Suitable for courses in water/wastewater treatment and environmental engineering this text provides an introduction to the design of water and wastewater treatment systems. This edition has been revised to incorporate recent improvements in the understanding of fundamental phenomena, applications of new technologies and materials, and new computational techniques. It focuses on designing treatment, distribution, and collection systems that work and includes coverage of factors involved in cost analysis, stressing the importance of economics in engineering design. Changes to this edition an expanded treatment of important theoretical and practical aspects of hydraulics, including control and measurement;modern treatment of urban hydrology and storm water control;an emphasis on the inter-relationship of environmental problems.