In what situation may the backroller effect of a low-head dam be found far downstream?

The backroller effect of a low-head dam can indeed extend far downstream during high water conditions. This phenomenon occurs because, during periods of elevated water flow, the increased volume and velocity of water can create more significant turbulence and pull from the dam. As water flows over the dam, it can generate powerful whirlpools and strong currents that can extend downstream.

In high water conditions, the energy of the water increases, leading to more pronounced effects caused by the dam, such as the backroller effect, which can make the water behave erratically downstream as it interacts with the natural flow of the river. Thus, it is critical for boaters to be aware of potential hazards even at a considerable distance from the low-head dam.