Please note that this is the Narutopedia's article on the ninjutsu used by Yahiko. If you are looking for the article on the ninjutsu used by Kurotsuchi then you should head to Water Release: Water Trumpet.
The Water Release: Wild Water Wave is a basic Water Release technique which has many variations. Water gushes from the user's mouth like a waterfall and washes away the enemy. One can freely control the power of this technique with the amount chakra one releases.