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
  • Gabions are able to use smaller rock for river bank protection, when larger rip rap is unavailable
  • Much cheaper, more flexible and greener than concrete
  • Can be installed in wet or dry conditions
  • Free draining, with no hydrostatic pressure issues
river-bank-erosion

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.

gabions used for erosion control

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.

base later gabion erosion wall

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.

peak flood gabion control

Gabions are ready for immediate use

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

gabion-erosion-river bank protection

Temporary bund

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

gabion construction erosion wall detail

Purpose built lifting cradle

This allows gabions to be pre filled and lowered into place for immediate protection

gabion lifting cradle

Gabions can flex to ground movement

Gabions can flex to ground movement, dissipate energy from flowing water, and drain freely. Their strength and effectiveness may increase with time, as silt and vegetation fill the voids, and reinforce the structure.

river gabions erosion control

Use the strongest wire mesh

In locations where high flood water velocities are expected, carrying woody debris and gravels in suspension, the stronger 3/16th welded gabions are the preferred choice, to resist damage to the gabion structures during floods.

river in flood
poor gabion design
river undermones gabion
good gabion design

examples of erosion control projects