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ABSTRACT This manual of professional practice, Guidelines for Cloud Seeding to Augment Precipitation (ASCE Manual No. 81), is the outgrowth of a committee report by the same title published by the ASCE Weather Modification Committee in the March 1983 issue of Journal of Irrigation and Drainage Engineering. A task com- mittee of the ASCE Climate and Weather Change Committee has expanded and updated this report to provide water resources managers and others who might become involved in the decision-making process for implementing a cloud seed- ing project with the necessary guidelines. The sections of this manual cover essentials of weather modification including the social, legal, environmental, and economic aspects as well as the scientific basis. Further, the manager is guided through the professional practice for operational cloud seeding, from materials and devices necessary to produce ice crystal-forming nuclei to the methods for distributing the artificially produced nuclei through cloud masses. In addition, methods of instrumentation that are used to provide input to real-time decisions and evaluate results are discussed. Finally, this manual outlines the steps that must be taken to implement a cloud seeding project. A glossary of terms is appended. Library of Congress Cataloging-in-Publication Data Guidelines for cloud seeding to augment precipitation I by the Committees on Weather Modification and Climate and Weather Change of the Irrigation and Drainage Division, American Society for Civil Engineers (ASCE); editors, Archie M. Kahan...[et al.]. p. cm. - (ASCE manuals and reports on engineering practice; no. 81) Includes index. ISBN 0-7844-0061-X 1. Rain-making-United States-Handbooks, manuals, etc. 2. Precipitation (Meteorolo~y)-Modification-United States-Handbooks, man uals, etc. I. Kahan, Archie M., 1917- . II. American Society of Civil Engineers. Irrigation and Drainage Division. Committee on Weather Modification. III. American Society of Civil Engineers. Irrigation and Drainage Division. Committee on Climate and Weather Change. IV. Series. aC928.7.G85 1995 95-7109 551.6'876-dc20 CIP J~! The material presented in this publication has been prepared in accordance with generally recognized engineering principles and practices, and is for gener- al information only. This information should not be used without first securing competent advice with respect to its suitability for any general or specific applica- tion. The contents of this publication are not intended to be and should not be construed to be a standard of the American Society of Civil Engineers (ASCE) and are not intended for use as a reference in purchase specifications, con- tracts, regulations, statutes, or any other legal document. No reference made in this publication to any specific method, product, process or service constitutes or implies an endorsement, recommendation, or warranty thereof by ASCE. ASCE makes no representation or warranty of any kind, whether express or implied, concerning the accuracy, completeness, suitability or utility of any information, apparatus, product, orprocess discussed in this publication, and assumes no liability therefor. Anyone utilizing this information assumes all liability arising from such use, including but not limited to infringement of any patent or patents. Photocopies. Authorization to photocopy material for internal or personal use under circumstances not falling within the fair use provisions of the Copyright Act is granted by ASCE to libraries and other users registered with the Copyright Clearance Center (CCC) Transactional Reporting Service, provided that the base fee of $2.00 per article plus $.25 per page copied is paid directly to CCC, 222 Rosewood Drive, Danvers, MA 01923. The identification for ASCE Books is 0-7844-0061-X/95 $2.00 + $.25. Requests for special permission or bulk copying should be addressed to Permissions & Copyright Dept., ASCE. Copyright @ 1995 by the American Society of Civil Engineers, All Rights Reserved. Library of Congress Catalog Card No: 95-7109 ISBN D-7844-0061-X Manufactured in the United States of America. ;' I 1 .j ';.1 ('I '3i.