Not really more information about that, per se, but if you have ever seen Ken Burns' documentary on the Great Dustbowl it is interleaved with a lot of really fa

Not really more information about that, per se, but if you have ever seen Ken Burns' documentary on the Great Dustbowl it is interleaved with a lot of really fascinating things about how groundwater/water effects the overall affluence and economy of America as a whole - enough to cause Great Depressions and so forth. At the end, if memory serves, they discuss the Oglala aquifer and how it is at currently dangerous levels that could potentially cause another Dustbowl/Great-Depression like chain of events.