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
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 Floods
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.
Gabions Ready for 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
Purpose built lifting cradle
This allows gabions to be pre filled and lowered into place for immediate protection
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.
Strongest wire mesh
In locations where high flood water velocities are expected, carrying woody debris and gravels in suspension, the stronger 4.5mm or 5.2mm welded gabions are the preferred choice, to resist damage to the gabion structures during floods.
Rock grading
The rock grading for erosion control gabions must be between 70mm to 200mm sizing. Non durable fine material is not acceptable
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