1. Senior Research Engineer, IIHR-Hydroscience and Engineering, Univ. of Iowa, Iowa City, IA 52242.
2. Associate Professor, IIHR-Hydroscience and Engineering, Univ. of Iowa, Iowa City, IA 52242.
3. Professor and Director, IIHR-Hydroscience and Engineering, Univ. of Iowa, Iowa City, IA 52242.