My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
WSP00928
CWCB
>
Water Supply Protection
>
Backfile
>
1-1000
>
WSP00928
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/26/2010 12:28:30 PM
Creation date
10/11/2006 10:02:26 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
10/1/2001
Author
BOR
Title
Navajo Dam EIS-Biological Assessment-Preliminary Draft
Water Supply Pro - Doc Type
EIS
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
38
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />The second area of flexibility exists as full water development occurs. Minimum releases would <br />be 250 cfs, but existing flexibility within the endangered fish flow recommendations could allow <br />minimum summer releases to be above 250 cfs. During the Navajo Reservoir Operations <br />Meetings and in consultation with the Service, an operation plan to meet endangered fish flows, <br />authorized project purposes, and water development needs will be prepared. Unutilized or <br />unaccounted for water, resulting from the aforementioned variables, would be identified and used <br />'}.to increase summer releas~in only that particular year. . <br />Lv.>~ ^-'-~ ~,..".JcLe;; <br />Part of the proposea' action is to implement a process of "adaptive management," whereby the <br />effects of dam operations on endangered fish and their habitat and downstream resources would <br />be monitored and the results of that monitoring would form the basis for possible future tests or <br />modifications of dam operations and/or the flow recommendations. Through this process there <br />might be water identified in the system or operations that could be available at different times or <br />for other purposes than those contemplated herein. Adaptive management is already considered <br />within the flow recommendations, in that the flow recommendations may be adjusted as new <br />information is gained through monitoring arid research. <br /> <br />Impacts to be monitoredij:laf include effects of dam releases on endangered species habitats, <br />irrigation diversion facilities, the trout fishery, and the ability to implement water rights. The <br />concept of adaptive management is based on the recognized need for operational flexibility to <br />respond to future varying conditions, including weather, streamflow, channel morphology, and <br />other ecosystem components. <br /> <br />The adaptive management program will occur as part of Reclamation's existing Navajo <br />Operations Meetings which will provide an organization and process for cooperative integration <br />of dam operations, resource protection and management, and monitoring and research <br />information. These meetings will ensure that the EIS purpose and need are met through future <br />advances in information and resource management <br /> <br />FLOW RECOMMENDA nONS <br /> <br />Mimicry of a natural hydrograph is the basis of the flow recommendations for the San Juan <br />River. The recommendations provide flow variability that is necessary to create and maintain <br />habitat for the Colorado pikeminnow and razorback sucker. The recommendations integrate <br />hydrology, geomorphology, habitat, and biology to define flow magnitude, duration, and <br />frequency for the spring runoff and base flow periods. <br /> <br />In general the flow recommendations provide for a spring peak flow and a base flow at other <br />times of the year. For a complete description of the recommendations, Flow Recommendations <br />for the San Juan River prepared by the SJRBRIP (Holden, 1999), should be referred to. The <br />"...flow/duration/frequency recommendations will result in a naturally varying hydro graph, ' <br />providing high-flow and low-flow years. These recommendations also provide for adequate base <br />flow conditions and peak flow conditions of sufficient magnitude, duration, and frequency to <br /> <br />8 <br /> <br />00683 <br />
The URL can be used to link to this page
Your browser does not support the video tag.