New reservoirs for Porirua
‘‘It makes more sense to have two reservoirs – one on either side of the fault line.’’
Planning is under way to improve Porirua’s water supply with two new reservoirs.
The city’s water supply would be particularly vulnerable if an earthquake hit, because it comes from the Hutt Valley through a single pipeline.
The Ohariu Fault runs through the middle of the city, separating residents on the west side.
A Wellington Water spokesman said that, along with encouraging each resident to store 20 litres of water for each of seven days, two big reservoirs should be built to sustain the city in the wake of disaster.
‘‘On the east side of the Ohariu faultline, a new reservoir with a 11.3-million-litre capacity is proposed at Aotea next to the two existing water reservoirs.
‘‘This reservoir would service the wider Kenepuru, CBD and Ranui Heights, Porirua East and Cannons Creek areas.
‘‘On the west side a smaller reservoir with about a 3 to 5-millionlitre capacity is proposed in the general Takapu¯wa¯hia area. This reservoir would service the wider Titahi Bay area.’’
The reservoirs should improve the city’s resilience to an earthquake, reduce disruption on a day-to-day basis and provide for future population growth.
‘‘Originally, we were looking at one site for a single reservoir.
‘‘However, it makes more sense to have two reservoirs – one on either side of the fault line – to lessen the risk that parts of the city are left without water supply for long periods after a disaster situation.’’
Wellington Water will engage with the community later this year.
The proposed Aotea site is likely to be constructed first.
Residents can buy 200-litre tanks directly from Porirua City Council.