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The Waiwhetu aquifer covers a wedge-shaped area of 75 km² under the Hutt Valley and Wellington Harbour, and by size is the fifth-largest in New Zealand. [1] The harbour basin contains massive quantities of gravel washed down from the Hutt River, in some places hundreds of metres deep.
The Hutt River (Māori: Te Awa Kairangi, Te Wai o Orutu or Heretaunga; officially Te Awa Kairangi / Hutt River) flows through the southern North Island of New Zealand.It flows south-west from the southern Tararua Range for 56 kilometres (35 mi), forming a number of fertile floodplains, including Kaitoke, central Upper Hutt and Lower Hutt.
An Upper Hutt councillor claimed that the state of the water network in the city was the result of decades of under-investment, and that the city was currently only replacing 1.5 km (0.93 mi) of water mains each year. The Upper Hutt mayor Wayne Guppy disputed the claims and said that he had "no confidence" in Wellington Water and its advice. [27]
Water from the Hutt River starts to flow underground around Taita Gorge. From Melling southwards, the water becomes naturally pressurised beneath a layer of hard clay. This pressurised zone is estimated to be up to 70 metres thick at its western edge against the Wellington fault line, and 20 metres thick at the eastern edge of the harbour.
The Hutt River Board called tenders in November 1925 for clearing the upper reaches of the stream. [38] In 1928, the Hutt River Board agreed to the clearing of the stream between the road bridge and the outlet. [39] Later in 1929, the Hutt River Board commenced work on deepening and clearing the outlet of the stream. [40] [41]
From the river mouth, walking and cycling trails and grassed areas occur at various points along both sides of the river up the Hutt Valley to Te Mārua, 28 km further north in Upper Hutt. With lower river-levels in mid-summer, algal blooms have contributed to making slow-flowing areas anoxic. The Regional Council has cited the algal blooms as ...
The water level in Wellington Harbour was much lower 20,000 years ago, and the ancient Hutt River used to flow down a paleochannel to the east of Matiu / Somes Island as far as the present-day Miramar Peninsula.
The land is a flood plain of the Hutt River. To allow building on the site, the proposal was to raise the level of the land by 3 m (9.8 ft), requiring the placement of 550,000 m 3 (19,000,000 cu ft) of fill, in a project that would take at least 7 years and potentially have a major impact on the planted area. [12]