fortunately downstream is the ocean. the sediment issue on the farmland, that's the one that we're not sure about, but there are a few hundred thousand people living in the floodplain and fewer people get fed off that farmland (which hasn't been doing great in the last 70 years since... well that's a history lesson and a farming lesson. long story short, if people have been doing something for a very, very long time, it's worth thinking about the consequences a long time before you change it. but since they already did, you kind of have to play the hand you're dealt, not the hand that was dealt twenty years ago.