Regional Land Elevation Maps - PCE · Helensville Kawau Parua Inlet Land Elevation < 50cm...
6
Regional Land Elevation Maps: Auckland Published in conjunction with the report Preparing New Zealand for rising seas: Certainty and Uncertainty November 2015 This document contains a number of maps showing areas in New Zealand that are low-lying and close to the coast, with a focus on urban areas. Land elevation in these maps has been measured using Light Detection and Ranging (LiDAR) technology, and is shown above mean high water springs (MHWS-10). Areas that are both low-lying and close to the coast are, in general, most vulnerable to sea level rise. This is certainly the case when it comes to coastal flooding and rising groundwater. Erosion is rather different – a shoreline need not be low-lying to be eroded. The elevation bands shown on the maps are not hazard zones and should not be interpreted as such. Such maps aid in identifying areas at risk as the sea rises. But local characteristics are also vitally important. For instance, a low-lying area close to the coast may be protected by a headland or a natural barrier such as a sand dune. And groundwater will only be a problem if it is connected to the sea. Detailed elevation surveys, using LiDAR technology, have not been carried out for the entire New Zealand coastline. As a result, maps for some urban areas are not available. For further information please see the full report and accompanying NIWA technical report at www.pce.parliament.nz
Transcript of Regional Land Elevation Maps - PCE · Helensville Kawau Parua Inlet Land Elevation < 50cm...
Regional Land Elevation Maps: Auckland
Published in conjunction with the report Preparing New Zealand for rising seas:
Certainty and Uncertainty
November 2015
This document contains a number of maps showing areas in New Zealand that are low-lying and close to the coast, with a focus on urban areas. Land elevation in these maps has been measured using Light Detection and Ranging (LiDAR) technology, and is shown above mean high water springs (MHWS-10).
Areas that are both low-lying and close to the coast are, in general, most vulnerable to sea level rise. This is certainly the case when it comes to coastal flooding and rising groundwater. Erosion is rather different – a shoreline need not be low-lying to be eroded.
The elevation bands shown on the maps are not hazard zones and should not be interpreted as such. Such maps aid in identifying areas at risk as the sea rises. But local characteristics are also vitally important. For instance, a low-lying area close to the coast may be protected by a headland or a natural barrier such as a sand dune. And groundwater will only be a problem if it is connected to the sea.
Detailed elevation surveys, using LiDAR technology, have not been carried out for the entire New Zealand coastline. As a result, maps for some urban areas are not available.
For further information please see the full report and accompanying NIWA technical report at www.pce.parliament.nz
0 2 41Kilometres
Land Elevation
< 50cm
50–100cm
100–150cm
Snells Beach
Omaha
Warkworth
¯
Low-lying coastal land in Omaha, Snells Beach, and Warkworth.
The elevation bands shown on this map are not hazard zones
Helensville
Kawau Parua Inlet
Land Elevation
< 50cm
50–100cm
100–150cm
0 2 41Kilometres
¯
Low-lying coastal land in Helensville.
The elevation bands shown on this map are not hazard zones
AucklandAirport
Māngere
MāngereBridge
Papatoetoe
Otahuhu
New Lynn
One Tree Hill
MountEden
Kingsland
Herne Bay
Parnell
BeachHaven Northcote
Takapuna
MountWellington
Remuera
Mission Bay
Devonport
AUCKLAND
Land Elevation
< 50cm
50–100cm
100–150cm
0 2 41Kilometres
¯
Low-lying coastal land in Auckland.
The elevation bands shown on this m
ap are not hazard zones
Land Elevation
< 50cm
50–100cm
100–150cm
Waiheke Island
0 2 41Kilometres
¯
Low-lying coastal land on Waiheke Island.
The elevation bands shown on this map are not hazard zones
Land Elevation
< 50cm
50–100cm
100–150cm
Waiuku
Manukau Harbour
0 2 41Kilometres
¯
Low-lying coastal land in Waiuku.
The
elev
atio
n ba
nds
show
n on
thi
s m
ap a
re n
ot h
azar
d zo
nes
