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<br />a. Ramping Flows <br /> <br />Denver Water commits to a gradual ramping schedule for flow changes from the Roberts <br />Tunnel as shown in Table 3. This ramping schedule will help to minimize impacts to <br />trout populations during flow changes. It may not be possible to meet the ramping <br />guidelines during emergencies, maintenance projects, water rights constraints, and power <br />plant upsets. <br /> <br />b. Winter Streamflow <br /> <br />Most winters the Roberts Tunnel discharges at about 75 to 100 efs which provides <br />important augmentation of fish habitat. Winter deliveries have also provided an <br />important means of managing ice accumulation along the river. In wet years such as <br />1984 and 1995 the tunnel was not operated in the winter. Winter releases are expected to <br />increase as more people move into Denver Waterts service area. <br /> <br />c. Peak Streamflow <br /> <br />Flow easement agreements and channel capacity limit the Roberts Tunnel releases during <br />high streamflows. <br /> <br />d. Channel Modifications <br /> <br />When doing channel work on the North Fork, Denver Water commits to maintaining or <br />enhancing the structural habitat for trout. CDOW will be consulted on this work. <br /> <br />E. Whitewater Recreation <br /> <br />1 ~ Overview <br /> <br />The portion of the South Platte River covered by this Plan is used by over <br />12,000 kayakers, rafters, and canoeists each year. It accommodates 70 percent of the <br />whitewater boating in the Pike National Forest. It offers over 40 miles of Class I-V <br />whitewater boating opportunities. The two forks of the South Platte are especially <br />important because of late season supplemental streamflows for water supply and their <br />close proximity to the Denver metro area. <br /> <br />2. Mainstem of the South Platte <br /> <br />This Plan recognizes that whitewater boating on the mainstem of the South Platte is an <br />important recreational acti vity that should be considered along with other needs for <br />streamflow management Where other objectives can be met and there is still flexibility <br />to manage streamflows on the river, it is desirable to maintain and enhance streamflows <br />for whitewater recreation. Some streamflow adjustments, such as timing and minor <br />changes in volume to enhance whitewater recreation, within the limited flexibility of <br />water supply demands; are encouraged by this Plan. <br /> <br />N:\Supply\ Waage\wildscen\attachb.doc <br /> <br />B-15 <br />