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001S45 COWRISM: A PROGRAM FOR SIMULATING RESERVOIR IMPACTS UPON RECREATIONAL WATER USE The creation and operation of surface-water impoundments on flow- ing streams inevitably alter downstream flows and thus affect down- stream water users. Planning for the development and operation of stor- age reservoirs has focused conventionally upon consumptive use of the stored water, whether withdrawn at or below the storage site, and upon those non-consumptive uses, such as reservoir-based recreation, which occur at the storage site. Considerable attention has been given recently to downstream non- consumptive, or instream uses. However, most of this attention has been from a hydrological and/or biological perspective and has been concerned almost entirely with changes in the aquatic ecosystem. This work does not really corne to grips with resultant changes in water use by recrea- tionists and others whose use patterns, while possibly affecting aquatic ecosystems, do not result in significant consumptive water use. Water resources planning cannot stop with the ecological conse- quences of stream flow changes. It must carry these changes through to their socio-economic implications. We must be able to project how down- stream water users will be affected by a proposed operating rule for a new or existing impoundment. To make such projections, however, requires modelling user behavior (demand) as well as changes in the resource base (supply), and this raises new analytical and data problems. In particular, ecological studies can be confined to hydrologic units, such as river basins (unless transbasin diversions are in pros- pect and/or ecological changes beyond those of the aquatic ecosystem are likely to be significant). Human beings, however, range widely across 1