10825 Water Supply Alternative Summary Phase 2 Assessment January 2008 Draft

• Description: A report from the Grand River Consulting Corporation on alternatives for delivering 10,825 AF of water to the 15-mile reach of the Colorado River.
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/2008
• Author: Grand River Consulting Corporation
• Title: 10825 Water Supply Alternative Summary Phase 2 Assessment January 2008 Draft
• Water Supply Pro - Doc Type: Report/Study

Phase 1 of the alternatives assessment was a "preliminary screening" evaluation. A total of 15
potential 10825 facilities or alternatives that were identified in early 2007 were evaluated and
compared at a reconnaissance level. After consideration of the Phase 1 study results, five of the
initial concepts were determined by the 10825 Steering Committee to not warrant further study
or consideration in the Phase 2 assessment.
This study provides information regarding the viability, environmental impacts, issues, and costs
of potential 10825 Water supply alternatives and facilities. The specific facilities recommended
for further analysis in the Phase 1 study have been assessed. Also, at the direction of the 10825
Steering Committee, additional elements and combinations of facilities that had not been
considered in Phase 1 were added to the Phase 2 scope of study. In total, more than 20
alternatives, facilities (including structural and non - structural components), and combinations of
facilities have been evaluated in this study. The location of each 10825 facility that has been
evaluated is identified on the vicinity map in the front of this summary report.
Information from the Phase 2 Assessment is intended to facilitate the selection of a preferred
alternative or group of alternatives that can be supported by both West Slope and East Slope
water providers. A website with project notes, technical memoranda, engineering reports, and
environmental reports that have been prepared by the study team is available at
www.grandriver.us /10825. Background material on the Recovery Program and an extensive file
reference library with material related to specific facilities is available to all interested parties via
this project website.
1.2 OBJECTIVES FOR 10825 WATER SUPPLY ALTERNATIVES
The primary objectives of each 10825 Water supply alternatives are to:
• Permanently supply 10,825 acre feet of water during the late summer
and fall months in all years, including dry years
• Not impair or reduce the water supply available to any West Slope or
East Slope Water provider
Secondary considerations in the study included developing alternatives that would benefit
and /or have minor negative impacts on the headwater streams in the Colorado River Basin.
Some of the alternatives outlined in this report meet this secondary objective better than
others.
A key component of the 10825 Water Supply Study process was that the preferred alternatives
must be supported by the stakeholders in the study process. The most promising alternatives
that meet BOTH the primary objectives AND the secondary considerations are most likely to
have support by the stakeholders in this process.
10325 WatK Supply Study Phase 2 Alternativos Assessment January 2008 Draft 2