APPENDIX C
APPENDIX C
The Plains - area-wide suburb
technical land information
Lincoln
Prebbleton
Islington
15
Tai Tapu
0
1
2
3
4
A3 SCALE 1:100,000
5 (km)
Riccarton
8
Avondale
Burwood
Travis
Woolston
Hillsborough
Huntsbury
1:100,000
52020.0200
PREPARED BY TONKIN & TAYLOR LTD
PROJECT No.
SCALE (AT A3 SIZE)
ARCFILE
APPROVED
CHECKED
DRAWN
Scarborough
FIGURE No.
Map Reference Sheet
0
REV No.
Port Levy
!
TECHNICAL LAND INFORMATION
FACT SHEETS
Area-wide Suburbs
Diamond Harbour
Lyttelton
Moncks Spur
Sumner
Southshore
13
South
New Brighton
Clifton
Redcliffs
Mt Pleasant
Ferrymead
Aranui
Bexley
9
New Brighton
North
New Brighton
Heathcote
Bromley
St Andrews Hill
Opawa
12
St Martins
Waltham
Linwood
Phillipstown
North Linwood
Dallington
Wainoni
Richmond
Avonside
Shirley
Governors Bay
Cashmere
Somerfield
Beckenham
11
Sydenham
Spreydon
Addington
Location Plan
St Albans
7
Central City
Merivale
Papanui
5
Spencerville
3
Brooklands
Kairaki Beach
Pines Beach
2
Queenspark
Parklands Waimairi Beach
Westhaven
Ouruhia
Chaneys
Marshland
Mairehau
Redwood
Hoon Hay Valley
Westmorland
Hoon Hay
10
Middleton
Hillmorton
Halswell
14
Fendalton
Upper Riccarton
Ilam
Casebrook
Northcote
Bryndwr
6
Bishopdale
Burnside
Westlake
Oaklands
Wentworth Park
Hornby
Sockburn
Masham
Hei Hei
Riccarton Park
Russley
Avonhead
Hyde Park
Road Database supplied by Terralink International Ltd.
Rivers, lagoons and coastline licensed under Creative
Commons Attribution 3.0 New Zealand and sources from LINZ
Notes:
empleton
Yaldhurst
Harewood
Styx
4
Belfast
Bridgend
South Kaiapoi
North Kaiapoi
1
Kaiapoi Lakes
EARTHQUAKE COMMISSION: Canterbury Earthquakes 2010 and 2011 - Land report as at 29 February 2012
68
79
EARTHQUAKE COMMISSION: Canterbury Earthquakes 2010 and 2011 - Land report as at 29 February 2012
Factsheet 6 - Ilam to Bishopdale
Bishopdale, Bryndwr, Burnside, Fendalton and Ilam
6.1 Ground conditions and groundwater
over the following weeks. This mapping was supported by air-
Regional geology maps show this area is generally underlain
photo analysis for all four main earthquakes, and additional
by dominantly alluvial sand and silt overbank deposits.
regional or street-level mapping for the earthquakes of
Suburb
Ground elevation above sea level
Groundwater depth
13 June 2011 and 23 December 2011. This additional mapping
Bishopdale
Typically 16.4m to 18.2m (Avg 17.8m)
Typically 2.1m to 2.9m (Avg 2.5m)
indicated that the overall pattern of liquefaction and lateral
Bryndwr
Typically 11.3m to 16.7m (Avg 14.5m)
Typically 0.7m to 2.5m (Avg 1.8m)
spreading for the subsequent earthquakes was generally
Burnside
Typically 17.4m to 22.2m (Avg 19.8m)
Typically 2.0m to 3.6m (Avg 3.0m)
Fendalton
Typically 9.3m to 13.6m (Avg 11.4m)
Typically 0.4m to 1.4m (Avg 0.9m)
Ilam
Typically 13.7m to 18.2m (Avg 16.3m)
Typically 1.4m to 4.1m (Avg 2.6m)
property-by-property rapid mapping of liquefaction and
Table C6.2 summarises typical ground elevation and
lateral spread observations in this area. The observations
groundwater depths in the area (the values listed correspond
following the 4 September 2010 and 22 February 2011
to the 10th and 90th percentiles and the median). This was
earthquakes have been aggregated by assigning each
derived from LiDAR ground elevation survey commissioned
property the most severe observation from either of
by EQC in September 2011, and a groundwater surface
these two earthquakes. These observed liquefaction and
developed from recent EQC groundwater monitoring
lateral spread mapping colours have completely different
in conjunction with historic Environment Canterbury
meaning to the colour codes used by the Canterbury
groundwater data. This area is generally elevated well above
Earthquake Recovery Authority (Cera) for residential land
sea level with a shallow to moderate depth to groundwater.
zoning and the Department of Building and Housing (DBH)
for technical categories.
The ground conditions and groundwater in this area are
Bishopdale
3680
28%
48%
13%
11%
0%
<1%
0%
Bryndwr
3010
29%
49%
2%
19%
0%
1%
0%
Burnside
2247
94%
6%
0%
<1%
0%
<1%
0%
Suburb
generally similar to most of the southern, central and
Table C6.4 summarises the change in ground elevation
northern suburbs of Christchurch.
inferred from the LiDAR survey. The total change in ground
elevation which has occurred is a combination of regional
While ground surface disturbance has occurred in some
Table C6.3 - Summary of liquefaction and lateral spread observations for residential land, aggregated
from mapping undertaken following earthquakes of 4 September 2010 and 22 February 2011
Severe lateral spreading,
ejected material often
observed
sands and silts.
Moderate to major
lateral spreading, ejected
material often observed
Figure C6.1 and Table C6.3 present a summary of the
No lateral spreading,
but large quantities of
ejected material
profile in the area generally comprises very loose to dense
No lateral spreading, but
minor to moderate quantities
of ejected material
These investigations indicate that the near-surface soil
Minor ground cracking,
but no observed ejected
liquefied material
similar to that observed in the first two main earthquakes.
No observed ground
cracking or ejected
liquefied material
4 September 2010 and 22 February 2011 earthquakes.
Not mapped
investigations undertaken by EQC in this area following the
Total residential
property count
Table C6.1 summarises the area-wide subsurface ground
Table C6.2 - Summary of ground elevation and groundwater depth (September 2011)
areas (e.g. settlement, cracking and ejection of material),
uplift or subsidence due to fault movements (tectonics)
the underlying ground which liquefied appears to have now
and local ground subsidence due to liquefaction and related
returned to its pre-earthquake strength.
effects. The LiDAR is of limited accuracy (about ±100mm).
Fendalton
2699
2%
46%
5%
36%
<1%
10%
<1%
This means that the LiDAR is more suitable for measuring
Ilam
2335
73%
25%
<1%
1%
<1%
<1%
0%
6.2 Post-earthquake observations
large changes in ground elevation (greater than about 100
Rapid mapping of liquefaction and lateral spreading
to 200mm), and may not accurately represent areas where
observations was undertaken following the 4 September
only minor changes in ground elevation have occurred.
2010 and 22 February 2011 earthquakes, first on a regional
and street-by-street level in the days immediately after
Table C6.5 summarises the extent and severity of observed
each earthquake, and then on a property-by-property level
liquefaction and lateral spread.
Table C6.1 - Area-wide geotechnical investigations undertaken by EQC (December 2011)
Suburb
Number of cone
penetration tests
Number of
boreholes
Number of groundwater
standpipes
Length of MASW
geophysical testing (m)
Bishopdale
9
-
6
-
Bryndwr
14
2
8
-
Burnside
-
-
-
-
Fendalton
26
7
14
-
Ilam
-
-
-
-
Table C6.4 - Changes in ground elevation inferred from LiDAR survey
Suburb
Change in ground elevation from July 2003 to September 2011
(positive values are uplift, negative values are subsidence)
Bishopdale
Typically -400mm to -150mm (Average -250mm)
Bryndwr
Typically -350mm to -150mm (Average -250mm)
Burnside
Typically -250mm to +0mm (Average -150mm)
Fendalton
Typically -400mm to -100mm (Average -250mm)
Ilam
Typically -100mm to +50mm (Average +0mm)
ENVIRONMENTAL AND ENGINEERING CONSULTANTS
80
EARTHQUAKE COMMISSION: Canterbury Earthquakes 2010 and 2011 - Land report as at 29 February 2012
Factsheet 6 - Ilam to Bishopdale
Bishopdale, Bryndwr, Burnside, Fendalton and Ilam
Unmapped, no observations (uncoloured)
No lateral spreading but large quantities of ejected material
No observed ground cracking or ejected liquefied material
Moderate to major lateral spreading; ejected material often observed
Suburb
Observations
Minor ground cracking but no observed ejected liquefied material
Severe lateral spreading; ejected material often observed
No lateral spreading but minor to moderate quantities of ejected material
Territorial Authority suburb boundary
Bishopdale
Bryndwr
Minor to moderate liquefaction in several areas, causing sand ejection and settlement.
HIG
PLA
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PR
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GLA
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WROXTON TERRACE
FENDA
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TUI STREET
Fendalton
A
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AV
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GA
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GLA
WAIWETU
ST
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TUDOR AVENUE
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JEFF
AD
RO
NS
A
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TR
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D
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AV
EN
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AD
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NU
VE
AA
BR
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UN
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SOLWAY AV
ENUE
HS
D
CR
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AY
LW
GA
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EN
AV
OA
IS R
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WIL
FRID
STR
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AD
D
ROA
REG
GAR
AVENUE
M
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LEES ROAD
RO
ILAM
AD
ROAD
WADELEY
AV
EN
U
IG
BL
OA
E
NR
NU
WA
VE
RO
AA
ST
PH
AL
T
REE
T ST
EVAT
ST
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NDW
BRY
AD
Ilam
AN
D
O
IR
AD
ET
RE
ST
AO
NG
RA
CO
LW
YN
AD
O
IR
UE
EN
AV
E
VU
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LL
EN
BE
AV
IR
A
BL
ST
RE
ET
RD
Bryndwr
ST
RE
ET
AD
E RO
CLYD
RO
WAIMAIRI
STREET
STREET
LONGMUIR
HOUNSLOW
DOVEDALE
RY
EL
AO
NG
RA
MA
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D
RD
RO
AD
AD
FO
AT
W
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DR
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IV
FO
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ST
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RO
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NU
PA
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RO
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TH
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W
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W
AV
L
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ST
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CO
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BO
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WA
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RO
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I
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SID
WAY
AM
BR
EN
TP
MO
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AR
LC
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TRE
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SA
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RO
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Papanui
LA
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HO
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AN
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RO
TR
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Linwood, North Linwood, Opawa, Phillipstown, St Martins, Waltham & Woolston
ENUE
AL AV
KEND
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S
NO
RT
H
AV
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N
AN
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SA
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AV
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Northcote
PADDINGTON STR
EET
ST
RE
ET
LA
CE
RT
H
EA
ST
L IN
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ROAD
TUCKERS ROAD
NORTHCOTE ROAD
HIG
BA
IN T
ON
HS
TR
EE
T
CAVENDISH ROAD
HS
TE
DR
OA
D
DR
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RO
AD
HS
TE
D
AIN
T
EW
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Casebrook
ES
VEITCH
Bishopdale
RA
LE
IG
Burnside
Applicability - This report was prepared and/or compiled for the Earthquake Commission (EQC) to communicate information
that may be relevant to residential land claims under the Earthquake Commission Act 1993. The report was not intended for
any other purpose and may not be relied upon for any other purpose. EQC and its engineers, Tonkin & Taylor, have no liability
to any user of any map(s) and data in this report or for the consequences of any other person relying on them in any way. This
information is not intended to form a complete technical report on land changes in all or any part of Canterbury.
AD
COTSW
OLD A
VENUE
RE
ES
TR
GA
EE
RD
T
IN
ER
OL
SR
DW
OA
OO
D
DS
TR
EE
T
AD
RO
TO
N
CR
OF
ST
RE
ET
RD
ISL
ABROS PLACE
Most of this suburb was not mapped at a property-by-property level, however street-level mapping
and air photo analysis found no surface evidence of liquefaction or related land effects across the rest
of the suburb.
For further area-wide geotechnical information, refer to the technical data reports
on the EQC website, at http://canterbury.eqc.govt.nz/news/reports
BR
EE
NS
RO
AD
SKYE
DA
Minor to moderate liquefaction in several small localised areas, causing sand ejection and settlement.
Localised moderate lateral spreading on a small number of properties beside Waimairi Stream.
LE
O
Ilam
ST
RE
ET
For the remainder of the suburb, no surface evidence of liquefaction or related land effects was observed.
GL
AS
NE
VIN
NS
R
WA
TS
O
Moderate to major lateral spreading towards streams and watercourses in many areas, but generally
localised to the immediately adjacent properties.
RIV
E
Extensive areas of minor to moderate liquefaction (severe liquefaction on a small number of properties),
causing sand ejection and settlement.
AD
RO
TR
AF
FO
Fendalton
D RO
BE
CM
EA
DD
Most of this suburb was not mapped at a property-by-property level, however street-level mapping and
air photo analysis found no surface evidence of liquefaction or related land effects.
IVE
Burnside
HARE
WOO
LE DR
For the remainder of the suburb, no surface evidence of liquefaction or related land effects was observed.
SA
WY
ER
SA
RM
S
WOO
LDRID
GE R
OAD
In the surrounding areas, settlement and minor ground cracking observed without any obvious surface
evidence of liquefaction, likely due to minor liquefaction occurring at depth below the surface but not
being ejected.
OA
D
Table C6.5 - Liquefaction and lateral spread observations
Figure C6.1 - Overview of liquefaction and lateral spreading observations, aggregated from mapping undertaken following
the earthquakes of 4 September 2010 and 22 February 2011. ENVIRONMENTAL AND ENGINEERING CONSULTANTS