Member United States nat. committee irrigation, drainage and flood control International Commision on Irrigation and Drainage, from 1961. Member various advisory groups National Academy Science, 1967-1977. Member United States advising committee International Institute Applied Systems Analysis subcommittee on water resources, 1974-1981.
Member of advisory panel to unites states department Interior Water Resources Science Information Center, 1968-1972. Fellow American Academy Mechanics (founding. Member of New York Academy Sciences, Korean Association Hydrological Science (honorary), American Society Engineering Education (Western Electric Fund award 1974, Vincent Bendix award, 1977), American Society of Civil Engineers (Research prize 1962), International Association Hydraulic Research, International Association for Hydrological Sciences (United States committee International Union Geodesy and Geophysics subcommittee 1973-1981), National Academy Engineering (member panel natural hazards and disasters, 1972, commission on remote sensing for development 1975-1977), Academia Sinica (academician), Sigma Xi, Phi TAu Phi (president Mid-American chapter), Phi Kappa Phi, Phi Kappa Epsilon, Chi Epsilon (honorary faculty.