The Raging Rapids was an obstacle that appeared in the second season of Wipeout. It contained a wet ramp with running water that, when activated, it will try to wash contestants away with 1000 gallons of water. If the contestants kept their balance, they will stay on, but if the water is strong enough, they must start over back at the beginning. It is a one time deal obstacle.
This obstacle in one episode was mixed in blue colors so the water looked like water from the sea. Another episode had mud filled with the water.