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Last modified
1/26/2010 12:46:51 PM
Creation date
10/11/2006 11:20:48 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.106
Description
Animas-La Plata
State
CO
Basin
San Juan/Dolores
Water Division
7
Date
10/25/1991
Title
Final Biological Opinion - 1991
Water Supply Pro - Doc Type
Biological Opinion
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<br />. <br />f <br />~ <br />I <br />f' <br />, <br /> <br />21 <br /> <br />;1 <br /> <br />impact of State or private actions contemporaneous with this consultation. <br />There are no Federal projects in the area that have undergone formal Section 7 <br />.:onsultations nor any contemporaneous State or private projects that would <br />affect the baseline. The baseline for the Project includes all historical <br />depletions in the San Juan River Basin. Additionally, cumulative effects of <br />future State or private projects, not requiring any Federal action, that are <br />reasonably certain to occur are-to be considered in the baseline; however, the <br />Service is not aware of any ~uch future projects. Table 3 identifies each <br />project in the baseline and its associated depletions, <br /> <br />Included in the baseline, along with a number of other smaller water projects, <br />are existing operational portions of the Navajo Indian Irrigation Project, which <br />was authorized on June 13, 1962, to provide irrigation water for 110,630 acres <br />of Navajo-owned land in northwest New Mexico, generally south of Farmington. <br />Construction of the Navajo Indian Irrigation Project began in 1973, and limited <br />operation began in 1976 and 1977. The Navajo Indian Irrigation Project was <br />constructed in blocks of 8,000 to 10,000 acres, based on congressional <br />appropriations. Since construction began, 6 blocks have been completed and, as <br />of 1990, a total of 54,500 acres have been developed, representing a net annual <br />depletion of 132,980 acre-feet. Blocks 7 through II, which have not yet <br />diverted water for irrigation, are not included in the baseline. Existing <br />depletions caused by the San Juan-Chama Project and evaporation losses from the <br />Navajo Reservoir also are included in the baseline. <br /> <br />Finally, the analysis quantified the post-Project condition by adding the full <br />Animas-La Plata depletions of 154,800 acre-feet to the baseline of 566,000 acre- <br />feet (a depletion of 591,000 acre-feet upstream of the Mancos River, with a <br />return flow of 25,000 acre-feet from the Dolores Project) identified in Table 3. <br />This results in a post-Project depletion in the San Juan River Basin of <br />720,800 acre-feet, or 37 percent of the 1.9 MAF mean annual yie1d.1 <br /> <br />The depletion numbers used in the analysis were provided by Reclamation for the <br />wet, average, and dry years described above. The changes in river flow, based <br />upon this full development, were quantified for the Project effects analysis. <br />These changes were analyzed and a summary of the changes between baseline and <br />post-Project flows is presented in Table 4. <br /> <br />(. <br />~, <br />~ <br />~ <br /> <br />~ <br /> <br />1 <br />A mean annual yield of 1.9 MAF for the San Juan River Basin has been used <br />throughout this report and is consistent with the period of record used in the <br />hydrological analysis. Reclamation has estimated that the long-term mean <br />annual yield of the San Juan River Basin is 2.2 MAF. <br />
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