Gisborne is in water ''crisis'' after a water main ruptured.
The pipe from the North Island east coast city's Mangapoike Dams burst yesterday afternoon when the hillside slipped around it, deputy chief executive Peter Higgs said.
In a typical day at this time of year, 21,000 cubic metres of water was used in Gisborne.
The city's other supplies - Te Arai bush catchment and the Waipaoa Water Treatment Plant - could only supply 14,000 cubic metres of water a day between them.
When industry returned in full on Monday, demand was expected to reach 28,000 cubic metres - twice what could be supplied.
A temporary fix was expected to take about two weeks, Mr Higgs said.
''Crisis is not an over-reaction.''
All non-essential water use such as sprinklers, irrigation, and car washing had been banned.
The slip was on a roadway and was about 70 metres long.
It was not clear how long a permanent repair would take.
- The Dominion Post
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