The Bear River Canal is an approximately 22-mile-long canal that conveys water from Colfax to Auburn, CA, with a capacity of 450 cubic feet per second (cfs).
Three spillways are critical to control the flow of the canal, particularly during rainfall events. Although there are several alarm stations located along the canal that monitor flow, our client wanted more accurate flow monitoring devices upstream and downstream of the aforementioned spills, with the ultimate goal of monitoring the spillway discharge volume.
SAGE contracted with a subconsultant to complete detailed canal hydraulic analysis considering the effects of spillway opening on the canal flow. The analyses determined the resulting zone of influence within the canal from a spill event. SAGE completed Quality Control review of the analysis and used the data to locate new flow monitoring stations along the canal that could be installed outside the estimate zone of influence.
Two float wells were added at each site, one upstream and one downstream of each spillway gate. The new wells quantify flow into and past the gates, with the difference used to estimate the volumes discharged through the spillway gates. Rating curves (flow versus head) were developed so that discharge from the spillways can be estimated from the SCADA/RTU data acquired upstream and downstream of the gates. The combined data from the two curves will quantify spillway flows, as well as monitor the canals for unanticipated spillway releases.
SAGE completed the civil design and layout drawings for the installation of the new stilling wells and flow metering stations. Work included detailed engineering and design of the stilling wells and appurtenant features; conduit routing and installation details; post design support including construction observation and coordination with the client; testing and startup; As-Built plan preparation; development of the rating curves, including measurement of canal flows to calibrate the rating curves; and project management.