Rule 26(A)(2) Disclosure of the CWCB and the State and Division Engineers

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indicates that 60% of mean annual flow is necessary for good recreation habitat, based on rule of thumb observations he made over decades of fisheries- related work in Montana. Following a similar logic, but with greater sophistication aimed more directly at a specific type of recreation, Corbett related professional judgment estimates of "canoe zero' (a minimum boat passage flow for open canoes) to mean annual flows for several streams in the eastern United States. This led to the development of two mathematical relationships between minimum boating flows and mean annual flows for flat water and whitewater streams, as given below: For whitewater streams: minimum flow in cfs = 17.11 (mean annual flow in cfs) For flatwater streams: minimum flow in cfs = 10.13 (mean annual flow in cfs) Reviews of the method and its utility are presented in Shelby and Jackson (199 1) and Whittaker et al. (1993). We intend to make these calculations of threshold minimum flows for completeness, and as a check on other information. Results will be provided in the supplemental report. Integrating Information The final steps in the study process will be to 1) integrate information from the multiple sources described above and develop flow evaluation curves for flow - dependent opportunities, and 2) integrate hydrology information to ascertain the relative frequency of different types of opportunities in an average year. Similar analyses can then be conducted for proposed alternative flow regimes to determine potential impacts from various types of claims. These curves and subsequent analysis of opportunity frequencies with various flow claims will be presented in the supplemental report; they cannot be completed until the interview and fieldwork components of the study are completed. Likely Format for Findings and Discussion Project Description The supplemental report may include maps, photos, and a brief description of the site. Respondent Characteristics The supplemental report will summarize interview results that profile the sample: Years boating. Days boating per year. Visits to Clear Creek course. Lowest and highest flows boated on Clear Creek course. Gender Residency Distance to course Recreation Opportunities and Attributes The supplemental report will provide short descriptions of major boating opportunities, which are likely to include: 1) slalom racing for highly skilled boaters, 2) rodeo /playboating for highly skilled boaters; 3) slalom racing and skill development for less skilled boaters; 4) rodeo /playboating and skill development for less skilled boaters; 5) general boating use (low flow practice), and 6) general riverside recreation (aesthetics). Clear Creek Whitewater Park flow assessment / January 2001 6