FOI request detail

Request for flood prevention measures in London Subway

Request ID: FOI-1987-2021
Date published: 26 January 2021

You asked

I would like to know the flood prevention measures in place for the London Subway, below I have listed some excepts from the Code Of Practice for flood prevention in Singapore. - all ingress and egresses to the Underground Rapid Transit System (including pedestrian/traffic linkages and ventilation/services openings) are to be built with a segregation threshold of at least 1metre above flood and ground levels. - install an active pumping capacity equivalent to the 100-year return storm intensity corresponding to the time of concentration of the storm catchment (excluding the internal infiltration route of the tunnel surface) as determined from the Code of Practice on Surface Water Drainage, capped at 280mm/hour for a typical 10-minute concentration duration. I would like to obtain a Code of Practice for flood prevention in London. If not possible, data similar to the examples above: - segregation threshold for entrances and exits - drainage capacity in the subway - emergency plans in case of actual flooding

We answered

TfL Ref: 1987-2021

Thank you for your request received by us on 6 January 2021 asking for information about flood prevention measures for the London Underground.

Your request has been considered in accordance with the requirements of the Freedom of Information Act and our information access policy.  I can confirm that we hold some of the information you require.

We do not have one singular document that covers your request, nor do we have a ‘Code of Practice’ for flood prevention for our London Underground network. Each of the 270 stations on our network has a different layout and therefore different risk from flooding primarily due to factors such as location of water mains and sewers, and proximity to the Thames tidal or other river floodplains.

However you may be interested in looking at the links contained in a previously published response on the risk of flooding on the London Underground from sea level rises which can be accessed via the following link:

You may also be interested in looking at the flood risk assessment and standards information contained in a published report available on our website relating to the Bank Station Capacity Upgrade from September 2014:

If you are considering submitting a further FOI request please think carefully about whether the request is essential at this current time, as answering FOI requests will require the use of limited resources and the attention of staff who could be supporting other essential activity. Where requests are made, please note that our response time may be impacted by the current situation.

If this is not the information you are looking for, or if you are unable to access it for any reason, please do not hesitate to contact me.

Please see the attached information sheet for details of your right to appeal as well as information on copyright and what to do if you would like to re-use any of the information we have disclosed.

Yours sincerely

Sara Thomas

FOI Case Management Team

General Counsel

Transport for London

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