Seite - 1069 - in Book of Full Papers - Symposium Hydro Engineering

Figure 10: Results from CFD-calculations with preferred design (left) and the alternative design (right), (Norconsult, 2015). The results show that the alternative design, with a more diverging shape downstream, generates a larger eddy that compresses the jet. This leads to higher velocities and thus, less effective energy dissipation in the stilling basin. However, it was concluded that the increased velocity was acceptable, and the alternative design was approved. Figure 9: Left: Preferred design of spillway channel / stilling basin. Right: Alternative design, due to request for rock excavation (Norconsult, 2015. 1069