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"Groundwater Studies: An International Guide for Hydrogeological Investigations", edited by V. S. Kovalevsky, G. P. Kruseman, K. R. Rushton (IHP-VI, SERIES ON GROUNDWATER NO.3). The designations employed and the presentation of material throughout the publication do not imply the expression of any opinion on the part of UNESCO concerning the legal status of any country or area or its authorities, or the delineation of its frontiers or boundaries. Published in 2004 by the United Nations Educational, Scientific and Cultural Organization (7, place de Fontenoy, 75352 Paris 07 SP). Layout and typesetting by Marina Rubio (93200 Saint-Denis). ISBN 92-9220-005-4. © UNESCO 2004. Preface: Understanding of groundwater has developed significantly since 1972 when the first part of the original volume of Groundwater Studies was published by UNESCO. Yet, for someone just commencing the study of groundwater, there is still a need for a text which will help in starting their work. For those with greater experience in hydrogeological investigations, there is a need to increase awareness both of more recent work and information about techniques outside their previous experience. This new volume is intended to meet both of these needs and therefore it has the subtitle An International Guide for Hydrogeological Investigations. This document was prepared in the framework of the Fourth Phase of the International Programme as Project M-1-3 that was supervised and directed by Habib Zebidi, Water Science Specialist, Division of Water Sciences, UNESCO. After his retirement in 1999, it was continued by his successor Ms Alice Aureli. Dr Habib Zebidi drew contributors and members for an editing committee from different countries. They brought to this volume their own distinctive perspectives as all are acknowledged experts with extensive experience of practical groundwater issues. The members of the editing committee provided a certain unity of style and presentation, and also tried to keep the size of this document in hand. Each chapter is intended to provide sufficient information to comprehend the fundamentals of the topic; in addition, reference is made to publications where further information can be obtained for more detailed study. The contributing authors are listed below per chapter and details are given in Appendix A-3: Chapter 1: Ken R. Rushton (United Kingdom) and Gideon P. Kruseman (The Netherlands) Chapter 2: Jasper Griffioen (The Netherlands) Chapter 3: Henny A. J. van Lanen (The Netherlands) Chapter 4: Frank D. I. Hodgson (South Africa) Chapter 5: Robert Becht (The Netherlands) Chapter 6: Robert Sporry (The Netherlands) Chapter 7: Aldo da C. Rebouças (Brazil) Chapter 8: Jasper Griffioen (The Netherlands) and Gideon P. Kruseman (The Netherlands) Chapter 9: P. K. Aggarwal (Austria), K. Froehlich (Austria), K. M. Kulkarni (India), E. Garcia-Agudo (Austria) Chapter 10: Jean Margat (France) Chapter 11: Ken R. Rushton (United Kingdom) and Vladimir S. Kovalevsky (Russia) Chapter 12: Jean Margat (France) Chapter 13: Vladimir S. Kovalevsky (Russia) and J. Vrba (Czech Republic) Chapter 14: Philip E. LaMoreaux (United States of America) and Yuan Daoxian (China) Chapter 15: S. D. Limaye (India) Chapter 16: Emilio Custodio (Spain) Acknowledgements: The contributing authors and the editing committee like to thank the UNESCO Division of Water Science for their patience, advice, and support during the long preparation of this document. The editors are very grateful to Dr H. Speelman, Director of TNO Netherlands Institute of Applied Geosciences, for processing the figures, funding the correction of the text on the proper use of the English language, and making funds available to assist G. P. Kruseman in his editing work. 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