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WSP00139
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Last modified
1/26/2010 12:12:57 PM
Creation date
10/11/2006 9:32:43 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8443.600
Description
Narrows Unit - Studies
State
CO
Basin
South Platte
Water Division
1
Date
2/1/1978
Author
US DoI BoR
Title
Special Report Investigation of Review Issues Narrows Unit - Colorado Pick-Sloan Missouri Basin Program
Water Supply Pro - Doc Type
Report/Study
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<br />SUMMARY <br /> <br /> <br />REVIEW ISSUE INVESTIGATIONS <br /> <br />The following is a summary of the results of investigations which <br />have taken place since the President's Water Resource Projects <br />Review in April 1977. The investigations were carried out by the <br />Lower Missouri Region of the Bureau of Reclamation with assistance of <br />the Bureau's Engineering and Research Center and various other Federal <br />and State agencies. <br /> <br />Safety of Narrows Dam and Reservoir Seepage <br /> <br />The results of stability analysis and foundation studies accomplished <br />by the Engineering and Research Center indicate that a safe dam can <br />be constructed at the Narrows site. In addition, an independent safety <br />review panel has conducted an independent review of the foundation <br />geology, foundation seepage problems, and feasibility embankment <br />design, and concluded that a safe dam can be built at the Narrows Dam <br />site using state-of-the-art techniques. The panel members agreed that <br />some of Reclamation's foundation seepage analysis assumptions were <br />unduly pessimistic and may have led to overly conservative conclusions. <br />A summary of the panel's oral briefing is included in the appended <br />materials, In addition, letters from individual panel members are <br />appended, which confirm that a safe dam can be constructed and that <br />the panel members arei n agreement on the fi nd i ngs. <br /> <br />Studies to date by the Geological Survey concerning the seepage <br />potential from Narrows Dam and Reservoir indicate seepage rates below <br />the estimates made by the Bureau of Reclamation. Final results from <br />the "transient" study will be published by the Geological Survey in <br />November 1978. Preliminary results indicate that the seepage rates in <br />the "transient" state would be less than the steady-state, <br /> <br />Flood Contro 1 <br /> <br />A report has been prepared by the Corps of Engineers reviewing their <br />estimate of the flood control benefits of the Narrows Unit. The Narrows <br />Unit woul d reduce downstream flood damage potenti a 1 by 16 percent taking <br />into account the effect of upstream impoundments, Bijou Creek is not <br /> <br />....1 <br />I <br /> <br />",. .. ',' '-,,",' <br />
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