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x ACKNOWLEDGMENTS This work was sponsored by the American Association of State Highway and Transportation Officials, in cooperation with the Federal Highway Administration (FHWA), and was conducted through the National Cooperative Highway Research Program (NCHRP), which is administered by the Transportation Research Board (TRB) of the National Research Council (NRC). The research reported herein was performed under NCHRP Project 24-16 by Ayres Associates, Fort Collins, Colorado. Dr. P.F. Lagasse, Senior Vice President, served as Principal Investigator and Dr. S.A. Schumm, Senior Associate, served as Co-Principal Investigator. They were assisted by Dr. L.W. Zevenbergen, Manager River Engineering, Mr. W.J. Spitz, Geomorphologist, and Dr. D.W. Zachmann, Senior Associate. The advice of Dr. J.C. Brice (formerly USGS) in providing background and explanation of his earlier work for the Research Team, and the assistance of Dr. R. Copeland, U.S. Army Corps of Engineers, Engineering Research and Development Center in providing access to the original Brice data and sharing field data acquired by the USACE at Brice sites are gratefully acknowledged. Dr. S.A. Schumm contributed to the initial literature survey and his broad experience with the morphology of meandering rivers influenced the direction taken in this research at the outset of the project. Dr. C.R. Thorne's (University of Nottingham, United Kingdom) extensive review of the literature which related the literature on the meandering process to the objectives of this research is specifically acknowledged. Dr. J.L. Briaud, Texas A&M University, provided advice on geotechnical issues over the course of the project and Mr. F.J. Halfen, Vice President for Photogrammetry, Ayres Associates reviewed the photogrammetric applications of the research. A special acknowledgment is made to the State DOTs of Alabama, Alaska, California, Maryland, Nevada, Wyoming, and the City of Austin, Texas who participated in the Task 8 Beta test of the Handbook and methodology and whose comments led to improvements in both. Mr. J. McConahy of Ayres Associates, Mr. D. Thomas of Mussetter Engineering, Inc. (MEI), and Ms. K. Brennan of the University of Nottingham participated in the internal testing (Task 6) and provided valuable comments on the Handbook and methodology. Dr. C.R. Thorne (United Kingdom) and Dr. R.A. Mussetter (MEI) also reviewed and commented on the Handbook. The authors would also like to thank Dr. S.A. Schumm (Ayres Associates), Dr. Gary Parker (St. Anthony Falls Hydraulic Laboratory), Mussetter Engineering, Inc., Dr. A.J. Odgaard (Iowa Institute of Hydraulic Research), and Mr. Amir Soltani (Nevada Department of Transportation) for contributing additional data for several sites included in the data base. The participation, advice, and support of NCHRP Panel members throughout this project are gratefully acknowledged.