Acknowledgments

I deeply appreciate the thorough and very useful reviews of this book by the following individuals:

• Leonard F. Konikow – Emeritus Scientist, U.S. Geological Survey, USA
• Jack Sharp – Dave P. Carlton Professor of Geology, University of Texas, Austin, USA
• Jim Butler – Senior Scientist and geohydrologist, Kansas Geological Survey, USA
• Roberto Kirchheim – Hydrogeology Researcher, National Geological Survey of Brazil
• Wolfgang Kinzelbach – Emeritus professor ETH, Zürich, Switzerland
• Everton De Oliveira – President of Hidroplan, Director of the Sustainable Water Institute, Brazil
• Garth van der Kamp – Research Associate, Global Institute for Water Security, University of Saskatchewan, Saskatoon, Saskatchewan, Canada (Formerly, Research Scientist, Environment Canada)
• Hugh Whiteley – Independent Civil Engineering Professional and Emeritus Adjunct Professor, University of Guelph, Kitchener, Canada
• Ineke Kalwij – President, Principal Hydrogeologist, Kalwij Water Dynamics Inc., Canada
• Matthys Dippenaar – Associate Professor, Engineering Geology and Hydrogeology, University of Pretoria, South Africa

The comments and suggestions provided by each of these reviewers on the first draft of the book were very helpful to me in my endeavors to improve it. They focused on numerous aspects: overall scope of the book and observed gaps; relevance of the topics covered from a didactic point of view; errors and flaws concerning content; usefulness and quality of the graphs; uncertainty and how it is reflected in the text and presented statistics; terminology; shared knowledge and references to additional useful literature; flaws in presentation and suggestions for improvement; linguistic errors and their correction; and more. Especially the first three reviewers of the list made exceptional efforts and delivered very detailed reviews. My sincere thanks go to all reviewers.

I am grateful to Amanda Sills, Juliana Apolonio, Danilo Amendola of the Groundwater Project for their oversight and copyediting of this book, to Daniel Noble for skillfully drafting the world map of large aquifers, and to Mohammad Shamsudduha for his excellent graphs of GRACE groundwater storage anomalies. I thank Eileen Poeter (Colorado School of Mines, Golden, Colorado, USA) for reviewing, editing, and producing this book.