Preprinted Proceedings of the 4Th International Conference on River Basin Management., Location: Sao Paolo, Braz, Sponsors: Dep of Water & Electric Power, Braz;Natl Dep of Water & Electric Power, Braz;Univ of Sao Paulo, Polytechnic Sch, Sao Paulo, Braz;Basic Sanitation Co of the State of Sao Paulo, Braz