DAM/Specific/TBT-DAM-008

Sheet Pile Flood Defence

Dams, Reservoirs & Flood Defence › Specific › Sheet Pile Flood Defence

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Sheet pile flood defences are interlocking steel sections driven into the ground to form permanent water barriers.
They are used along river banks, coastal frontages, and canal edges to prevent flood water overtopping.
Sheet piles are installed using vibratory hammers or impact hammers mounted on crawler cranes or piling rigs.
Each pile section weighs several hundred kilograms and requires crane handling with rated lifting accessories.
Noise and vibration from sheet piling can exceed exposure limits, requiring zones and monitoring.
Working near water during flood defence construction creates drowning risks requiring PFD use.
Ground conditions including boulders, rock, and buried obstructions can cause pile deviation or refusal.
Adjacent structures, services, and embankments may be affected by vibration during pile driving.
The interlocking clutch between piles must engage correctly to maintain the watertight seal of the wall.
PUWER 1998, LOLER 1998, and the Control of Vibration at Work Regulations 2005 apply to these works.

Prevent drowning	Flood defence work takes place directly beside rivers and coastal edges, creating immediate drowning risk if workers fall in.
Crush and strike risk	Heavy sheet piles handled by cranes can swing, drop, or trap workers, causing fatal crush injuries.
Vibration damage	Driving sheet piles near buildings, embankments, or services can cause structural cracking and service damage.
Legal compliance	PUWER, LOLER, noise and vibration regulations, and CDM 2015 all apply to sheet pile flood defence construction.

Don't

Wear a personal flotation device at all times when working near water.
Use a lift plan and rated accessories for handling every sheet pile section.
Establish exclusion zones around the piling rig and pile pitching area.
Monitor noise levels and enforce hearing protection zones during driving.
Survey adjacent structures before driving and monitor for vibration damage.
Check underground service locations before driving any pile position.
Inspect interlocking clutches as each pile is driven to confirm engagement.
Ensure rescue equipment including throw lines and lifebuoys are positioned nearby.
Brief all operatives on the emergency plan for man overboard incidents.
Plan pile delivery and storage to avoid loads near the water edge.

See also: Flood Defence Construction Safety | Sheet Piling Installation

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