http://www.iitap.iastate.edu/gccourse/issues/society/ogallala/ogallala.html

The most recent High Planes-Ogallala Aquifer Regional Resources study was sponsored by the US Department of Commerce (DOC) and was released in mid-1982. It treated climate as a given, and a favorable given at that. Nowhere in the study is climate variability or climate change mentioned. The DOC assessment was completed at a time when there was considerable discussion about the prospects for a global climate change and a possible increase in climate variability. It is interesting that considerations of either climate variability or climate change were absent from the multimillion-dollar report as well as from most reviews of it. The study focused on water balance in the region and on the economics associated with dwindling groundwater supplies. Asided from other problems with the study the lack of consideration of climate (other that that it would continue to be benign) makes its projections regarding possible future scenarios about, for example, agricultural production costs, less than useful.

This is also somewhat out of date...but...