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<br />conditions could be approximated in velocities, stream width, wave size, hydraulic jump <br />formation, and depth but the PI system appears to be less complex with a similar result. <br />The acceptable conditions for a RICD are a result of the skill and sensitivity of the <br />designer in shaping an efficient flow rate over a given length and drop within the river <br />corridor as part of the river corridor. <br /> <br />. <br /> <br />Using the PI methodology, a marginal site in terms of flow rates, hydraulic gradient, and <br />site flexibility can be identified and deemed appropriate or inappropriate for an RICD <br />destination oriented facility, <br /> <br />The CWCB does not intend for the PI to be used in evaluating the upper end of potential <br />flow rates requested at a proposed RICD site. The CWCB does, however, intend for <br />the PI to be used to evaluate the appropriateness of a specific stream reach for a <br />proposed RICD water right. Provided below are three sample computations to <br />demonstrate the use of the PI, <br /> <br />Hypothetical Scenario #1 <br />The town of Riverdale, Colorado desires to obtain an RICD water right for a whitewater <br />boating course. The proposed boating course length is 850 feet, and the hydraulic drop <br />within that reach is 6 feet. The requested RICD flow rate is 200 cfs. <br /> <br />. <br /> <br />Evaluation <br />The average stream slope = 6'/850' = 0.0071 ft/ft <br />The requested flow rate = 200 cfs. <br />The PI = (0.0071 x 200) x 100 = 141 <br /> <br />Based on a PI of 141, the proposed reach may be appropriate for the requested <br />RICD since the PI exceeds the minimum recommended PI of 75, and since the <br />requested flow rate is less than the CWCB's recommended maximum RICD flow <br />rate of 350 cfs. <br /> <br />9 <br />