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WSP00672
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Last modified
1/26/2010 12:27:14 PM
Creation date
10/11/2006 9:52:26 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
822.600.10
Description
Colorado River Annual Operating Plan - Annual Reports
Basin
Colorado Mainstem
Date
1/1/1993
Author
USDOI/BOR
Title
Annual Operating Plan
Water Supply Pro - Doc Type
Annual Report
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<br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br /> <br />7 <br /> <br />stable flows between 1,100 and 1,800 cfs on the Green River near the Jensen, Utah, gaging <br />station during the summer and fall months. <br /> <br />Flaming Gorge is not expected to fill in 1993 except under the probable maximum inflow <br />scenario. Under the most probable inflow scenario, Flaming Gorge is expected to gain <br />storage but will still be approximately 6 feet short of ftlling. <br /> <br />Blue Mesa, Morrow Point, and Crystal Reservoirs (Aspinall Unit) <br /> <br />The April through July runoff during 1992 into the Aspinall Unit was only 450,000 AF or <br />65 percent of average. Blue Mesa was approximately 130,000 AF short of filling in 1992. <br /> <br />Section 7 consultation with FWS on the operation of the Aspinall Unit was continued in <br />1992. As a result, Reclamation and FWS developed a 5 year plan of study to assess the <br />effects of various reservoir release patterns on fish habitat, reproduction success, and <br />. possible re-introduction of endangered fish into the Gunnison River. Studies began during <br />the spring of 1992. The plan recommends that through 1996, peak spring flows in the <br />Gunnison River at the Whitewater gage should be 2,000 to 5,000 cfs for 1 year; 5,000 to <br />10,000 cfs for 1 year; above 12,000 cfs for 2 years; and above 15,000 cfs for 1 year <br />(basicly, 2 years of relatively low flows and 3 years of relatively high flows). Peak flows <br />will be timed to coincide with peaks on the Colorado River, most likely to occur between <br />May 15 and June 15. A gradually descending limb of the hydrograph will be followed by <br />lower stable flows the remainder of the year. Gunnison flows during 1992 were in the low <br />range and will be counted as one of the two low years. Current most probable forecasts for <br />1993 are for Blue Mesa to fill and a peak representative of a high flow year (12,000 cfs at <br />the Wbitewater gage) will most likely be provided. Ramping rates will not exceed <br />250 cfs/day. <br /> <br />By December 1992, Blue Mesa Reservoir will be drawn down to at least an elevation of <br />7490.0 feet in order to minimize icing problems in the Gunnison River. Blue Mesa will <br />continue to be drawn down through April 1993 to a level that will accommodate the most <br />probable inflow scenario and accomplish the release objectives with a minimum of <br />powerplant bypasses at Crystal. Blue Mesa is expected to fill in the summer of 1993 and <br />flows through the Black Canyon of the Gunnison National Monument are expected to be <br />above the minimum release objective during the summer months under all three inflow <br />scenarios. The filling of the reservoir next year will ensure that reasonable specific releases <br />required to study the protection and improvement of habitat for endangered fish can be <br />accommodated. The forecasted runoff for the spring of 1993 will be monitored to achieve <br />these objectives. <br /> <br />The minimum release objective of the unit is to meet the delivery requirements of the <br />Uncompahgre Valley Project and to keep a minimum of 300 cfs flowing through the Black <br />Canyon of the Gunnison National Monument. To protect the blue ribbon trout fishery in the <br />
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