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<br />FOREWORD <br /> <br />Paul C. Summers,l M. ASCE <br />Conrad G. Keyes, /r.,2 F. ASCE <br /> <br />Traditionally, water resources development pertains to building dams <br />and reservoirs, installing pipelines or using concrete to line ditches or <br />canals, or in some way storing or distributing the available water. In <br />many cases, however, there is only one means to increase water supplies, <br />and that is to develop atmospheric water. In many areas of the United <br />States and the world, there is a need for new water supplies. In many of <br />these areas, cloud seeding technology can be useful. <br />These updated guidelines are intended to provide water resources <br />managers and others with information and references that they will need <br />to make a decision on the use of cloud seeding to augment available <br />water supplies. <br />The manual incorporates pertinent background on the science and prac- <br />tice of weather modification by cloud seeding. Economic, environmental, <br />social and legal factors motivating and limiting operational cloud seeding <br />are reviewed. The technologies, instrumentation and procedures needed <br />to implement a cloud seeding program are described. This is all intended <br />to give the water resources manager the broad spectrum and the practical <br />details of what is involved in utilizing the cloud seeding technology. <br /> <br />IPrincipal Engineer, James M. Montgomery, Consulting Engineers, Incorpo- <br />rated, 4525 South Wasatch Boulevard, Suite 200, Salt Lake City, UT 84124. <br />2Princ:ipal Engineer, Planning, United States Section, International Boundary <br />and Water Commission, United States and Mexico, Building C-31O, 4171 North <br />Mesa Street, EI Paso, Texas 79902-1441. <br /> <br />xv <br />