Abstract: Flow on the Xujiaya spillway is featured with a low Froude number and inadequate energy
dissipation that is a common problem in similar projects. Another factor that worsens the flow condition to a
certain extent is the bend downstream the spillway inlet. To find a reasonable energy dissipation scheme, a
model spillway was experimentally tested to modify the original design and optimize its energy dissipation
effects. Three types of schemes were compared: single-stage stilling basin, two-stage stilling basin, and
trajectory bucket. The effects of energy dissipation and flow regimes in each scheme were optimized
through testing and examining different design alternatives, and the trajectory bucket design was finalized as
the economic and reasonable energy dissipation scheme for this reservoir spillway.