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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />:. <br />I I <br />. <br />. <br /> <br />00044 7 <br /> <br />Executive Summary <br /> <br />In the long-term demand scenario (2040) that includes the enlargement of Stagecoach <br />Reservoir, Stagecoach was drawn down an average of 7,365 af per year as additional releases <br />were made out of its enlargement pool. The average draw down of Elkhead Reservoir in this <br />scenario was approximately 17,000 af. <br /> <br />Instream Flow Conditions at Juniper Canyon <br /> <br />Table S-9 shows the modeled average monthly flows (cfs)in Juniper Canyon under the <br />No Action, 2015 and 2040 demand conditions. Minimum flow conditions typically occurred in <br />the months of September through February. <br /> <br />Table 8-9 <br />Average Modeled Juniper Canyon Flows (crs) <br /> <br />October <br />November <br />December <br />January <br />February <br />March <br />April <br />May <br />June <br />July <br />August <br />September <br /> <br />No Action <br />2015 2040 <br /> <br />With Enlargements <br />Elkhead Stagecoach <br />2015 2040 <br /> <br />349 <br />306 <br />253 <br />234 <br />277 <br />603 <br />2501 <br />.5537 <br />4794 <br />1102 <br />276 <br />208 <br /> <br />333 <br />279 <br />226 <br />206 <br />246 <br />572 <br />2460 <br />5484 <br />4732 <br />1032 <br />221 <br />190 <br /> <br />353 <br />335 <br />283 <br />264 <br />305 <br />623 <br />2396 <br />5542 <br />4826 <br />1162 <br />351 <br />271 <br /> <br />299 <br />303 <br />260 <br />240 <br />278 . <br />595 <br />2332 <br />5428 <br />4763 <br />1133 <br />324 <br />203 <br /> <br />Recovery Program Integration and Recommended Flows <br /> <br />An important criteria in evaluating near-term and long-term water development projects <br />in the Yampa Basin was the effect of future development on streamflows in the Yampa River at <br />Deerlodge Park. While transfer of the Juniper Project water rights to instream flow purposes <br />at Juniper Canyon is an important step towards protecting the habitat needs of the endangered <br />fishes, depletions associated with future projects must be closely evaluated to ensure that the <br />hydrograph of the river is not substantially modified so as to inhibit their recovery. <br /> <br />A review of the future basin demands used to establish the interim flow <br />recommendations suggested that the interim flow recommendations were based on a demand <br />horizon which falls somewhere between the years 2015 and 2040. For this reason it inay be <br />more logical to focus this comparisonbetween flows predicted under near- and long-term <br />projects and the No Action alternative, rather than the interim flow recommendations. This <br />comparison is provided in Table S-9, which suggest that the effects of enlarging and operating <br />Elkhead and Stagecoach Reservoirs will be to slightly reduce Juniper Canyon flows .during the <br />early runoff period and to slightly increase flows in the remainder of the year. <br /> <br />In addition to investigating the effect of near- and long-term project development on <br />instream flows, a second quantitative measure was evaluated to establish the net depletions <br /> <br />S-26 <br /> <br />Ji ,;i, <br />