Here's one paper
Originally Posted by sony2000
I would like to see a study on how much more water over the years is being sent from the Great Lakes south, to feed the farmers of the Midwest and even California.
which attempts to survey the existing diversions. The most significant diversion is the Chicago one, sending water to the Mississippi system. To my knowledge there are no direct diversions to places as far away as California ... at least not yet. But the pressure to do so is growing.