Plunge pool 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 is created by the erosional forces of cascading water on the rocks at formation's base where the water impacts. The term may refer to the water occupying the depression, or the depression itself. Plunge pools are formed by the natural force of falling water, such as at a waterfall or cascade; they also result from man-made structures such as some spillway designs. Plunge pools are often very deep, generally related to the
Perilous Plunge Perilous Plunge Perilous Plunge was a shoot-the-Chutes style attraction located at Knott's Berry Farm in Buena Park, California. The ride opened on September 15, 2000, and closed on September 3, 2012. The attraction was based on the pleasure piers of the past along Southern California's famed beaches such as Huntington Beach. 24-passenger boats were towed to a height of where a brief U-turn was taken before a world record water chute into a 650,000-gallon "splashdown" lagoon. On August 13, 2012, Knott's Berry Farm announced that Perilous Plunge would be closing for good on September 3, 2012, in order to make