This handbook has been prepared by leading international experts adressing special aspects of water resources management and water pollution control.A series of case studies from various regions is also included, highlighting successful models of wastewater management and pollution control from different parts of the world. This is a handbook for policy makers and environmental managers in water authorities and engineering companies engaged in water quality programmes,especially in developing countries.It is also suitable for use as a textbook or as training material for water quality management course.