1. Professor, Civil Engineering Dept., Colorado State Univ., Fort Collins, CO 80523.
2. Graduate Research Assistant, Civil Engineering Dept., Colorado State Univ., Fort Collins, CO 80523.
3. Irrigation Specialist, Colorado State Univ., Cooperate Extension, P.O. Box 190, Rocky Ford, CO 81067.
4. Associate Professor, Civil Engineering Dept., Colorado State Univ., Fort Collins, CO 80523.