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Last modified
1/26/2010 12:32:12 PM
Creation date
10/11/2006 10:36:24 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8441.700
Description
Colorado Big Thompson Project - Annual Operating Plans
Basin
South Platte
Water Division
1
Date
1/1/2002
Title
Annual Operating Plans - Colorado Big Thompson Project and Western Division System Power Operations - Calendar Year 2002 Summary of Actual Operations and Calendar Year 2003 Annual Operating Plans
Water Supply Pro - Doc Type
Report/Study
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<br />FEBRUARY THROUGH SEPTEMBER <br /> <br />? <br /> <br />., <br />, <br /> <br />N <br /> <br />Most Probable Inflow Forecast <br /> <br />.... <br /> <br />Q <br /> <br />Green Mountain Reservoir <br /> <br />If most probable runoff conditions develop, releases from Green Mountain Reservoir could be <br />increased to approximately 200 ft3 Is during March. The target end-of-the-month storage for Green <br />Mountain in March is 70,000 acre-feet. This target will prepare the reservoir for the spring runoff <br />season. As the reservoir fills during the May-July runoff period, releases will be adjusted to achieve a <br />fill without spilling. If the fill is achieved, it could happen by late June. <br /> <br />The impacts of the severe drought will prevent Green Mountain's participation in the Coordinated <br />Reservoir Operations this spring. The Coordinated Reservoir Operations is an interagency program <br />developed to enhance the spring peak flows along the 15 Mile Reach in an attempt to benefit the <br />endangered fish species. The idea behind the plan is to reduce the releases from traditional levels <br />before and after the peak flow enhancement. During the peak enhancement period. all inflows are <br />passed through the reservoir for an approximate ten-day period. With normal inflow and near-average <br />releases for downstream water users during August and September. storage is projected to be <br />approximately 95,000 acre-feet by the end of September. <br /> <br />With most probable runoff conditions, Denver and Colorado Springs' Blue River depletions are <br />projected to be approximately 106,300 acre-feet during the Water Year 2003. <br /> <br />Willow Creek Reservoir <br /> <br />Under the most probable conditions, Willow Creek Reservoir will fill to approximately 10,000 acre- <br />feet by the middle of June. Releases to the river of7 ft3/s between February to April, followed by 24 <br />ft3 Is during May, 44 ft3 Is during June, and 61 ft3 Is are expected. A bypass release through the outlet <br />works of excess water between April and July will be initiated if Lake Granby approaches maximum <br />capacity, but this situation is not expected to occur. No bypass releases are anticipated for this year <br />due to the dry conditions dominating the region. Willow Creek storage will be approximately 9,000 <br />acre-feet by the end of the Water Year, as long as the most probable conditions prevail. <br /> <br />Lake Granbv <br /> <br />Lake Granby storage will approach a low point of86,000 acre-feet by the end of March. Assuming <br />the most probable inflow, storage volume is expected to reach 254.300 acre-feet, with a surface <br />water elevation of 8233.63 by the end of June. This water surface level is 36 feet below its <br />maximum operating elevation of8279.50 feet. The storage volume is more than 200,000 acre-feet <br />below the 3D-year average reservoir storage for June. No bypass releases are anticipated for this <br />Water Year. Therefore, Lake Granby will not be able to participate in the Coordinated Reservoir <br />17 <br />
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