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
Big Chute Marine Railway again made to build three locks at Big Chute, to be part of a new section of canal which would take boats from Big Chute and rejoin the existing waterway downstream from the Little Chute, avoiding the fast water in the Little Chute. However because of the post-war recession the scheme was put on hold once more, although remains of the beginning of the dams required to maintain the water levels can still be found in the surrounding forest. In 1923, the original railway at Big Chute was replaced, as the size and number of boats had increased, with the