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• Jeffrey Return <br />- The maximum return is 1,250 cfs. <br />- Capacity for Program water is limited during the irrigation season <br />when the return is being used for NPPD irrigation flows. <br />- Use of the Jeffrey Return may be limited during the dry years from <br />August through September due to CNPPID water conservation <br />practices. This limitation is interpreted as a potential operating <br />constraint and therefore not yet included in the tools developed for <br />this study. <br />- Use of this return diminishes the flow continuing to Johnson <br />Reservoir and could therefore reduce the capacity for regulation of <br />Program water in Johnson Reservoir andlor the amount of water <br />that can be released through the J-2 return. <br />• J-2 Return <br />- The maximum return is 2,000 cfs. <br />- The capacity for return flows will decline from 2,000 cfs in mid <br />April when irrigation deliveries begin. In dry years (when <br />irrigation deliveries are reduced), available return flow capacity <br />may be as high as approximately 800 cfs from July 1 to September <br />15. In some years, there may be no return flow capacity available. <br />3.2.3 NPPD System Limitations and Capacities <br />• Keystone Diversion <br />- The maximum capacity of the diversion is 1,750 cfs all year <br />barring icing conditions, summer weed growth, system <br />maintenance and unplanned malfunctions. <br />I30WLE Page 11 of 58 January 29, 2008 <br />PRRIP - Draft Water Management Study, Phase I