Plain Stilling Basin Performance below 30° and 50° Inclined Smooth and Stepped Chutes

Energy dissipators, such as stilling basins, are usually required at the toe of stepped chutes to achieve adequate and safe operation spillway. Stepped chute hydraulics has been extensively studied in last several decades, however, only limited knowledge is available on basin performance below chutes. In particular, effect slope remains unknown, despite being a central design issue. Therefore, an experimental campaign was performed using 30° or 50° inclined smooth with adjacent conventional plain basin. The results indicated that, within basin, surface characteristics roller well hydraulic jump lengths practically independent slope. This further strengthens previous findings that require 17% longer dimensionless consequently lengths. also confirmed generated increased extreme fluctuating bottom pressure entrance area. With increasing slope, latter were found significantly magnify. However, magnitudes not expected provoke cavitation damage inflows induced aeration entrance, irrespective