1. Hydrologic Research Laboratory, Department of Civil and Environmental Engineering, University of California, Davis. One Shields Avenue, Davis, California 95616, USA
2. Present address: Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
3. J. Amorocho Hydraulics Laboratory, Department of Civil and Environmental Engineering, University of California, Davis. One Shields Avenue, Davis, California 95616, USA
4. Korea Institute of Water and Environment, Korea Water Resources Corporation, Daejeon 305-730, South Korea
5. Civil and Architectural Engineering, University of Wyoming, Laramie, WY 82071, USA
6. Bay Delta Office, California Department of Water Resources, Sacramento, California 95814, USA
7. Department of Environmental Engineering, Toyama Prefectural University, Toyama 939-0398, Japan