scope:

This Standard applies to all FRM assets and SuDS owned by TfL and operated as permanently available infrastructure.

For the avoidance of doubt, this Standard applies to new and existing assets. It sets out the minimum requirements for flood protection to assets across all TfL modes. It is fully recognised that application of these flood protection requirements retrospectively to existing assets, could give rise to significant and unsustainable cost implications for the Business. This concern is dealt with via the fact that all such works are subject to tests of practicability, within which context, both practicality and cost are valid considerations that may lead to a relaxation of the Standard requirements.

This Standard defines the flooding-related design requirements for FRM and SuDS, and (additionally) the lifecycle responsibilities for SuDS assets.

The requirements of this Standard are broadly divided into two categories as follows:

a) TfL rail modes - including LU, London Overground (LO), Docklands Light Railway (DLR) and Trams (but not including where they interface directly with highways)

b) TfL non-rail modes - buses, roads, cycling, trams (where they interface directly with highways), etc.

FRM assets (e.g. floodgates) are typically civil engineering discipline assets, and life cycle responsibilities are typically defined within the relevant existing suite of TMS Standards (except for highways FRM assets). Where there is a conflict between the requirements of those existing standards and this Standard, direction shall be sought from the relevant technical authority for each TfL mode.

Note: This Standard should be read in conjunction with The Mayor of London's: The London Plan (TLP), London Environment Strategy (LES), Mayor's Transport Strategy (MTS) and the London Sustainable Drainage Action Plan (LSDAP); together with TfL's 'SuDS in London - a guide', TfL's Corporate Environment Plan (CEP), Climate Change Adaptation Plan (CCAP) and Streetscape Guidance (SG); and (for LU) TMS Guidance G1062 'Green Infrastructure Installation'.

Note: As of the date of issue of this Standard, TfL will shortly be issuing a 'Green Infrastructure and Biodiversity Plan'. This plan will include significant discussion of SuDS and should be referenced.

TfL also publish significant Green Infrastructure and climate change adaptation requirements and advice within the Safety, Health and Environment (SHE) Management System (accessed via Platform). Reference should be made to these.

Additionally, 'Pathway' is TfL's 'Delivery Methodology for Projects and Programmes', i.e. TfL's project management system. Various Pathway 'products' emphasize the importance of and reference FRM and SuDS, to ensure their consideration early in the lifecycle of a project. These products fall under both Civil Engineering and SHE (reference the SHE Environmental Evaluation (EE) product).

Purpose

The purpose of this Standard is to define the whole life cycle requirements for Transport for London (TfL) Flood Risk Management (FRM) and Sustainable Drainage Systems (SuDS) assets (as far as possible) in performance terms.

In defining requirements specifically applicable to TfL FRM and SuDS assets, this Standard complements The Management System (TMS) Standard S1050 'Civil Engineering - Common Requirements' where applicable, which defines mandatory requirements generally applicable to all London Underground (LU) civil engineering assets.