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000579 . The CWCB recommends an RICD flow rate in the range of approximately 50 cfs to 350 cfs for each destination-oriented boating facility. The actual RICD flow rate for a specific site and time of use will vary within this range depending on water availability and other factors related to the recreational facility. The CWCB suggests that an RICD water right should be granted for an intended use and for a specific flow rate necessary to provide the intended reasonable recreation experience during an intended period of time of use. The CWCB suggests that an RICD flow rate may be unreasonable if it exceeds the 40th percentile flow rate during the intended time period (flow rates can be evaluated or estimated using available streamflow gage data or other acceptable means). . Based on the futile call doctrine, a holder of an RICD should not be able to call for the water right if such a call would provide insufficient flow for a reasonable recreational experience. The above-recommended range of flows for a destination-oriented RICD was arrived at through the following means: . A review of existing courses in Colorado and existing and planned "pay for- courses worldwide. At "pay for" courses, the boaters are presumably having a reasonable recreational experience because they are willing to pay for the experience. (See the "Summary of Hydrologic Requirements in the Appendix). . SUrveys of existing boating courses in Colorado Those surveys determined that a reasonable recreation experience could be obtained at those courses within the range of flow rates stated above. · Recommendations and opinions from the CWCB's RICD expert, who has significant experience with evaluation and design of boating courses locally and nationwide. · Evaluations that the high end of the CWCB's recommended flow range (350 cfs) is at or above the minimum flow rate utilized for a significant rumber of recognized and international quality sites throughout the world (including the internationally recognized boating course at La Seu d'Urgell, Spain, which operates with flows as low as 210 cfs. See the appendix for details). 6. Hvdrcwlic EmineerirIQ Definition of Control A recreational whitewater boating course must include manmade hydraulic stream features that provide "control" of the entire RICD streamflow as required by engineering principles. The hydraulic engineering definition of control is: A section across the stream where a manmade structure causes the flow to pass through critical depth when flow changes from subcritical to supercritical. The phenomenon gives rise to what is known as a control section. Control of the entire flow should occur and be effective within the river cross-section of interest for each RICD flow rate requested 5