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I I I I I I I I I I I' I I I I I I I I aerosol generators closer to the target areas and potentially reducing the uncertainties related to transport and dispersion. Seeding through propane release at elevations near 0 EC may enable or improve the treatment of warmer cloud cases and present advantages of greater simplicity of operation and maintenance, lessened uncertainty of transport and dispersion, and decreased likelihood of extra-area effects. A.3.1.2 Remote and in situ sensing It will be essential to ensure that there are sufficient remote sensing and in situ systems available to prepare for the optimum locations of ground-based or airborne seeding equipment in relation to the occurrence of supercooled liquid water and its real time development over the orographic barriers within the watershed as well as for choosing optimum times for seeding during winter storm passages over the watershed. A.3.1.3 Trace chemical facilities It will be essential to ensure that adequate trace chemical laboratories are available for analyzing the snowfall for silver, indium, cesium and other tracer materials used in these augmentation studies. Snowpack core profiling methods, when used in conjunction with normal snow gauges, enable time-related precipitation increments to be identified and directly related to the seeding processes. A.3.1.4 Modeling within the experiment Appropriate mesoscale models will be employed to provide wind flow patterns and predictions of precipitation fallout for comparison with actual observed values and to improve the likelihood of achieving statistically significant results in the shortest time. A.3.1.5 Statistical analysis methods Because of the opportunity to shift the design of this 'Watershed Experiment" to the use of physical and chemical assessment methods and to continue to satisfy the requirement of unbiased randomization, there is now a special need for new statistical approaches enabling comparisons to be made between those portions of the snowpack which have been impacted by the seeding and those which have not. For example, can snow samples that contain no seeding material be considered as a "no-seed" comparison set? Statistical methodology that incorporates consideration of variation of effects in time and area needs additional exploration. A.3.1.6 Water needs 'Watershed Experiments" should be conducted in areas where Water Resources are a crucial issue. Beyond the actual seeding experiment, investigations could include ground water recharge of aquifers and relationships between precipitation amounts and stream flow. 6