Tumalo Feed Canal
Location: Bend, Oregon
Open canals are an inefficient means of transporting irrigation water. Much of the water is lost to evaporation, and irrigators historically received inadequate water in eight out of ten years using open canals. Further, open canals present a hazard to small children in rapidly urbanizing areas such as Deschutes County around Bend. Moving the water into underground pipes conserves water and increases both the amount of water and the pressure at which it is delivered to irrigators, as well as eliminating the hazards of surface canals. Another significant benefit of the piping project has been increased stream flows in Tumalo Creek and the Deschutes River, made possible by conservation. More than 20 cfs of conserved water has been permanently returned to these streams. Of the 20 cfs conserved in this project, 11.8 cfs (cubic feet per second) will remain in Tumalo Creek, one of the few sources of cold water in the Deschutes River system. This cold water enhances the habitat for existing species as well as the re-introduced mid-Columbia steelhead.
DEA provided extensive design and construction period services for the piping of Tumalo Irrigation District’s (TID’s) Tumalo Feed Canal. The first phase, completed in 2008, piped approximately 2,600 linear feet of open canal with 7.5-foot-diameter profile wall high-density polyethylene (HDPE) pipe and included the construction of three concrete transition structures. As a result of cost-effective design and construction, TID, DEA. and Weekly Bros. were able to lengthen the project by more than 20 percent. During Phase 2, DEA added a 90-inch-diameter, 3,200-foot-long section of pipe. The design process included hydraulic and structural analysis. DEA also helped prepare funding applications to several agencies to fund this project.