1. President, Riverside Technology, Inc., Fort Collins, CO 80528.
2. Professor, Dept. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, CO 80523 (corresponding author).
3. Professor, Dept. of Atmospheric Science, Colorado State Univ., Fort Collins, CO 80523.
4. Director, Colorado Water Institute, Colorado State Univ., Fort Collins, CO 80523.