Solutions Toolbox

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.)

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.

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 c

Fit FFG
$ $

s j c

n/a n/a n/a n/a
Tide gate
without headwall
Remove flap
$

s j c

Fit FFG
$ $

s j c

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

s j c

Rope
$

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 c

New Rope
$

s j c

Used Rope
$

j c

Rubber-combo
$

s j c

New Rope
$

j c

Used Rope
$

j c

Culvert more than 1200mm* diameter n/a Rubber-ramp
$

s j c

Fibre-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 c

Rubber-combo
$

s j c

New Rope
$

s j c

Used Rope
$

j c

Baffles
$ $

s j c

Rubber-combo
$ $

s j c

New Rope
$

j c

Used Rope
$

j c

Box Culverts & Aprons n/a Rubber-ramp
$

s j c

Fibre-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 c

New Rope
$

j c

Used Rope
$

j c

Rubber-combo
$

s j c

New Rope
$

j c

Used Rope
$

j c

Rubber-combo
$

s j c

New 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.