This cache is best done at the same time as Kew Fish hatchery GC4BENG as they both refer to the same period in history for this area.
The hill you are standing on used to be referred to as “Reservoir Hill”. Why? Well in mid 19th Century under Governor Latrobe a reservoir was built here to supply water under pressure to the Botanical Gardens and Albert Park Lake. When the Fish Hatchery was built it also supplied a constant flow for fresh water to it.
The water was pumped up from Dight’s Falls on the Yarra River. Dights Falls is an artificial weir built on a natural rock bar across the Yarra. The weir was built in the 1840s to provide water to the 'Ceres' flour mill, one of the first in Victoria. If you walk to the bottom of Walmer St you will find a foot bridge that was built as a means to take the water main for the supply of the Botanical Gardens and Albert Park Lake over the-river.
In 1876 William Guilfoyle, the second Director of the Royal Botanic Gardens Melbourne, oversaw the construction of a bluestone reservoir at the highest point of the Gardens. The reservoir was styled in the form of a volcanic crater to provide gravity-fed irrigation for the Gardens. This feature of the Botanical Gardens still exists today and was where the water from Reservoir Hill went to.