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WSP04316
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Last modified
1/26/2010 12:54:51 PM
Creation date
10/12/2006 12:16:44 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.105.I
Description
Colorado River-Water Projects-Navajo-Environmental Studies
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
1/1/2002
Author
BOR
Title
Navajo Dam EIS-Biological Assessment-Advanced Draft
Water Supply Pro - Doc Type
EIS
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<br />210 from Fannington would be used to determine if base flows are being met. The details of this <br />21 I monitoring will be agreed upon between Reclamation and the Service. In practice, Reclamation <br />212 and the Service would discuss flows at least weekly during the summer months to determine <br />213 releases needed to meet base now recommendations. Unusually high inflows in the fall would <br />214 be released as a fall spike. <br />215 <br />216 Reclamation will utilize existing Navajo Reservoir Operations Meetings, held three times a year, <br />217 to discuss the upcoming period's operations. At these meetings, held in January, April, and <br />218 August of each year, Reclamation will solicit input regarding the many and diverse affected <br />219 resources on the San Juan River from members of the public, government (local, state, Federal) <br />220 agencies, tribes, and others to gain the required information needed to set water releases from <br />221 Navajo Reservoir. For each operation meeting, Reclamation will also utilize existing water <br />222 inflow forecasts, reservoir level, and historic averages to predict the upcoming water supply <br />223 available to meet endangered fish flow recommendations and authorized purposes. This <br />224 information will be analyzed and considered by Reclamation to develop an operation plan. The <br />225 operations will fall within the sideboards analyzed within the Navajo Reservoir Operations EIS, <br />226 with releases between 250 and 5,000 cfs. <br /> <br />227 Inherent in the operation of Navajo Dam there exist variables that influence dam operations <br />228 under all conditions and these must be considered when evaluating operations. These influences <br />229 include changes or errors associated with inflow forecasts, fluctuations in the Animas River, <br />230 strong precipitation events, the water's travel time down the river after an adjustment at the dam <br />231 occurs, gage errors and discrepancies, contractual obligations with the city of Fannington <br />232 (powerplant operations), and maintenance needs at Navajo Dam. <br /> <br />233 Two areas of flexibility may exist in the reservoir's operations. First, water committed for future <br />234 development but not currently used offers flexibility in reservoir releases. This is a significant <br />235 amount of water and it could be incorporated into operations to maintain a 250 cfs or greater <br />236 release outside the runoff season, to extend the duration of the spring peak, or for other uses. <br />237 The decision on how this water would be released will be made in discussion with the Service <br />238 during the Navajo Operations Meeting process. As this water begins to be developed and <br />239 depleted through the upcoming years, this flexibility would likely be reduced. <br /> <br />240 The second area of flexibility exists as full water development occurs. Minimum releases would <br />241 be no lower than 250 cfs, but existing flexibility within the endangered fish flow <br />242 recommendations could occasionally allow minimum summer releases to be above 250 cfs when <br />243 Animas flows were relatively low and downstream flows did not exceed 1,000 cfs. During the <br />244 Navajo Reservoir Operations Meetings and in discussions with the Service, an operation plan to <br />245 meet endangered fish flows, authorized project purposes, and water development needs will be <br />246 prepared. Unutilized or unaccounted for water, resulting from the aforementioned variables, <br />247 would be identified and used to increase summer releases or for other uses. <br />248 <br /> <br />9 <br />
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