| Summary: | Removal of sediments from dam reservoirs is an important task for water resources management. The pressurized flushing is a more common way for the evacuation of sediments. The present study experimentally investigates a case of a single pile installed upstream of the orifice to improve the pressurized flushing efficiency. In this regard, five pile cross-section configurations, namely circular, face-on square, corner-on square, corner-on triangular, and side-on triangular, were studied here. The piles were placed at four different distances (4.9, 8.4, 11.9, and 15.4 cm) upstream of the orifice. The results showed that the piles were the most effective when installed with a minimum distance. Furthermore, the flushing cone expanded in volume by increasing the output discharge. The highest increase in the flushing cone volume (671% relative to the control configuration without pile) at a fixed discharge rate was obtained with the corner-on triangular pile. The second highest expansion of the flushing cone volume (362% relative to the control configuration) was obtained with the face-on square pile. Furthermore, at 57% higher than the control case, the circular pile realized the least increase in the flushing cone volume.
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