DAM/Specific/TBT-DAM-013

Pumping Station Construction (Flood)

Dams, Reservoirs & Flood Defence › Specific › Pumping Station Construction (Flood)

Presenter		Project
Location		Date

Flood pumping stations are constructed in low-lying areas to pump excess water into rivers or drainage channels.
Construction involves deep excavations, piling, and concrete work in areas with high groundwater levels.
The site is inherently flood-prone — working in the location the pumping station is designed to protect.
Dewatering systems must run continuously throughout construction to keep the excavation workable.
Confined space hazards arise during construction of wet wells, sumps, and below-ground chambers.
Mechanical and electrical installation includes large pumps, switchgear, and control systems.
Environmental permits are required for temporary discharge of pumped water during construction.
Flood warning procedures must be in place with trigger levels for evacuating the site.
Access roads to flood pumping stations are often on flood plains with soft ground conditions.
Commissioning involves testing pumps with large volumes of water under operational flood conditions.

Flood risk	The construction site is in a flood-prone location — the risk of sudden inundation is real and must be actively managed.
Deep excavations	High groundwater and soft ground make deep excavations for wet wells particularly hazardous.
Confined spaces	Below-ground chambers and wet wells created during construction become confined spaces requiring formal controls.

Don't

Monitor flood warnings and river levels continuously throughout the construction period
Maintain dewatering systems with standby pump capacity at all times
Establish flood evacuation trigger levels and brief all workers on the escape plan
Treat all below-ground chambers and wet wells as confined spaces during construction
Obtain environmental permits for temporary discharge of pumped groundwater
Assess ground conditions for plant stability before positioning heavy equipment
Install edge protection around deep excavations and wet well openings
Coordinate MEICA installation with civil works to avoid trade clashes below ground
Maintain site access roads so emergency evacuation vehicles can exit at all times
Test commissioning procedures under controlled conditions with full rescue standby

DON'T work on the site during active flood warnings without specific authorisation
DON'T allow dewatering pumps to stop without backup — the excavation will flood rapidly
DON'T enter wet wells or sumps without confined space permits and rescue plans
DON'T ignore rising groundwater levels — increase dewatering capacity and reassess
DON'T discharge pumped water without the required environmental permit
DON'T position heavy plant on waterlogged ground without ground assessment
DON'T block the site access road with materials — emergency exit must always be clear
DON'T start commissioning with water without briefing the team on drowning risks
DON'T leave excavation edges unprotected near wet well openings
DON'T assume dry weather means no flood risk — upstream events travel downstream

See also: Flood Defence Construction Safety | Dewatering (Wellpoints and Sumps)

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