backrush
/ˈbækˌrʌʃ/Definitions
1. noun
A sudden, strong flow of water, especially from a dam or reservoir.
“The backrush from the newly opened dam caused widespread flooding in the nearby town.”
2. noun
A wave or swell of water that moves backward, especially when a boat or ship is heading upstream.
“The sailors struggled to navigate the boat through the powerful backrush of the river current.”