DACL System Dynamic Performance. II: Laboratory Model Testing

Abstract

This paper examines the dynamic performance of the dual‐acting controlled‐leak (DACL) system. The methodology and results of tests conducted on a DACL laboratory model configured for downstream control are reported. Water‐level responses in the controlled reach of the secondary channel to nominal step input changes in both the primary‐channel water level and set‐point level were measured. Laboratory test results showed that final values of the actual responses came to within about 1 mm of the predicted final values. This is in accord with control theory and previous findings that DACL systems can control water levels to within very narrow band widths. Use of the system response equations in the design of an irrigation turnout is demonstrated.