Aviation·Heathrow Airport Balancing Ponds·—·Heathrow Airport Balancing Ponds

Heathrow Airport Balancing Ponds

Year-round flow control · £2.1m bundled into wider programme

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Key insight

Integrating climate adaptation into planned development activities kept costs minimal — bundled with a wider infrastructure programme rather than treated as standalone.

Transferability to UK: HighTilting weir systems and Nature-based Solutions directly applicable to other airports, ports, and urban transport infrastructure facing surface water flooding.

Constructed balancing ponds to manage both drought and heavy rainfall events, controlling water volume entering drainage systems and reducing flood risk to airport access routes.

Climate drivers

Heavy rainfallDrought

Impacts

→Flooding – fluvial→Flooding – surface water

Adaptation measures

  • Balancing ponds
  • Tilting weirs
  • Nature-based solution
  • MBBR wastewater treatment

Assets affected

Access routesAirport services

Investment

£2.1m (sheet piling component)

Band: £1m–£10m

Delivery period

—

  • The River Crane flows from north to south to the east of Heathrow Airport. The river system is very prone to flash flooding during heavy rainfall events . The majority of Heathrow Airport lies within the River Crane catchment.
  • The floodplain of the river contains a staff car park, customer park and ride, as well as a dual carriageway and causeway that serve as access routes to the airport. The airport terminals and runways are outside of the floodplain.
  • Surface water runs off the nearby, upstream dual carriageway during heavy rainfall, increasing the flooding downstream .
  • Hardstanding areas and artificial drainage systems along the river result in rainfall reaching the channels very quickly, increasing the risk of flooding after heavy rainfall but also drought vulnerability during summer periods of reduced rainfall .
  • Drought events result in a lack of water for fire-fighting and other essential airport services .

Ref: ID_32 · Heathrow Airport Balancing Ponds · Curated & verified by HIVE

Transferability to UK: High

Tilting weir systems and Nature-based Solutions directly applicable to other airports, ports, and urban transport infrastructure facing surface water flooding.

UK contexts

Other UK airportsUrban transport hubsCoastal infrastructure

London & South East

Transfer to other sectors (AI)