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COMMISSION INTERNATIONALE DES GRANDS BARRAGES ----------------------------------------------------------------------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ----------------------------------------------------------------------- DOI 10.3217/978-3-85125-620-8-007 This work licensed under a Creative Commons Attribution 4.0 International License. https://creativecommons.org/licenses/by-nc-nd/4.0/ WHAT HAPPENED AT OROVILLE DAM AND WHY – FINDINGS OF THE SPILLWAY INCIDENT FORENSIC INVESTIGATION John W. FRANCE Managing Member, JWF CONSULTING LLC, USA Irfan A. ALVI President & Chief Engineer, ALVI ASSOCIATES, INC., USA Peter A. DICKSON Geotechnical Practice Leader, STANTEC CONSULTING SERVICES, INC., USA Henry T. FALVEY President, HENRY T. FALVEY & ASSOCIATES, INC., USA Stephen J. RIGBEY Director, SJR CONSULTING, CANADA John TROJANOWSKI President, TROJANOWSKI DAM ENGINEERING, LIMITED, USA UNITED STATES OF AMERICA 145