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SanJuan_BasinReport_20051101
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Last modified
9/26/2011 8:36:12 AM
Creation date
7/15/2008 10:59:35 AM
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Decision Support Systems
Title
San Juan/Dolores River Basin Information
Description
General information regarding surface water projects and operations within the San Juan and Dolores River Basins.
Decision Support - Doc Type
Basin Report
Date
11/1/2005
DSS Category
Surface Water
DSS
Colorado River
Basin
San Juan/Dolores
Contract/PO #
C153933, C154062
Grant Type
Non-Reimbursable
Bill Number
SB92-87, HB93-1273, SB94-029, HB95-1155, SB96-153, HB97-008
Prepared By
Leonard Rice Engineering
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winter and early spring months, the releases were increased as necessary to create flood control <br />space for the anticipated runoff. <br />In recent years, as part of the Recovery Implementation Plan, the U. S. Fish and Wildlife <br />Service (USFWS), in concert with the USBR and other water users on the San Juan River, has <br />been re-evaluating the release patterns from the reservoir. One alternative being considered <br />involves an increased flow release during the spring runoff months to more closely replicate <br />the historical runoff hydrograph. To support this higher spring release, it is also necessary to <br />reduce the normal release during the non-irrigation season in the fall and winter months, <br />typically from the historical practice of 500 cfs ~ to about 250 - 300 cfs. This evaluation is on- <br />going and no specific alterations of the historical release pattern have yet been approved by all <br />parties. For purposes of the San Juan Model, it is recommended that the reservoir operation <br />include a minimum release of 250 cfs during the irrigation season and the winter months. The <br />release should be set up as a variable to accommodate future release rates that may evolve from <br />the Recovery Implementation Plan. <br />Navajo Indian Irrigation Project (NIIP). In addition to flood control, recreation and fishery <br />benefits, Navaj o Reservoir is operated primarily to provide water to the NIlP, an extensive <br />irrigation project constructed by the USBR and administered by the Navajo Agricultural <br />Products Industry (NAPI). The N1IP was authorized in 1962 to provide full service irrigation to <br />approximately 110,630 acres of land owned by the Navaj o Nation in northwest New Mexico <br />on the south side of the San Juan River, generally between Kutz Canyon and the Chaco River. <br />Construction of the NIIP began in 1973 and the first irrigation deliveries were made in 1976. <br />The project is constructed in blocks of approximately 8,000 to 10,000 acres, developed as <br />congressional appropriations are available. As of 1995, blocks 1 - 7 are operational and are <br />receiving irrigation water; blocks 1 - 7 contain an estimated 63,450 acres of irrigable land. The <br />Gallegos Pumping Plant, which is currently under construction, will enable additional <br />deliveries of irrigation water to higher elevation ground in blocks 8 - 11, which constitute the <br />remainder of the irrigated land. <br />Diversions for the NIIP are made directly from Navajo Reservoir through a headworks <br />operated by the NAPI. At full development, the average diversions from the reservoir are <br />expected to range from 360,000 to 385,000 acre-feet per year (3.25 to 3.50 acre-feet/acre). <br />During the CRDSS study period, the historical diversions to the NIIP, recorded by the USBR, <br />ranged from approximately 33,463 acre-feet in water year 1976 to about 150,930 acre-feet for <br />water year 1991. These historical monthly deliveries are incorporated into the San Juan Model. <br />For future modeling scenarios, at full development of the NIlP, the following monthly <br />diversions from Navajo Reservoir are included, based on recommendations of the USBR: <br />San Juan & Dolores River Basin Information 2-23 <br />
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