9676 - Laserfiche WebLink

Home Browse Search

include flows to operate the fish passage as well as allow adequate flows for fish migration in the lower 3 miles of the Gunnison River. Model results were inspected to determine how well recommended 300 cfs flow levels were met. The following table shows the number of days during the 1975 to 2000 modeling period when flows below 300 cfs occurred below Redlands during times when a minimum of 300 cfs was recommended under modeled baseline and flow scenarios. For information purposes, this table also shows the frequency of flows less than 250 cfs, 200 cfs, and 100 cfs for these periods. Gunnison River Below Redlands Diversion Dam Number of Days When Flows Are Less Than Specified Flows When the Desired Flow is >= 300 cfs (For 1975-2000 Modeling Period: 7,953 Days) < 300 cfs 1033 647 657 657 <250 cfs 884 246 248 248 <200 cfs 747 80 79 79 <100 cfs 504 15 13 13 For the baseline model run, this table shows flows greater than or equal to 300 cfs not being met on 1033 days or 13 percent of the time during periods when this flow level is recommended. For the FWS flow scenarios, flows greater than or equal to 300 cfs were not met for 647 to 657 days, or approximately 8 percent of the time during periods when this flow was desired. While this shows some improvement in the recommend flow scenarios in meeting flows greater than or equal to 300 cfs, more significant improvement is shown in reducing the frequency offlows less than 250 cfs, less than 200 cfs, and less than 100 cfs below the Redlands Diversion Dam. ' Effects on Aspinall Unit Purposes General The Aspinall Unit is operated to meet many purposes and provide a wide spectrum of benefits to the public. On a highly visible level, the Aspinall Unit provides reservoir and river recreation for over 1 million visitors annually. A Gold Medal tai1watertrout fishery and unique river rafting opportunities have developed under existing flow regimes. Also of significance, the Aspinall Unit 6