Water supplied to the main canal of the Wester Canal Water District (District) enters via two outlet structures located on the northwestern edge of the Thermalito Afterbay. Flow control structures along the canal are used to regulate water flow and maintain proper water levels. As recipients of state grant funds for water use efficiency and water management projects, the District hired SAGE to replace its leaking and eroding timber control structure, on its main canal, with a concrete weir and automated gates. SAGE collaborated with the District to size the structure and identify operational and functional requirements to be incorporated in our civil/structural design.
The new, approximately 10-foot-high gated elevation control structure spanning a 100-foot-wide canal, allows the District to reduce uncontrolled water loss and improve operations and efficiency. Installed just upstream of the existing timber structure, the new concrete weir includes two 18-foot-wide automated steel Langeman gates (by Aqua Systems 2000, Inc.).
SAGE’s engineering and consultation services included reviewing existing subsurface data provided by the District for a nearby siphon project, as well as published regional geologic and groundwater maps and soil surveys, to prepare geotechnical recommendations. SAGE generated complete PS&E construction documents and assisted the District in preparing bid documents for solicitation for construction.
SAGE also provided construction support, including reviewing and responding to contractor RFIs and material submittals, coordinating and consulting with the District, coordinating field observation schedules, and assessing excavated conditions to confirm consistency with our geotechnical recommendations.