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 competencies and with regard for appropriate balance.

This report has been reviewed by a group other than the authors according to procedures approved by a Report Review Committee consisting of members of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine.

Support for this project was provided by the Bureau of Reclamation Grant No. 1-FG-81-18250, U.S. Environmental Protection Agency Grant No. CX-818588-01-0, West Basin Municipal Water District, Water Replenishment District of Southern California, Orange County Water District, and National Water Research Institute.

Library of Congress Catalog Card No. 94-66774

International Standard Book Number 0-309-05142-8

Additional copies of this report are available from:
National Academy Press
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B-463

Copyright 1994 by the National Academy of Sciences. All rights reserved.

Original cover art by Marilyn Kirkman, Arati Artists Gallery, Colorado Springs, Colorado

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