2:00pm - 5:00pm




Free to attend

Hosted by CIRIA in association with CIWEM and CaBA

Join this webinar to discover what nutrient neutrality is, what it means in practice, and how it can be achieved.

A susdrain event in association with:


Many lakes, rivers, estuaries, wetlands and other sites dependent on water are important and protected habitats. Nutrients, such as nitrates and phosphates, support excess growth of algae and vegetation which are damaging to the natural water environment because they out-compete the natural vegetation and reduce oxygen supply to the water. It is crucial that these habitats are not destroyed or adversely impacted by new development, which brings with it potential sources of nutrient input.

Water companies are required under the Environment Act to assess the environmental impacts of the sewerage system including the impacts of nutrient loads from wastewater treatment works on protected sites.

Natural England states that ‘Development plans can be considered ‘nutrient neutral’ where they can demonstrate that they will cause no overall increase in nutrient pollution affecting specified Habitats Sites’.

This webinar will set the scene and examine the issues from the point of view of:

  • National regulators (eg Natural England) who are concerned about the impact of nutrients on water quality and habitats, and are developing resources to support those involved in the planning and development process.
  • Local planning authorities who decide planning permission for development.
  • Water and sewerage companies who need to plan for the management of nutrients at designated sites.

The webinar will feature practical approaches to manage nutrients using wetlands and Sustainable Drainage Systems (SuDS) as well as guidance from The Rivers Trust and CIRIA.

Register for 28 November 2022


Free to attend for:

  • susdrain partners and supporters
  • CIRIA Biodiversity Community of Practice members
  • CIRIA, CaBA and CIWEM members
  • Non-members

Why attend

  • Understand the issues surrounding nutrient neutrality
  • Hear how nutrient neutrality impacts the process of new development
  • Learn about practical approaches to nutrient management using wetlands and Sustainable Drainage Systems (SuDS)
  • Earn valuable CPD.

Who should attend

  • susdrain, CaBA CIWEM members
  • Local authority planners
  • Private sector planners
  • Developers and development consultants
  • Land agents
  • Environmental consultants
  • Sewerage undertakers
  • Tier 1 engineering consultants
  • SuDS designers
  • Landscape architects


14:00 Welcome and introduction

Peter Bide | Urban Working Group Chair | CaBA

14:20 Nutrient neutrality: the issues

Simon Thompson | Principal Advisor: Strategic Solutions | Natural England

14:40 Nutrient neutrality: the impacts on planning

Rachel Jones | Ecology Manager (Interim) | Wiltshire Council

15:00 Nutrient neutrality: the impacts on water and sewage companies

Speakers to be announced | Northumbrian Water

Speakers to be announced | United Utilities

15:20 BREAK

15:30 Nutrient neutrality: solutions – wetlands

David Johnson | Technical Director | The Rivers Trust

15:50 Nutrient neutrality: solutions - Sustainable Drainage Systems (SuDS)

Dr Louise Walker | Senior Research Manager | CIRIA

Jo Bradlley | UK Director of Operations | Storm Shepherds

Phil Williams | Technical Director | The Environmental Protection Group

16:10 Nutrient neutrality: solutions – case study

Dr Martina Girvan and Renuka Gunasekara | Technical Directors | Arcadis

16:30 Interactive discussion and Q&A

16:55 Closing remark

Booking and joining information

Please sign in or create an account to register online for this event.

If you are experiencing issues registering online, please complete and return the booking form to Susan Richards.

Alternatively please contact us on 07933 181 765 or email our Customer Services team.

Joining instructions will be sent 10 days before the event. The link to attend the webinar is strictly personal and should not be shared.

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