Construction work on dams and reservoirs involves working near or within large bodies of stored water. The consequences of a dam failure during construction are catastrophic, with the potential for loss of life downstream. Workers face drowning risks, unstable ground conditions, and the challenge of working in remote locations with limited emergency access. The Reservoirs Act places specific legal duties on reservoir construction and any work must be supervised by a qualified civil engineer.
Key Hazards
Drowning from falling into reservoir water or flooded construction areas
Dam or embankment failure during construction causing catastrophic flooding downstream
Unstable ground conditions on embankments, spillways, and reservoir margins
Remote site location delaying emergency response and medical assistance
Control Measures
Wear personal flotation devices at all times when working within two metres of reservoir water.
Ensure a qualified civil engineer supervises all work affecting the structural integrity of the dam.
Install edge protection and barriers around all open water within the construction area.
Provide rescue equipment including throw lines and lifebuoys at accessible points around the reservoir.
Monitor water levels, rainfall, and inflow conditions continuously throughout the construction period.
Establish emergency procedures covering dam breach, flooding, and site evacuation scenarios.
Maintain safe access routes that allow emergency vehicles to reach the site at all times.
Brief all workers on the specific hazards of the reservoir environment during site induction.
Ensure communication systems are reliable in the remote location including mobile phone coverage or radios.
Emergency / Rescue
If water levels rise unexpectedly or dam movement is detected, evacuate the site immediately via the designated escape routes. Sound the downstream warning system if installed. Call 999 and the reservoir panel engineer.
Remember
Dam construction failures can cause catastrophic flooding with the potential for mass casualties.
A qualified civil engineer must supervise all work affecting the structural integrity of the dam.
Personal flotation devices are mandatory for everyone working near reservoir water.
Remote locations mean longer emergency response times, making on-site preparedness essential.
Monitor water levels and weather continuously because conditions can change rapidly.
The Reservoirs Act imposes strict legal duties on anyone carrying out work on large raised reservoirs.
Applicable Legislation: Reservoirs Act 1975 · CDM Regulations 2015 · Health and Safety at Work etc. Act 1974 · Flood and Water Management Act 2010