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In general, whenever proposals are made which will change an existing streamflow or flow regime, the impact upon recreation can be determined and be Considered in the planning process. LIMITATIONS The limitations of the methods discussed in this paper should be understood prior to field testing. The single cross section. is limited to making minimum flow recom- mendations to accommodate the boating recreation activities. It is less exact than the incremental method and the location of the cross sec- tional measurement is critical. The incremental method may be used to describe the impact of a change in flow or used to identify an optimum flow. However, there is no such thing as an optimum flow or flow regime for recreation. Each recreation activity has its own unique flow requirement and frequently flow requirements conflict among activities. For example, a greater flow resulting in higher velocities may benefit the white .water boaters, but would all but eliminate fishing while wading. Usually a flow recom- mendation would be provided in terms of a flow regime. The recommend- ation of a flow regime would recognize the variable supply of water throughout the year as well as the periods of greatest demand for instream water. A flow regime for recreation would take into account the greater recreation demand during the recreation season, during the weekends, and perhaps even during the daylight hours. Use of the incremental method can provide only a measure of recre- ation potential and cannot provide adequate information for developing a recommended flaw regime based on the demand for recreation. If such a recommendation is necessary, or if knowledge of a change in recreation use or benefits, due to a change in flow, is desired, a demand-supply study should be undertaken. A demand supply study would use the output from the incremental method as the supply component. 14