cut into the centre of the floor The section immediately upstream of Hunter St was built as oviform. This included a terra cotta flow channel. The next section upstream was also constructed. It was a bottom only oviform, and part of it was built underneath an existing stone arch bridge. 1880: Brick oviform was constructed for the full width of King St and terminating. 1898: SPS [Sewerage Pumping Station] 16 constructed. the section immediately downstream of the interception chamber, has an interception pipe leading to SPS 16 form the tidal weir. 1940: Section just upstream of Martin Place was replaced with concrete pipe under the GPO in 1940. This replaced 1866 brick oviform. 1951: Stormwater drainages charges were introduced for parts of the City of Sydney from 16 November 1951. 1958: Replacement, at the rear of 105-107 Pitt St. 1962: Replacement, at rear of Commercial Union House [south end of Pitt St.] 1965: Replacement within Australia Square. Construction of Tank Stream visitor access space. 1975: Replacement within basement of New Zealand Insurance Building [North of Bond St.] 2001: Replacement in Former GPO site. 2002: Replacement within Angel Place project. Tourism Tank Stream tours are run by the Sydney Living Museums and Sydney Water. These are usually in April and November. The tickets are limited and allocated by ballot. There is an information centre behind locked gates at the beginning of the tour. One can also trace the previous stream course following art work, street names, and pub names. The Tank Stream has been commemorated in a sculpture by Stephen Walker, created in 1981. The sculpture, known as the Tank Stream Fountain, is located at Circular Quay. Heritage listing As at 31 May 2006, The Tank Stream is significant because it was the reason the First Fleet settlement was established in Sydney Cove, and therefore influenced the future shape of Sydney over two centuries. It is linked in the public mind with the period of first European settlement and retains value as an iconic representation of that period and is interpreted as a metaphor of the period of contact and early urban settlement in Australia. The Tank Stream itself has retained an identity through the functional changes from being a fresh water supply, through subsequent use as combined sewer and stormwater drain to its current function as a stormwater drain. It is an important survivor of the first period of organised