This work was supported by the U.S. Agency for International Development through a TIES fellowship awarded to the first author, whose studies at Michigan Technological University were made possible through international programs at the University of Sonora. Data were provided by the Mexican Institute of Water Technology (IMTA) and National Commission of Water (CNA). Comments and suggestions made by A. Maclean, A. Mayer, and B. Barkdoll of Michigan Technological University are appreciated, as is the assistance of R. Nikolov at North Carolina State University—Fayetteville. The constructive comments of three anonymous reviewers helped to improve this paper considerably, but any errors or omissions are the sole responsibility of the authors.
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