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<br />Durango RICD <br /> <br />Opinion #10. <br /> <br />It has not been demonstrated that there is appropriate access to the structures. <br /> <br />Basis of Opinion <br /> <br />While it appears that there may be adequate access to the in-channel structures, adequate <br />documentation of applicant's entitlement to utilize this access has not been provided. <br /> <br />Legal Basis <br />SB 216: <br /> <br />Access for Recreational In-Channel Use. <br /> <br />Opinion #11. <br /> <br />It has not been demonstrated that the features meet the objective of providing a <br />reasonable recreational experience at a minimum stream flow. <br /> <br />B . fO" ~ " <br />aSls 0 pInion <br />Results and calculations from design efforts, analysis, hydraulic mo el have not been provided. <br />Therefore, evaluation of the efficiency of design of the course is no ossible. To design a whitewater <br />course, or any complex hydraulic structure, an analysis requires a ydraulic model. Because equations <br />that govern fluid flow are not linear, this modeling and analysis. an iterative process. An in-channel <br />whitewater course must perform over a wide range of flows, sediment loadings, tailwater conditions, and <br />streambed compositions. Furthermore, courses such as this one must accommodate a wide range of users. <br />These factors can greatly impact the design of an efficiently operating whitewater course. While <br />qualitative and artistic judgments are critical in interpreting and design, adequate analysis is also required <br />to design an efficient and optimized whitewater course. In the absence of detailed analysis or modeling in <br />this case, efficient design and optimization of the whitewater course, with respect of flow and <br />performance, cannot have been conducted. Therefore, a determination of the minimum flow required for <br />a reasonable recreational experience was not substantiated. <br />-S <br />The reports show a weir calculation, but it is not clear how this was used in design. <br /> <br /> <br />Legal Basis <br />SB 216: <br />SB 216: <br />SB 216: <br /> <br />(10.3) Capture and Control <br />Section 2, 37-92-103, (4) Beneficial Use <br />Section 2, 37-92-103,(10.3), Recreational In-channel Diversion <br />Means... <br />