1. Hydrologic Research Laboratory, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, CA 95616.
2. California Dept. of Water Resources, Sacramento, CA.
3. Civil Engineering Faculty, Istanbul Technical Univ., Istanbul, Turkey.
4. Public Works Research Institute, 1-6, Minamihara, Tsukuba, Ibaraki 306-8516, Japan.