Using 1/4th the entire freshwater inflow into the Chesapeake Bay makes it sound enormous. That's multiple major rivers for a bit over 30 million people.

I live near the Potomac and always figured the region was wet enough that water was not a concern. You have me rethinking that somewhat.

Where does your gasoline come from? Most of that usage is for the massive Exxon/etc facilities we have in Houston/Galveston to refine most of the fuel the entire nation uses.