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The available capacities in the river and systems were quantified for Average, Wet, <br />and Dry year classifications for river reaches of interest. Available channel capacities <br />for Program water were computed by comparing physical capacities in selected river <br />reaches to streamflow records. Capacities were computed on a daily basis using daily <br />flow records, then summarized on a monthly basis and expressed as average flow <br />rates for Average, Wet, and Dry years. <br />Canal capacities available for Program Water were based on historic diversions for <br />the two systems. The constraint in any month was based on headgate diversion <br />capacity at the Korty, Keystone, and CNPPID diversions and return capacities at the <br />North Platte Hydro, Jeffrey, and J-2 Returns. As with the stream channels, available <br />canal system capacities for Program water were summarized on a monthly basis and <br />expressed as average flow rates for Average, Wet, and Dry years. <br />A spreadsheet tool organizing the system capacity and remaining capacity for <br />Program water by reach was developed. This spreadsheet analysis supports the <br />sensitivity analyses on particular constraining capacities in the systems and the <br />limitations on delivering water to the critical reach. The average remaining capacity <br />for Program water, based on the known capacities, is presented in Table 3-7 entitled, <br />"Remaining Capacity for Program Water for Average, Wet, and Dry Years". The <br />volumes of Program water necessary to achieve the recommended flows of 5,000 cfs <br />and 800 cfs of Program water were quantified for two cases as part of the routing <br />analysis discussed in the following sections. <br />3.7 Development of Routing Tool for Program Water <br />The routing of Program water is subject to the capacities, travel times, and losses <br />described above. The routing tool is used to evaluate two target flow rates of Program <br />water (5,000 cfs and 800 cfs) for two Cases (with diversion of Program water by the <br />Districts and without diversion of Program water by the Districts). The routing tool <br />evaluates the flow of Program water at Overton resulting from releases to the North <br />Platte River from Lake McConaughy and Program water credited to the Tamarack I <br />project on the South Platte River. The routing tool estimates a total required release <br />AB0WLE Page 21 of 58 January 29, 2008 <br />PRRIP - Draft Water Management Study, Phase I