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WSP04151
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Last modified
1/26/2010 12:53:59 PM
Creation date
10/12/2006 12:10:57 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8276.120
Description
Grand Valley Unit-Colorado River Basin Salinity Control Project
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
5/23/1986
Title
Final Environmental Impact Statement: Grand Valley Unit Stage Two Development
Water Supply Pro - Doc Type
EIS
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<br />00 <br />r..o <br />o <br /><=> <br /> <br />,-~ <br />'- <br /> <br />SUMMARY (Continued) <br /> <br />,::.;,.-:C1 <br />:<.:< <br /> <br />be added to control the surface elevation of the canal water. <br />drainage facilities, consisting of a detention dike and ditch <br />would be constructed to protect the membrane-lined canal. <br /> <br />Cross- <br />system, <br /> <br />In addition to the moss and debris removal structure installed under <br />Stage One, two new structures would be installed to remove moss, debris, <br />and other material from the irrigation water and to prevent the buried <br />pipe laterals and measuring devices from clogging. <br /> <br />Lateral improvements generally would consist of replacing unlined <br />lateral reaches in the Stage Two area with buried pipe laterals that <br />approximately follow existing alignment and grade. Laterals already <br />lined would not be improved unless needed. Approximately 700 individual <br />laterals are included, with a total length of approximately 490 miles, <br />of which 308 miles (or 63 percent) are presently unlined and would there- <br />fore be placed in pipe. Pipe laterals would be installed in all cases <br />except those in which hydraulics prevent their use; in such cases, they <br />would probably be concrete lined. The pipe sections would range from 6 <br />to 48 inches in diameter. Existing structures, such as drops, road <br />crossings, flumes, turnouts, and canal headgates, would be removed or <br />replaced if necessary. <br /> <br />Wildlife measures, including acquisition of 2,090 acres of land <br />along the Colorado River, would be included to compensate for wildlife <br />habitat losses that could be expected to result from the canal and <br />lateral improvements for the entire Grand Valley Unit. <br /> <br />The recommended plan would reduce the salt loading from the unit <br />area by an estimated 143,500 tons annually. <br /> <br />Alternative A <br /> <br />Alternative A provides for membrane lining the same three reaches <br />of the Government Highline Canal as the recommended plan; however the <br />existing open earth laterals that would be placed in pipe under the <br />recommended plan would be concrete lined under alternative A. As with <br />the recommended plan, existing structures along the canal would need to <br />be evaluated as to their structural and hydraulic soundness and replaced <br />if necessary. Turnout structures would be replaced, and several new <br />wasteway and centerline check structures would be added to control the <br />surface elevation of the canal water. <br /> <br />Cross-drainage facilities would be the same as for the recommended <br />plan; however, in this plan, the laterals would be open and concrete <br />lined,so no moss and debris removal structures would be necessary. <br />Conversely, the use of open laterals would require additional safety <br />precautions, so safety fences would be installed along laterals adjacent <br />to schools and recreation areas that may be frequently visited by <br />children. Wildlife measures for alternative A would be the same as for <br />the recommended plan. <br /> <br />S-3 <br />
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