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Design of soakaways (formerly HA 118/06). Version 1.1.0

DMRB: Drainage CD 530

Design of soakaways (formerly HA 118/06). Version 1.1.0

Document Status



Civil & Structural Supplement


DMRB: Drainage


Provides guidance for designing soakaways to be incorporated into runoff systems for treatment and storage before discharging to ground. Includes descriptions of different soakaway types, requirements, design, storage, spillage and pollution control, construction and maintenance.


Drainage. Design. Supersedes CD 530 Revision 1. Drainage. Design. Design of soakaways (formerly HA 118/06) (HE, 2020). Design manual for roads and bridges (DMRB). Version 0 dated Dec 2019 - replaces HA 118/06. Version 1 dated Mar 2020 - updates references. Version 1.1.0 dated November 2021 - changes made to core document.


Publisher History

National Highways is a government company, with responsibility for operating, maintaining and improving motorways and major A roads in England. It works with the Department for Transport and was previously known as Highways England and Highways Agency.



NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.

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