ACKNOWLEDGEMENTS

This project was supported as part of the National Science Foundation initiative to study Human Dimensions of Global Change; grants #SES-9122524 and #SES-9122129. In addition, the author wishes to thank the Salt River Project, the National Severe Storms Laboratory, the personnel of the Office of Climatology, the Department of Geography at Arizona State University, and the U.S.D.A. Water Conservation Laboratory, Phoenix, AZ for support of this project.