About the Author: Larry W. Mays, Ph.D., P.E., P.H., D. WRE, is Professor of Civil and Environmental Engineering at Arizona State University, and former chair of the department. He was formerly Director of the Center for Research in Water Resources at the University of Texas at Austin, where he held an Engineering Foundation--endowed professorship. A registered professional engineer in several states, and a registered professional hydrologist, he has served as a consultant to many organizations. Professor Mays is the author of Water Resources Engineering (published by John Wiley & Sons, Inc.) and Optimal Control of Hydrosystems (published by Marcel Dekker), and co-author of Applied Hydrology and Hydrosystems Engineering and Management (both from McGraw-Hill)and Groundwater Hydrology (published by John Wiley & Sons, Inc). He was editor-in-chief of Water Resources Handbook, Water Distribution Systems Handbook, Urban Water Supply Management Tools, Stormwater Collection Systems Design Handbook, Urban Water Supply Handbook, Urban Stormwater Management Tools, Hydraulic Design Handbook, and Water Supply Systems Security, and Water Resources Sustainability, all published by McGraw-Hill. In addition, he is editor-in-chief of Reliability Analysis of Water Distribution Systems and co-editor of Computer Methods of Free Surface and Pressurized Flow. Professor Mays' most recent book is Urban Water Management in Arid and Semi-arid Regions, published by Taylor and Francis. This book was the result of volunteer work for the United Nations UNESCO-IHP in Paris. Professor Mays has published extensively in refereed journal publications and papers in the proceedings of national and international conferences, many of which were invited papers, and many invited chapters in books that he did not author or edit. Among his honors is a distinguished alumnus award from the University of Illinois at Champaign-Urbana and he is a Diplomate, Water Resources Engineering of the American Academy of Water Resources Engineering. He is also a Fellow of the American Society of Civil Engineers and the International Water Resources Association. Professor Mays lives in Mesa, Arizona and Pagosa Springs, Colorado.