Prof. Bart Schultz, Emeritus Professor of Land and Water Development, UNESCO-IHE Institute for Water Education. Address: P.O. Box 3015, 2601 DA Delft, THE NETHERLANDS. Phone: +31 15 2151734, home: +31 320 222775, E-mail:b.schultz@unesco-ihe.org
Prof. Gamal Abdo, Director of Water Research Centre, Universityof Khartoum. Address: P.O. Box 231, 11111 Khartoum, Sudan.Phone:+249122123825, E-mail: gabdo2000@yahoo.com
