Author(s): R. Cai; P. K. Sinha
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Keywords: Stepped spillway; Side channel; Apron; End sill; Baffle blocks
Abstract: The spillway configuration at Nandoni dam is relatively complex with a side channel as well as a component discharging directly into the river. The hydraulic performance of the spillway was investigated using a three-dimensional and undistorded 1:50 scale physical model. The spillway energy dissipation works were developed and refined during the model study with the aim of minimising downstream flow velocities and reducing the possibility of river bed and bank scour to acceptable levels. A satisfactory solution was found for the undesirable, unbalanced hydraulic conditions directly downstream of the apron/stilling basin, i.e. a two – level spillway crest and a shortened retaining wall for the side channel plus a series of baffle blocks inside the apron and side channel.
Year: 2001