WSP12980

• File Number: 8210.140.20.C
• Description: Imperial Irrigation District ‎(IID)‎
• State: CA
• Basin: Colorado Mainstem
• Date: 1/9/1996
• Author: Imperial Irrigation District
• Title: Water Requirements and Availability Sutdy ‎(draft)‎
• Water Supply Pro - Doc Type: Publication

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4. Evaporation reduced from the reduced water surface area.
5. Accuracy of flow measurement increased.

Approximately 24,150 acre-feet of water were conserved in 1994 from the concrete lining of
199.5 miles of laterals as part of the MWD/IID Water Conservation Agreement. (Project 7.
Lateral Canal Lining, CVC, Table A-6, Appendix A.)

Realizing that the amount of seepage for each unlined lateral varies with the permeability of soil
present at each site, lID commissioned CH2M Hill to complete a study that would identify the
potential water savings for the remaining unlined laterals within the District. Based on this
study, 57.5 miles were identified as technically and economically feasible to line. Concrete
lining the 57.5 miles of laterals would conserve approximately 4,342 acre-feet of water per year.
Based on the District's concrete lining efforts over the past five years, the time required to
concrete line the 57.5 miles of identified laterals is estimated at one year.

Additional main canal segments that could potentially be lined for water conservation are:

1. All-American Canal, downstream of Drop 3, approximately 30 miles
2. East Highline Canal, approximately 45 miles
3. Central Main Canal, approximately 30 miles
4. Wests ide Main Canal, from the AAC to Trifolium Lateral 10, approximately 35 miles
5. Rositas Supply Canal, remaining unlined, approximately 9 miles
6. Vail Supply Canal, between the East Highline and the Alamo River, approximately
11 miles

The conservation potential of each segment was analyzed by the United States Bureau of
Reclamation (USBR) in 1984. (Water Conservation Opportunities Imperial Irrigation District,
USBR, July 1984.) Subsequent evaluations have been conducted on several main canal
segments since 1984 and are included in the following discussion.

Additional concrete lining along the All-American Canal (AAC) could conserve an additional
estimated 14,000 acre-feet of water per year. However, two factors severely limit opportunities
for additional lining:

Draft: Subject To Revision 12/21/95

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