System Rehabilitation

• Phased design and construction
• Pumping plant rehabilitation
• 1 mile 96-inch diameter pipeline
• New structures
• Connection between San Joaquin River and the Delta Mendota Canal south of the Delta
• Feasibility Study
• Constructability evaluation
• Coordination with District Board
• Alternative analysis
• Cash Flow analysis

Banta-Carbona Irrigation District’s lift canal system provides its customers with irrigation water for agricultural purposes. The 85-year old system provides a connection between the San Joaquin River and the Delta Mendota Canal (DMC). The system consists of seven pumping stations and approximately seven miles of canals and pipelines.

Dahl Consultants is serving as the District’s Engineer to develop and analyze alternatives for project rehabilitation or replacement. As part of this effort, Dahl Consultants developed a Pre-Design Report that included alignment analysis, constructability assessment, hydraulic and energy analysis, permitting evaluations, and a draft cost estimate and schedule. In order to maximize District resources, a cash flow model was developed to evaluate District income and capital expenses over different time schedules.

From this study, the District decided to move forward with a phased approach for replacement of its aging facilities. Phase 1 included a new pumping plant capable of delivering 200 cfs through a new 1-mile long, 96-inch diameter pipeline (planned for Phase 2) connected to the DMC. Future phases will include additional improvements to the other four pumping plants as well as various canal improvements, thereby increasing and improving the capacity of the entire system.

Dahl Consultants is serving as project manager for the Lift Canal Rehabilitation Project and as the Construction Manager during construction of the new Pumping Plant 5 Wet Well completed in 2010. Since the new pump station is located “in-line” in the system, the pump station had to be constructed during the winter dry up period. The short duration for construction required close coordination between the District, Dahl Consultants, and the Contractor. Because this project is phased, the wet well structure was designed to include enough bays for nine pumps while allowing District water to pass through until system construction is complete.