Construction of the scheme
- Upgrading of the existing track from the
road end to the west branch of the Matiri river.
- Construction of a ford across the west branch
of the Matiri river.
- Upgrading of existing track from the west
branch to the power house.
- Construction of a new track from the power
house site to the lake outlet.
- Installation of the penstock either beneath
the track or above ground on bearers alongside the track.
Above ground installation of the penstock will be predominantly
within the forest.
- Temporary lowering of lake Matiri and construction
of concrete outlet weir structures. A temporary coffer dam
will be used to aid construction of the main and largest
weir containing the penstock, spillway and fish pass structures.
Concrete for the two smaller weirs will be delivered by
helicopter to minimise site damage.
- Installation of a small control hut at the
Installation of the 1.6M diameter penstock.
- Construction of power house and tailrace.
- Construction of new transmission line from
the end of the existing Network Tasman line to the power
It is estimated that construction of the scheme
will span 12 months. An excavator will be used for the majority
of the earthworks and concrete will be produced at a temporary
batching plant established on New Zealand Energy land and
delivered to the required location by truck or helicopter.
Humus and duff material will be stockpiled
during initial vegetation clearance and replaced on exposed
areas of soil such as cut batters in order to ensure rapid
reinstatement of native plant cover.