The user spits out a great volume of water from their mouth, swallowing up and crushing the enemy with the advancing surge. The user can ride the wave, allowing them to move at high speed, and attack the enemy, now swept off their feet, without fear of counter-attacks. The amount of water created is proportional to the amount of chakra used; when used with Kisame's enormous chakra, even a dry wasteland can become a small ocean. Afterwards, the excess water can be used for additional Water Release techniques.
In the anime, Nagato seemingly used this through the Deva Path by punching the ground causing water to gush out of the ground instead of spitting it out of his mouth.