DAM/General/TBT-DAM-002

Flood Defence Construction Safety

Dams, Reservoirs & Flood Defence › General › Flood Defence Construction Safety

Presenter		Project
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Flood defence construction involves building walls, embankments, barriers, and gates to protect communities from river and coastal flooding.
Working near water is the primary hazard — rivers, estuaries, and coastal locations present drowning risk throughout the project.
Flood defences are often constructed alongside live watercourses that can rise rapidly during rainfall events.
Temporary cofferdams and diversion channels are used to keep water away from the construction area during building.
Cofferdam failure or overtopping during a flood event can inundate the work area with minimal warning.
Heavy earthworks involving embankment construction require compaction control and slope stability monitoring throughout.
Sheet piling for flood walls involves vibration, noise, and heavy plant working near the water's edge.
Concrete flood wall construction combines formwork, reinforcement, and pour operations in a waterside environment.
Environmental protection of the watercourse from silt, concrete, and fuel spills is strictly enforced by the Environment Agency.
Flood defence sites are often in residential areas, requiring community liaison, noise control, and public safety measures.

Rapid water rise	Rivers and coastal water levels can rise faster than predicted — flood warning systems and evacuation plans are essential.
Cofferdam failure	A cofferdam breach fills the work area with water, trapping workers — regular inspection and emergency procedures save lives.
Environmental sensitivity	Flood defence work takes place in and beside watercourses — pollution incidents carry unlimited fines and criminal prosecution.

Don't

Monitor river and tide levels continuously and know the flood warning triggers.
Inspect cofferdams and diversion works daily and after every rainfall event.
Wear personal flotation devices when working within two metres of the watercourse.
Ensure rescue equipment is available at all waterside work locations.
Plan evacuation routes from the work area in case of rapid water level rise.
Follow compaction specifications for embankment construction to ensure stability.
Control silt, concrete washout, and fuel runoff to prevent watercourse pollution.
Use noise and vibration controls when piling near residential properties.
Communicate with the community about noisy or disruptive phases of work.
Brief all workers on flood warning signals and the evacuation procedure daily.

DON'T ignore rising water levels — follow the flood warning and evacuation triggers.
DON'T skip cofferdam inspections — a breach floods the work area with minimal warning.
DON'T work near the watercourse without wearing a personal flotation device.
DON'T start waterside work without rescue equipment in place and accessible.
DON'T remain in the work area when flood warnings indicate imminent risk.
DON'T accept embankment fill without compaction test results confirming the specification.
DON'T allow any pollutant to enter the watercourse — the penalties are severe.
DON'T pile near homes without vibration monitoring and community notification in place.
DON'T ignore community complaints — address them promptly and record the response.
DON'T work on flood defences without understanding the daily flood risk and escape routes.

See also: Dam and Reservoir Safety Awareness | Working Over Water

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