Gabion-erosion-control | gabion1.co.nz

Gabion Erosion Control

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HOW TO CONTROL RIVER EROSION

Gabion river and stream erosion benfits are…

Rapid construction and immediate use

Dissipate flowing water energy

Semi flexible building blocks for channel stabilisation.

Have an irregular surface to diffuse and reduce river bank scouring

Much cheaper, more flexible and greener than concrete

Gabion foundation

Gabion baskets placed placed on top of a gabion foundation basket, this details results in a foundation that is better able to resist scour and undermining of the gabion wall.

How gabion erosion cages work

Gabion baskets placed on the outside of the river bend to prevent river bank erosion during floods. Geotech filter fabric is placed behind and underneath the gabion baskets to prevent the movement of soil material through the gabions.

Design for peak flood events

Gabion flood projection must be designed to cope with peak river flows often referred to to as 1 in 50yr, or 1 in 100yr floods. This often requires larger gabion walls and foundations, than envisaged. An engineer is able to examine historical weather data, and design for the expected flood events over the life time of the wall.

Gabions are ready for immediate use

Machine and hand filling gabions, is often possible without having to divert the river with a bund

Temporary bund

Building a temporary bund, to often done, to speed up construction

Scour Protection

Placing large rocks, at the base of the gabion, provides added erosion protection. These rocks may need to be inspected and replaced after flood events

Lifting cradle design

This allows cradles to be prefilled and then lowered into place for immediate protection.

Flexibility to movement

Gabions can flex to ground movement, dissipate energy from flowing water, and drain freely.

Strongest wire mesh

In areas prone to high flood water speeds that carry woody debris, use 4.5 or 5.2mm welded gabions to withstand damage during floods.

Rock Grading

The rock grading for gabions must be between 70mm to 200mm. Non durable fine material is not allowed

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