Standard Practice for the Design and Operation of Precipitation Enhancement Projects provides state-of-the-art cloud seeding technology applications for precipitation enhancement projects. By utilizing a variety of meteorological and hydrological observations, water resources engineers can evaluate the effectiveness of improving precipitation methods. Subjects discussed in this publication include the history and status of cloud seeding and the concepts, designs, operations, and evaluation of these projects. Natural cloud processes, with an emphasis on artificial intervention through cloud seeding, are discussed. These processes can potentially increase the chances of precipitation reaching the ground. Operational requirements and procedures such as personnel, decision-making, communications, safety issues and seeding suspension criteria are included. Topics covered include: Definition of project scope; Targeting and delivery methods; Seeding agent selection and equipment considerations; Data collection and instrumentation; Legal issues and environmental concerns; and Evaluation of effects of cloud seeding.