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<br />Durango RICD <br /> <br />It has not been demonstrated that these proposed structures will be durable or that they <br />will reliably control the flow over a reasonable period of time. <br /> <br />Basis of Opinion <br /> <br />~ <br /> <br />The structures' durability, including their ability to withstand high fl~w~has not been <br />demonstrated. Structural stability and hydraulic analy~including up1iIt, piping, and seepag.j <br />were not provided. It was not clear how much water will flow beneath the structures <br />(uncontrolled flow) or for how long the structures will reliably control the surface flow. <br />Therefore, the ability of the in-channel structures to reliably control all of the flow has not been <br />demonstrated. <br /> <br />Legal Basis <br />Policy Manual: <br />Policy Manual: <br />SB 216: <br />SB 216: <br />SB 216: <br />SB 216: <br />SB 216: <br /> <br />Supreme Court Decision: <br /> <br />Adverse Impacts and Durability <br />Hydraulic Engineering Definition of Control <br />Appropriate Reach of the Stream Required for the Intended Use. <br />(10.3) Capture and Control <br />Access for Recreational In-Channel Use. <br />Section 2, 37-92-103, (4) Beneficial Use <br />Section 2, 37-92-103,(10.3), Recreational In-channel Diversion <br />Means... <br />Minimum Flow Rate <br /> <br />Opinion #9. <br /> <br />It has not been demonstrated that these in-channel structures control throughout the <br />requested flow range. <br /> <br />Basis of Opinion J::..l\~~' <br />A hydraulic co~;~ Itn.own as critical depth should occur near the entrance o{ each structure. <br />This conditiOI1;~i;~~~~Ydraulic control of the river flow (above the structure's invert) at that <br />particular flow rate arId at that time. However, there are no documents or analysis that <br />adequately substantiate that these in-channel structures will create this control over the requested <br />range ofRICD flows. Therefore, "control" of the requested flow rates has not been <br />demonstrated. <br /> <br />Legal Basis <br />Policy Manual: <br />SB 216: <br /> <br />Hydraulic Engineering Definition of Control <br />(10.3) Capture and Control <br /> <br />