In the last two months the City Council has begun placing a new
section on the Land Information Memorandum (LIM)
they issue, stating:
"Property or property within the Christchurch District
Plan Liquefaction Management Area overlay."
A LIM is a Council document with information about a property
typically used by a purchaser of a house or section.
The Council's decision to place this section in a LIM has
come about as a result of a decision by the Independent Hearings
Panel regarding the new Christchurch District Plan. The Panel's
decision is that most properties in Christchurch should be included
in a Liquefaction Management Area (LMA) in the
The properties in Christchurch now subject to a LMA
classification are all properties east of a line running from the
Waimakariri River to approximately Nunweek Park, Burnside High
School, Greers Road, Main South Road to the foot of the Port Hills.
The LMA includes Sumner, Redcliffs and Lyttelton but excludes the
The practical effect of a property being in the LMA is that the
Council is saying that the soils in the LMA generally have a
greater potential for liquefaction and that more detailed site
investigations may be required to determine the appropriateness of
a site for subdivision or building. However, being in the LMA only
triggers the need for a resource consent in limited situations. So
for the purpose of the District Plan the need for further
geotechnical investigation will occur only where a resource consent
is otherwise required for the proposed development.
The area within the LMA has been based on geotechnical
information based on whether liquefaction is more likely to occur
than not. Within the LMA, liquefaction risk and appropriate
mitigation will be assessed on a site specific basis using best
practice geotechnical and engineering methods to determine the
performance of infrastructure and buildings.
It is intended that the Council will create guidance documents
to detail the types of investigations required to determine the
suitability of a site for development. It will also create
performance standards so readers would know exactly what is
expected in terms of performance of the ground, or the design of
the structure, to withstand liquefaction.
The content of this article is intended to provide a general
guide to the subject matter. Specialist advice should be sought
about your specific circumstances.
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