© Jeremy Foster
The original 30-inch pipeline that carried water from Wainuiomata to Wellington began near Whitcher Grove, just west of Coleman’s Tunnel, and connected directly into the city’s main distribution network. Upstream of this point, however, a 2-kilometre section relied on a water race, which conveyed water from the Lower Dam before feeding into the 30-inch pipe. In 1902 the water race was decommissioned and replaced by a new 30-inch pipeline running directly from the Lower Dam to the already established pipeline. A Venturi meter was installed to measure the flow of water through this pipeline.
Starting around 1986, the 30-inch pipeline was gradually phased out and replaced by the Green Pipeline.
