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6. Program water available at the CNPPID Diversion is diverted subject to the <br />remaining capacity. Remaining Program water in the river is routed downstream <br />to the Overton gage. <br />7. If selected by the user, Program water is returned to the Platte River via the <br />Jeffrey Return subject to remaining capacity for the Return. Program water is then <br />routed downstream to the Overton gage. <br />8. If re-regulation at Johnson Lake is selected, Program water is bypassed, stored, or <br />released to the J-2 Return. Program water is routed downstream to the Overton <br />gage. <br />9. Program water reaching the Overton gage is the sum of Program water at Brady, <br />Jeffrey Return, and J-2 Return subject to travel times and losses. <br />Routing of water through the river for Case II (Districts do not divert Program water) is <br />performed in the following order: <br />1. Program water in the South Platte River (Tamarack I) is routed downstream to <br />North Platte (confluence). <br />2. Program water is released from Lake McConaughy to the North Platte River <br />subject to ramping rate limitations and remaining capacity at the North Platte <br />"choke point". <br />3. Program water in the North Platte and South Platte Rivers is added at the <br />confluence for a total combined flow of Program water. <br />4. Program water is routed downstream from North Platte to Overton subject to <br />travel time and losses. <br />The routing tool is applied to each year of the study period for each the two target flows <br />and two cases. The spreadsheet is set up to evaluate one target and case combination, <br />resulting in four individual spreadsheets for each year of the study. <br />User input and evaluation is required to identify the operations and time period most <br />likely to achieve the target flow. The user is required to flag days for releases from Lake <br />McConaughy to meet the flow targets at Overton considering travel times, capacities, and <br />9304iLE Page 28 of 58 January 29, 2008 <br />PRRIP - Draft Water Management Study, Phase I