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Concrete Drop Structure

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Description

These structures are similar in design to gully head structures. Usually built as a free standing wall. Drop usually limited to 3 metres. Cost $20,000 plus.

Application

Used to control active bed erosion. Often installed to protect an upstream asset such as a bridge or culvert.

Limitations

Drop height is usually limited by channel capacity.

Requires rock bar or stable channel downstream to prevent undermining.

Forms a barrier to fish and other aquatic fauna.

Comments

Expensive to build because of difficult site conditions. Requires deep foundations into floor and banks to prevent failure.