Plunge pool softer or fractured rock has been eroded back to a knickpoint, water continues to bombard its base. Because this rock is often less resistant than overlying strata, the water from the higher elevation continues eroding downward until an equilibrium is achieved. A somewhat similar bowl-shaped feature developed by flowing water, as opposed to falling water, is known as a scour hole. These occur both naturally and as a result of bridge building. Plunge pool A plunge pool (or plunge basin or waterfall lake) is a deep depression in a stream bed at the base of a waterfall or shut-in. It
Coastline Plunge that takes them through a short enclosed tunnel. Once the tube exits the tunnel, it is taken up the side of the funnel part, going back and forth along the sides until it comes out the end through a water curtain into a splash pool, which it shares with Surge. Riders of this slide are also required to be no shorter than 48 inches. This is the only slide in the complex that is denoted as an "Aggressive Thrill Ride". Hyrdo is one of two slides added to Coastline Plunge in 2013. It is an orange slide in which riders