A water slide (also referred to as flumes, water chutes, or hydroslides) is a type of slide designed for warm-weather or indoor recreational use at water parks.Water slides differ in their riding method and therefore size.Some slides require riders to sit directly on the slide, or on a raft or tube designed to be used with the slide.ater slides run into a swimming pool (often called a plunge pool) or a long run-out chute. A lifeguard is usually stationed at the top and the bottom of the slide, so that if a rider gets hurt they will be treated immediately.