Other tools NBS offers a range of tools for specification and collaboration National BIM Library The most trusted BIM Library in the UK, certified to the internationally-recognised NBS BIM Object Standard Uniclass 2015 A dynamic and unified classification system for the construction industry covering all sectors Construction Information Service (CIS) A comprehensive online collection of construction related standards, regulations, technical advice and articles Plug-ins NBS provides a range of tools to help connect your CAD model to your specification model
Platform Resources Support Events About TheNBS.com Manufacturers Uniclass 2015 Get in touch

Platform

NBS Chorus Features and pricing Book a demonstration Sign in to NBS Chorus Other tools National BIM Library Uniclass 2015 Construction Information Service (CIS) Plug-ins

Resources

Knowledge Sample Specification Case studies Authors

Support

Training Downloads and updates

About

About NBS Newsroom

Platform

NBS Chorus Features and pricing Book a demonstration Sign in to NBS Chorus Other tools National BIM Library Uniclass 2015 Construction Information Service (CIS) Plug-ins

Resources

Knowledge Sample Specification Case studies Authors

Support

Training Downloads and updates

About

About NBS Newsroom
Download from CIS *
* A valid subscription to The Construction Information Service is required to download this document.

Click here to find out how to access this document

DMRB: Drainage CD 525 Revision 1 Design of combined surface and sub-surface drains and management of stone scatter (formerly HD 217/18). Revision 1

Publication Year

2020

Document Status

Current

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.

Document 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

Publisher Information

Highways England

Highways England is now known as National Highways and 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 and was formerly known as Highways Agency.

National Traffic Operations Centre
3 Ridgeway
Quinton Business Park
Birmingham
HE
UK

Website: www.highways.gov.uk
Email: info@highwaysengland.co.uk
Tel: 0300 123 5000