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MANAGEMENT PLAN
Utilities
Trelissick Park is strategically important with
regard to stormwater and sewer services in the northwestern suburbs.
The Kaiwharawhara and Korimako Streams are a major stormwater system
draining the valley from Karori and Northiand to the south , to Ngaio
and Khandailah to the north. Within the park there are also a number of
stormwater pipes, culverts and open streams which discharge stormwater
into the Kaiw harawhara and Korimako Streams. A stormwater tunnel under
the railway embankment takes the flow from the Kaiwharawhara Stream
from the Otari/Wilton area to the main stream which is a combination of
the Korimako and Kaiwharawhara Streams. A recently upgraded sewer pipe
is located within the tunnel.
Major sewer lines which convey sewage flow from
Wilton, Crofton Downs and parts of Khandailah and Karori to the main
sewer interceptor pass beneath the park. The 450 and 525mm diameter
pipelines were replaced in 1984. As a consequence of this work there
are some lengths of abandoned pipe lying within the park. There is also
a length of older sewer pipe of varying ages towards the eastern end of
the park. This pipe takes the flow from Wadestown. Upgrading works on
this pipelines are planned in the 1994/95 financial year. While most of
the sewer lines are underground there are locations throughout the park
where pipelines and manholes are quite visible. Two grill covered
tunnel portals can be seen from the main track when walking beside the
Kaiwharawhara Stream. Generally the sewer infrastructure within the
park while quite visible it is not generally obtrusive.
The 110kv Khandallah to Wilton transmission line
passes over the park. Pylons are located on the Northern Walkway spur
below Trelissick Crescent and on the area below Oban Street in Highland
Park.
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