Effect of flow variability and sedimentation in a canal reach on turnouts, flow rate and lateral spill

Flow fluctuation in a canal reach occurs due to variation of flow rate at the headworks, by gate settings and by varying the water demands. These flow variations ultimately get transmitted to turnouts flow rate and lateral spill. The degree of non-uniformity in flow deliveries amongst the turnouts because of flow variability in a reach (due to various possible reasons) and sedimentation in a reach has been studied in a simple hypothetical canal system. Simulations of hydraulic parameters have been done using the model CANALMAN developed at Utah State University, USA. Structural and operational improvements which can bring reduction in the non-uniformity in flow distribution have also been discussed.