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<br />- <br /> <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />'. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />discharge rates. Detailed hydrologic analysis will generally provide more accurate results <br />because it incorporates site specific basin characteristics. It is the recommended approach where <br />time and budget allow. Analysis using the regional regression equation approach of Equation 1 <br />offers fast estimates of discharge rates but can only be used to determine 100-year flows and <br />could potentially have larger margins for error. Table 3 presents discharge rates for key points <br />on approximately studied streams within Pitkin county computed using the CWCB regional <br />regression equation approach. <br /> <br />Reservoirs. Reservoirs exist on two approximately mapped stream systems within Pitkin <br />County. The largest of these is Ruedi Reservoir on the Fryingpan River along the northern <br />boundary of the county. Ruedi Reservoir is a water supply facility which has a total capacity of <br />102,369 ac-ft but no dedicated flood storage capacity. Because of this, the U.S. Bureau of <br />Reclamation (USBR), which is responsible for operation of the reservoir, has recommended that <br />no credit for reductions in flood flow be taken for the reservoir. The 100-year discharge value <br />presented in Table 3 for the approximately studied reach of the Fryingpan River immediately <br />downstream of the reservoir has been computed using the CWCB regional regression equation <br />for the Upper Colorado River Subregion (Equation 1). In accordance with USBR <br />recommendations, the computed discharge does not include any reduction in flows by Ruedi <br />Reservoir. <br /> <br />Grizzly Reservoir is a small water supply facility located on Lincoln Creek. Grizzly Reservoir is <br />owned by the Twin Lakes Reservoir and Canal Company and has no dedicated flood storage <br />space. No credit for potential storage of flood flows should be taken for this reservoir. <br />Discharges for the approximately mapped reaches of Lincoln Creek downstream of Grizzly <br />Reservoir may be computed using the CWCB regional regression equation for the Upper <br />Colorado River Subregion (Equation 1). <br /> <br />7 <br />