Here at this point there is two waterfalls one is of a modern desigh which keeps the water flowing but in a slow steady amount, The other Fall is the original Victorian water fall which was built sometime between 1873 and 1899 the date i am not 100% on as the park was originally opened in 1873 but one of the bridges further down in the dingle from here was placed in 1899.
By going after this cache you take your own health and saftey at your risk I have placed the dificulty level at a D4T3 as it will become extremely difficult when the fall is turned on. you may need waterproof clothing for this as the cache is placed in a crevice/recess that is quite visible when the water is off but you will get wet if retrieving when on.
Happy Hunting