BOARD00083 ‎(2)‎

• Board Meeting Date: 11/14/2006
• Description: ISF Section - Notice of 2007 Instream Flow Recommendations in Water Divisions 2,3,4, and 6
• Board Meetings - Doc Type: Memo

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In addition. StatT is not moving forward with the Town of Minturn's recommendation on the Eagle River __._
in order to provide additional time for the water availability analysis. The water right issues are complex
and as a result staff is having the proposed reach modeled with the newly revised and enhanced Colorado
River Decision Support System (CDSS). Staff expects that this modeling exercise will help shed some
light on water availability and the effects of an expanded ISF on existing decreed river operations as well
as future potential operations.

StaWs previous attempts at modeling the reach this past year were inconclusive as the existing model did
not allow for a daily analysis of water rights. The CDSS now has the ability to model a daily time step.
In addition, CDSS modelers now have a better understanding of operations on the Colorado River which
will allow for a more accurate modeling exercise. Furthermore, at the October 23, 2006 stakeholder
meeting regarding this recommendation, staff became aware of an existing model prepared by Colorado
Springs Utilities which may aid in these modeling efforts.

Staff will continue to involve the Board, Division 5 Engineer, and stakeholders in its analysis and
modeling efforts to insure the accuracy of the input parameters and assumptions for various model runs.
Tn addition, Staff will provide all interested parties with the model results once they are finalized. Staff
does not currently have a time table for completion of the modeling exercise.

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Flood Protcction . Watcr Project Planni,ng and Financc . Stream and Lakc Protection
Water Supply Protection. Conservation Planning