Urban Drainage Group

Our vision and aims

The CIWEM Urban Drainage Group (UDG) sustains the excellence of people professionally engaged in urban drainage management now and for future generations. It continues the work of WaPUG which was established in 1984.

The aims and objectives of the Urban Drainage Group are aligned with CIWEM’s Royal Charter. They are to:

  • Advance the science and practice of urban drainage management for the public benefit.
  • Promote education, training, study and research in urban drainage management and to publish the results of such research.
  • Establish and maintain appropriate standards of competence for urban drainage management Professionals.

Please contact us at udg@ciwem.org


Download UDG Aims and Objectives

The Urban Drainage Group and its predecessor WaPUG have a long history of providing guidance to assist the industry to follow best practice. Please find some publications below.


  • Code of Practice for the Hydraulic Modelling of Urban Drainage Systems: this best practice guide was updated in 2017 following significant upgrading with engagement with all UK water utility companies. It covers project definition; data collection; model development; verification; model confidence; application of model; documentation and model management.
  • UDG rainfall guide: published in 2015 this guide supplements the main modelling guide and provides background to various options for representing rainfall in modelling and provides guidance. This aspect of modelling is anticipated to change more frequently than other aspects due to improved climate change predictions; developments in telemetry and radar technology and improved technologies of handling and analysing large data sets. Therefore this guide is separate for the main guide to allow more frequent updates.
  • Event duration modelling good practice guide: this guide published in 2016 collates good practice on Combined Sewer Overflow (CSO) monitoring.
  • Guide to quality modelling of sewer systems: this guide published in 2006 provides guidance of the production of sewer quality modelling. It supplements the Code of Practice which addresses hydraulic modelling which is the basis of sewer quality models. The modelling of the impact on rivers can be found in the WAPUG River Modelling Guide. Guidance on how these models fit within the framework of Urban Pollution Management can be found in the Urban Pollution Management (UPM) Manual (FWR 1998).
  • Integrated urban drainage modelling guide: published in 2009 this guide outlines the different types of modelling approaches taken to model the urban drainage system and how it interacts with the wider water environment. It follows a similar layout to the Code of Practice covering Project planning; Data collection; Integrated Modelling Methods; Verification; Reporting. This report is currently under review for updating.
  • River data collection guide: published in 1998 this guide outlines the data collection requirements for a UPM study and supplements the River Modelling Guide.
  • River modelling guide: published in 1998 this guide provides guidance of river modelling for use in UPM studies. This report is currently under review for updating.
  • The design of CSO chambers to incorporate screens: latest publication in 2006 this guide sets out current best practice in the design of new CSO chambers to meet aesthetic regulatory requirements using screens. It is aimed primarily at design engineers but it should also prove valuable to environmental regulators, operations personnel, sewer network modellers and drainage area planners.


Here are useful summaries of comment details of how to approach modelling specific more complex elements. These were reviewed and rationalised in 2009. They are generated by the group community and further contributions are welcome, please get in touch with the committee if you wish to add any new ones.


You can access and download our past papers here

If you have any queries about our past papers, please email fiona.barbour@mottmac.com.

UDG community page

Get more involved with the Urban Drainage Group! For the latest announcements and discussions, please visit your UDG community page by logging into your account.

Log in here

UDG New Members Development community page

This is a page for all people working towards becoming a qualified member of CIWEM. We are hoping this would be an opportunity to have discussions on key topics; keep up to date with events and activities relevant to those in training; and ask questions of senior members of the UDG communities.

There is a recognition that many members in the UDG community have the same challenges in completing their competencies, and sharing examples of how these objectives are met can help overcome these hurdles. The value of this page will increase with use, so do contribute.

If you have suggestions on how to improve this page please contact James Hale james.hale@rpsgroup.com or Fiona Barbour fiona.barbour@mottmac.com.


Log in here

Our committee

CIWEM Urban Drainage Group Committee Election Notice

Nominations are sought to fill three positions on the CIWEM Urban Drainage Group Committee from 2020 for a minimum period of 3 years. Nominees for the committee would ideally have recent experience in supporting UDG activities and must be a Member of CIWEM (at any grade). Nominees should email the Honorary Secretary (ian.lang@atkinsglobal.com) before close of business on 30th August 2019 detailing: their experience and industry leadership skills; how they will contribute to delivering CIWEM UDG’s aims and objectives; and the names of two sponsoring CIWEM UDG members.

If more than three conforming nominations are received then a ballot of all members will be organised by the Honorary Secretary. The three candidates who receive the greatest number of votes shall be elected to fill the vacancies and the results announced at the next Annual General Meeting which will be held during the Autumn Conference on Tuesday 5th November at the Nottingham Belfry and on the UDG page of the CIWEM Website.

Typical commitments for a UDG Committee member include;

  • Maintain your CIWEM membership (any grade/level)
  • Attendance at 3 day-long committee meetings annually at venues throughout the UK
  • Attend at least 2 conference events (fee is waived)
  • Contribute ad hoc to running of UDG - through engagement in sub-group activities
  • Be an advocate for CIWEM and UDG in your company with your clients, collaborators and suppliers, and for the practice of Urban Drainage Management in your community and at work

If potential nominees would like further information about the role and the level of commitment required then please contact the Chairman (Elliot.Gill@stantec.com) or any committee member for further information.

Diary Dates 2019

Training Day

Tuesday 19 February 2019

IET Birmingham: Austin Court

Spring Conference

Wednesday 08 May 2019

IET Birmingham: Austin Court

Summer Conference

Thursday 27 June 2019

Double Tree by Hilton: Dunblane Hydro

Autumn Conference & Exhibition

Monday 04 – 06 November 2019

The Nottingham Belfry, Mellors Way, Nottingham

More Information

With thanks to our 2019 event sponsors

The Margetts Bursary in Urban Drainage Engineering 

The Margetts Bursary in Urban Drainage Engineering bursary is sponsored by CIWEM and RPS Environmental Management Ltd (RPS) to recognise the significant contributions made by Jamie Margetts in the field of urban drainage engineering, both in the UK and internationally.

Jamie was a technical director of RPS and chaired CIWEM’s Urban Drainage Group at the time of his death. As well as being part of the team that developed one of the UK’s most innovative Urban Drainage consultancies he made significant contributions to raising the technical capabilities of the UK Urban Drainage community. In particular, he always placed great emphasis on the education, mentoring and training of young urban drainage professionals.

This bursary has been set up to continue this work, by supporting young professionals (early career graduates, or final year undergraduates) to improve their capabilities in the field of urban drainage.

The bursary is of a value of £3,000, and will be awarded annually.

The purpose of the bursary is to:

  • To provide financial support for a young professional to obtain a postgraduate qualification which can support a career in the field of urban drainage.
  • To provide financial support to allow a young professional to carry out a period of research-based study that would significantly contribute to their career development in the field of urban drainage.

This bursary is now closed for 2019 applications. We will be contacting the winner in March/ April 2019.

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Since 1895, our members have been the leading practitioners in improving the quality and management of water and the environment. Learn more about our Trustee Board.

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