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WSP08809
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Last modified
1/26/2010 2:49:45 PM
Creation date
10/12/2006 3:17:22 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.106
Description
Animas-La Plata
State
CO
Basin
San Juan/Dolores
Water Division
7
Date
1/1/1996
Title
Correspondence regarding the Final Biological Opinion - 1996
Water Supply Pro - Doc Type
Biological Opinion
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<br />U.S. Fish and wildlife Service <br />January 30, 1996 <br />Page 7 <br /> <br />near Archuleta gage, the flow was 250,000 acre-feet and in 1956 it <br />was 290,000 acre-feet. The research should be directed to best <br />utilize reservoir storage to augment other downstream tributary <br />flows consistent with the available runoff to accomplish the goals <br />of the program. Annual spring flows of 300,000 acre-feet are not <br />the natural hydrograph and there is evidence such flows are not <br />necessary to meet the goals of the Recovery Implementation Program. <br />Similar comments apply to the discussion at pages 11 and 13. <br />Because the inflow to Navajo Reservoir, as well as the downstream <br />tributary inflows, are forecastable for each year, releases from <br />Navajo Reservoir can be scheduled to maximize the available water <br />supply to meet the goals of the program. <br /> <br />Page 8, item F. The first word of the third sentence, "This", <br />is indefinite and, as written, refers to the diversion of 41,700 <br />acre-feet in Colorado, which is not what is intended. It is <br />suggested that that "Stage A" be inserted in lieu. <br /> <br />Item F also discusses the depletion due to Stage A and refers <br />to "annual average depletions" being different from "net <br />depletions", and lists depletions ranging from a low of 22,000 <br />acre-feet to a high of 68,000 acre-feet for Stage A. The <br />discussion also refers to Figure 22 stating that 57,100 acre-feet <br />would be exceeded over 60% of the time. Please refer to our <br />previous discussion of the determination of depletion. It is <br />strongly recommended that depletion values used in the draft be <br />consistent with depletion values as determined by water management <br />agencies. <br /> <br />Further, the last sentence on page 8 carries the same <br />implication with respect to water available for future development <br />as discussed above, that Navajo Dam must be operated to provide <br />300,000 acre-feet for endangered fish 96% of the time before Stage <br />A can be operated to effect an average annual depletion of 57,100 <br />acre-feet. <br /> <br />Page 13. The last sentence states that reducing Navaj 0 <br />Reservoir releases in dry years to adult maintenance levels would <br />increase the number of years that spring peaks could be augmented. <br />We submit that this scenario must be developed and considered in <br />order to meet the goals of the Recovery Implementation Program. <br />
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