The dissipation blocks and the little flip at the end are meant to be energy dissipation features to try and impact the river less. There are even dams with a giant flip ski jumping spllway.
The dam height here means the spillway has to be long and energy generated is huge.
Understood. I was specifically referring to the test designs, on the flow model bed, where there were variations of wings or funnel shapes just after the spillway gates. The hump has always bothered since the first time I stood at the base and looked up the spillway in 1982. Very few if any dams in the US have a spillway that long. Extra care should of been exercised in the design.