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.' 001312 would be useful to know whether the number of fisherman increases or decreases and whether they are more or less satisfied than before. Unfortunately, there is very little empirical information about the relationship between recreational activities and changes in stream flow. An effort is underway to remedy this problem, but it is not yet clear whether this research will be successful. If it does, a new impact category, measuring days of recreational activities, will be used in addition to, or in lieu of, the two instream flow impact categories. Summary. The element common to each of the above impact categories is that each water using activity* has a direct and demonstrable effect on one or more of the items being measured. The water study will depict the effects of any of eight water uses on incomes, jobs, acres, of irrigated farmland, acres of lawns and gardens, and the stream flows required for fishing and boating activities. These impacts will be shown for each of eight hydrologic regions, and on a statewide basis, For the purposes of analysis and comparison, the amount and the location of an *The water study examines eight different water uses or activities. The consumptive uses examined include irrigated agriculture, steam electric power generation, oil shale, coal gasification, coal liquefaction, coal slurry pipelines, and municipal uses. Other industrial uses, including coal mining, were initially examined, but projections of the additional amounts of water consumed by the growth of such uses were so small that they have been dropped from consideration, The non-consumptive use examined is maintenance of stream flows for fishing, and for whitewater boating, recognizing that the flows required for the two are not the same. 20