.
I suspect larger by a couple orders of magnitude would be nice.
I helped pump out a pond years ago with a 100 horse tractor and a 500 gal/minute pump. I imagine with the volumes involved here, that would be equivalent to urinating in the ocean in terms of effect. What kind of numbers are required for something like this?
I wasn't really wondering what would be nice, I was really wondering what the capacity of the pumps in NO were (that could easily be replaced by mining pumps from somewhere).