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REVIEW OF USGCRP PLAN FOR A NEW SCIENCE INITIATIVE ON THE GLOBAL WATER CYCLE Committee on a Review of A Plan for a New Science Initiative on the Global Water Cycle Water Science and Technology Board Board on Atmospheric Sciences and Climate Division on Earth and Life Studies National Research Council National Academy Press Washington, D.C. i NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance. Support for this project was provided by the Army Research Office, National Aeronautics and Space Administration under Grant No. NAG58651, National Oceanic and Atmospheric Administration, National Science Foundation under Grant No. EAR-9986796, National Weather Service, U.S. Environmental Protection Agency under Grant No. X2895301, and U.S. Geological Survey. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the sponsors. International Standard Book Number 0-309-08406-7 Available from the National Academy Press, 2101 Constitution Avenue, N.W., Washington, DC 20418, (800) 624-6242 or (202) 334-3313 (in the Washington metropolitan area); internet . Copyright 2002 by the National Academy of Sciences. All rights reserved. Printed in the United States of America ii The National Academy of Sciences is a private, nonprofit, self-perpetuating society of distinguished scholars engaged in scientific and engineering research, dedicated to the furtherance of science and technology and to their use for the general welfare. Upon the authority of the charter granted to it by the Congress in 1863, the Academy has a mandate that requires it to advise the federal government on scientific and technical matters. Dr. Bruce M. Alberts is president of the National Academy of Sciences. The National Academy of Engineering was established in 1964, under the charter of the National Academy of Sciences, as a parallel organization of outstanding engineers. It is autonomous in its administration and in the selection of its members, sharing with the National Academy of Sciences the responsibility for advising the federal government. The National Academy of Engineering also sponsors engineering programs aimed at meeting national needs, encourages education and research, and recognizes the superior achievement of engineers. Dr. Wm. A. Wulf is president of the National Academy of Engineering. The Institute of Medicine was established in 1970 by the National Academy of Sciences to secure the services of eminent members of appropriate professions in the examination of policy matters pertaining to the health of the public. The Institute acts under the responsibility given to the National Academy of Sciences by its congressional charter to be an adviser to the federal government and, upon its own initiative, to identify issues of medical care, research, and education. Dr. Kenneth I. Shine is president of the Institute of Medicine. The National Research Council was organized by the National Academy of Sciences in 1916 to associate the broad community of science and technology with the Academy’s purposes of furthering knowledge and advising the federal government. Functioning in accordance with general policies determined by the Academy, the Council has become the principal operating agency of both the National Academy of Sciences and the National Academy of Engineering in providing services to the government, the public, and the scientific and engineering communities. The Council is administered jointly b