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WSP07567
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Last modified
1/26/2010 2:27:55 PM
Creation date
10/12/2006 2:28:01 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8282.600.10
Description
Colorado River Operating Annual Reports
Basin
Colorado Mainstem
Date
1/1/1993
Author
USDOI/BOR
Title
Operation of the Colorado River Basin 1993 Projected Operations 1994
Water Supply Pro - Doc Type
Publication
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<br />NAVAJO RESERVOIR <br />(SAN JUAN RIVER) <br /> <br />Water Year 1993 <br /> <br />The elevation of Navajo Reservoir at the beginning of the <br />water year was 1852.3 meters (6077.3 feet) with 1,948 million <br />cubic meters (1,579,000 acre-feet) of live storage (93 percent <br />of capacity). At the end of water year 1993, the elevation <br />was 1853.2 meters (6080.3 feet) with 2,004 million cubic <br />meters (1,625,000 acre-feet) of live storage (96 percent of <br />capacity). <br /> <br />Actual inflow to Navajo Reservoir for water year 1993 was <br />1,794 million cubic meters (1,454,000 acre-feet), 152 percent <br />of normal. Peak inflow into Navajo Reservoir occurred on <br />May 27, 1993, at 255 cubic meters per second (9020 cubic <br />feet per second). The reservoir reached a peak elevation of <br />1853.4 meters (6081.0 feet) on September 15, 1993. The <br />April through July unregulated inflow into Navajo Reservoir <br />in water year 1993 was 1,188 million cubic meters (963,000 <br />acre-feet) or 145 percent of avcrage. In order to <br />accommodate the high spring inflow, releases were increased <br />in late February, reached 127.4 cubic meters per second <br />(4,500 cubic feet per second) in early March, and were <br />maintained at that level through May 1. During the fllst <br />part of May it became apparent that inflow was not going to <br />be as high as forecasted and releases were reduced to 42.5 <br />cubic meters per second (1,500 cubic feet per second) until <br />June 2, 1993, when releases for endangered Hsh were <br />initiated. Navajo Reservoir nearly filled in July 1993. <br /> <br />ACT\JAL RELEASES 1993 <br /> <br />...WON CUBIC IIETDII <br />llOO <br /> <br />ntOUINID ACIII-FHT <br />401 <br /> <br />.. DO R NIP <br /> - <br /> / \ ./ <br /> / \ <br /> -- <br /> - <br /> <br />400 <br /> <br />124 <br /> <br />300 <br /> <br />243 <br /> <br />200 <br /> <br />112 <br /> <br />100 <br /> <br />11 <br /> <br />)- #... .,,0 )~ ~ ~ , .; ~ ~ " ,,0 <br /> <br /> <br />Section 7 Consultation with the Fish and Wildlife Service for <br />the operation of Navajo Dam was continued in 1993. Water <br />year 1993 was the third year of a 7-year study to evaluate <br />alternative operations of Navajo Reservoir to beneHt <br />endangered Hsh. In accordance with this 7-year study, spring <br />operations of Navajo were modified in 1993 and large <br />releases of up to 127.4 cubic meters per second (4,500 cubic <br />feet per second) were made during the fllst part of June to <br />coincide with the peak flows of the Animas River to study <br />the effect of large spring flows on the habitat improvement <br />and spawning success of endangered endemic species of fIsh. <br />Due to this operation, flows of over 311.5 cubic meters per <br />second (11,000 cubic feet per second) were achieved at the <br />confluence of the Animas River with tbe San Juan near <br />Farmington, New Mexico. This flow was less than the <br />estimated safe channel capacity of 339.8 cubic meters per <br />second (12,000 cubic feet per second), so no significant <br />flooding occurred on the San Juan River. After the <br />completion of the large spring releases, flows were reduced <br />to approximately 17.0 cubic meters per second (600 cubic <br />feet per second). The objective was to maintain a minimum <br />release of 14.2 cubic meters per second (500 cubic feet per <br />second) from the reservoir, to meet downstream demands <br />and to preserve the blue ribbon sport' fishery located <br />immediately downstream of the reservoir. The release of <br />14.2 cubic meters per second (500 cubic feet per second) is <br />an objective only and is not a minimum flow requirement. <br /> <br />NAVAJO RESERVOIR <br /> <br />Reservoir <br /> <br />Storage Capacity <br />Normal Pool Elevation <br />Surface Area, full <br />Rcscl.'YOir Length, full <br /> <br />2,092 million cubic meters (1,696,400 acre.feet) <br />1854.6 Me'ers (6085.0 Feet) <br />6,317 Hectares (15,610 Acres) <br />S3 Kilometers (33 Miles) <br /> <br />11 <br />
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