Design of combined surface and sub-surface drains and management of stone scatter (formerly HD 217/18). Revision 1

DMRB: Drainage CD 525 Revision 1

Highways England, 2020
Design of combined surface and sub-surface drains and management of stone scatter (formerly HD 217/18). Revision 1 Download document

Document Status

Current

Supplement

Civil & Structural Supplement

Series

DMRB: Drainage

Abstract

Details requirements and recommendations for the design of combined surface and sub-surface drains, also known as French Drains, used in road drainage systems. Covers the usage of topping materials as a safety feature, alternative filler materials and maintenance and rehabilitation of the drain.

History

Drainage. Design. Supersedes CD 525 Design of combined surface and sub‐surface drains and management of stone scatter (formerly HD 217/18) (HE, 2020) and HD 217/18 Geotechnics and drainage. Drainage. Alternative filter media and surface stabilisation techniques for combined surface and sub-surface drains (HE, 2018). Design manual for roads and bridges (DMRB). Revision 0 dated Feb 2020 - replaces HD 217/18. Revision 1 dated Mar 2020 - updates references.

Subjects

  • Civil engineering, infrastructure and public utilities
  • Transport facilities
  • Road surface water drainage
  • Roads

Publisher History

Highways England (formerly Highways Agency) was transformed into National Highways in 2021. It was responsible for the operation, maintenance and improvement of England's motorways and major A roads. It was an executive non-departmental public body, sponsored by the Department for Transport.

Information

NBS

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.

Accuris

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