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Water and Power also published Volume IV, "Bibliography on the Environmental Effects of Weather Modification," which was compiled and edited by Experiment Station personnel. The bibliography contains 1,361 citations and emphasizes the environmental effects of winter cloud seeding on various physical, ecological, biological, and cultural systems. It is designed as a reference source for scientists, environmental researchers, and policymakers involved in weather modification legislation. In addition, the contractor completed a review of possible environmental responses to wintertime cloud seeding based on information contained in nine major environmental documents, including environmental statements, research reports on the environmental effects of weather modification, and evaluations of public and environmental group concerns about weather modification. The report is tailored to address public and scientific concerns expressed in the Sierra Nevada. However, the information will find application among scientists and project leaders involved in other cloud seeding operations and in environ- mental statement preparation. The review was published by Water and Power as Volume V of the Sierra Ecology Project report series. ... During fiscal year 1979, the experiment station began work on a Rumerical model to be used for monitoring snowpack water content and snow conditions at various elevations in the American River Basin. The model will permit close observation of the snowpack's response to cloud seeding and may be adapted to monitor snow conditions in other mountainous regions. Data were analyzed from 29 snow courses in or adjacent to the American River Basin and compared to data gathered at the CSSL near Soda Springs, California. The comparison was made to establish whether CSSL data may be used to predict snow conditions in other snow courses. Thus far, estimates are accurate for courses in the same elevation zones as CSSL but become less reliable according to elevational differences. When completed, the model will permit scientists to simulate snowpack condi- tions not affected by cloud seeding. By factoring into the model the extra water produced by cloud seeding, effects on vegetation, streamflow, snowmelt extension, and wildlife may be anticipated. Data collected by SCPP instrumen- tation also will be integrated into the model. . The Experiment Station's fiscal year 1979 responsibilities included collecting weekly snow profiles from six sites located at 150 m elevational levels along Interstate 80 in the SCPP study area. The data will be analyzed and used to develop a formula for altitudinal snowpack development and melt for future environmental monitoring. Forest Service personnel also photographed snow crystals for the SCPP. .t During fiscal year 1979, the principal investigator for the Sierra Ecology Project was consulted by Water and Power on preparation of the SCPP Environ- mental Assessment. The Experiment Station also hosted a 2-day Environmental Monitoring Systems Workshop for the SCPP in Berkeley, California. The workshop was attended by SCPP managers, natural scientists, environmentalists, and citizens group representatives. The group developed a framework for an environmental monitoring program for the SCPP study area. 30