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Irrigation Canal Enclosure

Irrigation, Water, Geotechnical, Environmental, Construction


Sunnyside, WA

Sunnyside Valley Irrigation District


Irrigation, Water, Geotechnical, Environmental, Construction



The Sunnyside Valley Irrigation District Enclosed Lateral Improvement Projects (ELIPS) 2009-2010 laterals consisted of the installation of approximately 18.5 miles of pipeline, converting open channel irrigation ditches into enclosed pressurized irrigation mains. RH2 assisted in design, bidding, and construction inspection of the project on a very condensed timeline. The project was designed in only two months and installed in only four months.

Irrigation mains were required to be constructed through the winter to maintain services to all customers during the irrigation season. During design, our in-house team performed hydraulic modeling to size and calculate peak conditions. The project included significant rock excavation, dewatering, multiple highway and railroad crossings, and interstate crossings. Multiple pipe sizes and materials were utilized to meet design conditions, including pipe as large as 36 inches in diameter, as well as HDPE and PVC materials.

The project was funded under the federal American Recovery and Reinvestment Act stimulus, was constructed across two separate counties, and involved coordination with numerous agencies and jurisdictions. The pipeline provides local land owners with a new pressurized system that is completely metered from source to distribution, ultimately conserving water lost to evaporation, seepage, and open channel inefficiencies.

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