1. Professor of Water Engineering, Urban Water Research Group, Dept. of Civil and Environmental Engineering, Imperial College of Science, Technology and Medicine, Imperial College Road, London SW7 2BU, UK.
2. Principal Engineer, Water Management Dept. HR Wallingford, Oxfordshire OX10 8BA, UK.
3. Chief Hydraulics Engineer, Binnie Black and Veatch, 69 London Rd., Redhill, Surrey RH1 1LQ, UK.