Rock Protection

River and Canal Work

Rock Protection for River and Canal frontages

Practically all local river and canal banks have been given additional stability protection by the placement of rockwork in front of damaged or new revetments. The size of the stone required for protection of this bank rockwork is highly variable, and depends on many different factors.

The basic principal is inherently simple. The greater the hydraulic forces to which the armour is exposed, then the larger must be the pieces of rock. But hydraulic forces vary wildly. The most common agencies that can damage estuarine channel rock facings are wind waves, boat wakes, strong eddies and scour erosion through the rockwork, loss of background support and extreme local water velocities during floods and these also vary dramatically in different parts and places of the waterways system.
Ref: When Retaining Walls come Tumbling Down P.316

Further Reading:

When Retaining Walls Come Tumbling Down

When Retaining Walls Come Tumbling Down 
Author: Alan Davis

Before

After

Bank erosion

Loss of property from bank erosion was a concern in relation to landscape project. Rocks were used to stabilize bank, all works were done by barge.

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Profile loss

Loss of existing rock profile was of concern and a safety issue for this project. New rocks were placed with a long term profile in mind. All works done by barge.

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Before

After

Before

After

Sand loss

Loss of sand behind revetment wall caused pathway that was foundation support to retaining wall showing signs of failure. Before commencement of remedial works, stabilization of revetment wall was required (rock protection).

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Protection

Shows rock protection.

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Before

After

Rock Protection

Major collapse of revetment wall undermining retaining wall after heavy rains can be challenging.

After shows completed works including rock protection to prevent future failure.  All works Engineered Certified.

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River bank erosion

River bank erosion from floods and boat wakes. This project was causing major loss of property. A re-establishment of bank and rock profile to suit the purpose, all works completed by barge.

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Before

After

Rock profile

Rock profile to stop further movement of wall.

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Barge access

Rocks being placed by barge and excavator.

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Major project

Rock protection at a major resort.

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Rock profile

Completed rock profile.

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