1. Water Resources Engineer, Herrera Environmental Consultants, Seattle, WA 98121 (corresponding author).
2. Program Manager, Scripps Institution of Oceanography, Univ. of California San Diego, La Jolla, CA 92092-0224; and Research Scientist, CIRES, Univ. of Colorado, Boulder, CO 80309-0216.
3. Director, National Drought Mitigation Center, Univ. of Nebraska-Lincoln, Lincoln, NE 68583-0988.