How does channel straightening, as a flood control measure, specifically affect the flood wave travel time and peak discharge downstream?

Channel straightening is the modification of a natural river course to reduce its sinuosity, meaning to make it less winding and more direct. This process typically involves excavating a new, straighter path for the river and often dredging the existing channel to improve its hydraulic efficiency. As a flood control measure, its primary objective is to accelerate the movement of water through a specific reach of the river. "Flood wave travel time" is the duration it takes for the leading edge of a flood, or a specific stage of rising water, to propagate from an upstream location to a downstream location along the river channel. Channel straightening directly impacts this by reducing the overall length of the river segme....