Solutions Toolbox

If you would like to discuss your particular project, please call 0800 36 3333, or +64 (0) 7 312 4647 if outside of New Zealand.

Click this link for a great understanding of what fish require for upstream migrations and remediation tools to achieve this. 

 

Below is a table to help find solutions based on structure type. To use, find the best description of the structure concerned in the left-hand column, then scroll across to the corresponding challenge. Depending on the type of fish that are in your waterway, you can select the appropriate tools using the key below (eg. s = all swimmers, j = jumpers, and c = climbing species.)

Challenge
Structure Type Tidal Flushing to be improved Culvert Perched more than 300mm Culvert Perched less than 300mm High velocity Low flow
Tide gate with headwall Remove flap
$s j cFit FFG
$ $

s j c

 n/a n/a n/a n/a
Tide gate
without headwall		 Remove flap
$s j cFit FFG
$ $

s j c

 n/a n/a n/a n/a
Culvert
less than 1200mm* diameter		 n/a Rubber-ramp
$s j cRope
$

j c

Landscaping
$ $

s j c

 Supported

Rubber-ramp
$

s j c

Fibre-glass ladder
$ $

s j c

New Rope
$

j c

Used Rope
$

c

 Rubber-combo
$s j cNew Rope
$

s j c

Used Rope
$

j c

 Rubber-combo
$s j cNew Rope
$

j c

Used Rope
$

j c
Culvert more than 1200mm* diameter n/a Rubber-ramp
$s j cFibre-glass ramp
$ $

s j c

Landscaping
$ $

s j c

 Supported

Rubber-ramp
$

s j c

Fibre-glass ramp
$ $

s j c

Landscaping
$ $

$ s j c

 Baffles
$ $s j cRubber-combo
$

s j c

New Rope
$

s j c

Used Rope
$

j c

 Baffles
$ $s j cRubber-combo
$ $

s j c

New Rope
$

j c

Used Rope
$

j c
Box Culverts & Aprons n/a Rubber-ramp
$s j cFibre-glass ramp
$ $

s j c

Landscaping
$ $ $

s j c

New Rope
$

j c

Used Rope
$

j c

 Supported

Rubber-ramp
$

s j c

Fibre-glass ladder
$ $

s j c

New Rope
$

w c

Used Rope
$

c

 Angle-iron
$s j c		 Angle-iron
$s j c
Weir less than 4m n/a Rubber-ramp
$s j cNew Rope
$

j c

Used Rope
$

j c

 Rubber-combo
$s j cNew Rope
$

j c

Used Rope
$

j c

 Rubber-combo
$s j cNew Rope
$

s j c

Used Rope
$

j c

Angle-iron
$

j c

 Angle-iron
$j c

* There is a variation in recommended products based on culvert size, as culverts smaller than 1200mm in diameter can be difficult for workers to access.