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Last modified
1/26/2010 12:29:20 PM
Creation date
10/11/2006 10:10:22 PM
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
3/11/2002
Title
Navajo Dam EIS-New Mexico Interstate Stream Commission Detailed Comments
Water Supply Pro - Doc Type
Report/Study
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<br />Line 174. Replace "oo" with "was". <br /> <br />Lines 175-176. Delete "n is assumed to be maintained". <br /> <br />Line 186. Replace "." with "in the reach of critical habitat downstream from the confluence of the <br />San Juan and Animas rivers. The Flow Recommendations report contains operations rules decision <br />trees for Navajo Dam based on either 5000 cfs or 6000 cfs maximum release rates. Such rules <br />decision trees provide examples as to how Navajo Dam might be operated during the spring runoff <br />period within the limits of the specified minimum and maximum release rates to mimic a natural <br />hydrograph and meet the Flow Recommendations criteria for the San Juan River below Farmington. <br />However, while evaluation of the action alternatives in this Environmental Impact Statement <br />considers such operational parameters as examples, the action alternatives retain flexibility as to the <br />amount and timing of flow within the boundaries set by the minimum and maximum release rates." <br /> <br />Line 190. Replace ", in" with "and". <br /> <br />Lines I 90- I 9 I. Replace", and in order to include a wider range of alternatives, another four <br />alternatives were added" with "four additional alternatives were formulated". <br /> <br />Lines I 91-192. References in the ADElS to an alternative to decommission and breach Navajo Dam <br />should be deleted from the DEIS. <br /> <br />Line 197. Insert "provide for further water development in the San Juan River Basin and to" <br />preceding "mimic", and replace "to meet" with "meet". The minimum release rate of250 cfs under <br />the 250/5000 Alternative is proposed to conserve water both for water development and use in the <br />Basin and for endangered fish habitat needs. This change reflects the water supply conditions in the <br />Basin and the dual goals ofthe SJRBRlP. <br /> <br />Line 199. Replace ". Some" with ", and flexibility would be retained to adjust release rates within <br />this range to respond to new information as it becomes available and to water development needs <br />through adaptive management. The 250 cfs minimum release rate is consistent with the dam releases <br />that were anticipated under full demand on Navajo Reservoir in the Bureau ofIndian Affairs' 1955 <br />Feasibility Report for the Navajo Project. There are some" The 1955 Feasibility Report for the <br />Navajo Project estimated that based on the decreed water rights for diversions from the San Juan <br />River between Navajo Dam and Farmington, about 30,000 acre-feet per year, on average, of inflow <br />to Navajo Reservoir would need to be passed through the dam to satisfy the downstream direct flow <br />rights. Direct flow rights on the San Juan River downstream of Farmington were assumed to be <br />satisfied by diversion of return flows and inflow from the Animas River. The Feasibility Report also <br />estimated dam releases of23,000 acre-feet per year to meet the irrigation needs of the Hammond <br />Project. Releases totaling about 53,000 acre-feet over a seven-month irrigation season would <br />average about 127 cfs, but higher diversion rates would be necessary during the summer peak <br />irrigation periods. The decreed maximum diversion rates for all ditches between Navajo Dam and <br />Farmington totaled 168 cfs and the maximum diversion rate for the Hanunond Project was permitted <br />at 90 cfs, thus yielding a total maximum diversion demand of about 258 cfs, a portion of which <br />physically could be met from return flow. <br /> <br />16 <br />
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