Impacts of the 14th November 2016 Kaikōura earthquake on three waters systems in Wellington, Marlborough and Kaikōura, New Zealand

Preliminary observations

Authors

  • Matthew W. Hughes University of Canterbury, Christchurch, New Zealand
  • Mostafa Nayyerloo GNS Science, Lower Hutt, New Zealand
  • Xavier Bellagamba University of Canterbury, Christchurch, New Zealand
  • Jonathan Morris Opus International Consultants Limited, Wellington, New Zealand
  • Pathmanathan Brabhaharan Opus International Consultants Limited, Wellington, New Zealand
  • Stephen Rooney Marlborough District Council, Blenheim, New Zealand
  • Erica Hobbs Marlborough District Council, Blenheim, New Zealand
  • Keith Woolley Wellington Water, Wellington, New Zealand
  • Steve Hutchison Wellington Water, Wellington, New Zealand

DOI:

https://doi.org/10.5459/bnzsee.50.2.306-317

Abstract

We present preliminary observations on three waters impacts from the Mw7.8 14th November 2016 Kaikōura Earthquake on wider metropolitan Wellington, urban and rural Marlborough, and in Kaikōura township. Three waters systems in these areas experienced widespread and significant transient ground deformation in response to seismic shaking, with localised permanent ground deformation via liquefaction and lateral spreading. In Wellington, potable water quality was impacted temporarily by increased turbidity, and significant water losses occurred due to damaged pipes at the port. The Seaview and Porirua wastewater treatment plants sustained damage to clarifier tanks from water seiching, and increased water infiltration to the wastewater system occurred. Most failure modes in urban Marlborough were similar to the 2010-2011 Canterbury Earthquake Sequence; however some rural water tanks experienced rotational and translational movements, highlighting importance of flexible pipe connections. In Kaikōura, damage to reservoirs and pipes led to loss of water supply and compromised firefighting capability. Wastewater damage led to environmental contamination, and necessitated restrictions on greywater entry into the system to minimise flows. Damage to these systems necessitated the importation of tankered and bottled water, boil water notices and chlorination of the system, and importation of portaloos and chemical toilets. Stormwater infrastructure such as road drainage channels was also damaged, which could compromise condition of underlying road materials. Good operational asset management practices (current and accurate information, renewals, appreciation of criticality, good system knowledge and practical contingency plans) helped improve system resilience, and having robust emergency management centres and accurate Geographic Information System data allowed effective response coordination. Minimal damage to the wider built environment facilitated system inspections. Note Future research will include detailed geospatial assessments of seismic demand on these systems and attendant modes of failure, levels of service restoration, and collaborative development of resilience measures.

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Published

30-06-2017

How to Cite

Hughes, M. W., Nayyerloo, M., Bellagamba, X., Morris, J., Brabhaharan, P., Rooney, S., Hobbs, E., Woolley, K., & Hutchison, S. (2017). Impacts of the 14th November 2016 Kaikōura earthquake on three waters systems in Wellington, Marlborough and Kaikōura, New Zealand: Preliminary observations. Bulletin of the New Zealand Society for Earthquake Engineering, 50(2), 306–317. https://doi.org/10.5459/bnzsee.50.2.306-317