In 1979 I worked on the archaeology of the Tennessee-Tombigbee Barge Canal running from NE Mississippi into Alabama and Mobile Bay on the Gulf of Mexico. As I recall it was a choice between it and an "energy island" for NYC in the US Congress. In retrospect I wonder if the money might have been better spent in the central drainages. Believe it or not I can dump a cup of water in the Allegheny River in western New York State and have it flow out above the streets of New Orleans in Louisiana. That's some drainage!