Challenge

Understanding the impact of planning and road run-off on water systems

Posted by
 
Clean Water South
on 12th March 2026
Interests
  • Sustainable development
  • Smart mobility
  • Nature and biodiversity
Communities
  • Clean Water South
  • Nature & Biodiversity Community Hub
  • Future Cities Community Hub

The Challenge 

Planning and road‑runoff pressures contribute significantly to pollution, increased sediment loads, habitat fragmentation, and altered water flows. However, evidence is often fragmented across multiple authorities, datasets and frameworks, making it difficult to understand where impacts originate and how to intervene effectively. 

This challenge aims to: 

  • Improve quality assessment for planning and decision‑making 
  • Provide open access and benchmarking of relevant datasets 
  • Create a shared framework for understanding how planning decisions influence water systems 
  • Identify where road run‑off issues occur and why 
  • Map the links between planning decisions, run‑off, pollution, and habitat fragmentation 
  • Use modelling tools to connect planning choices with water‑quality outcomes 
  • Provide robust evidence for planning authorities  

Potential Impact 

  • Better planning decisions that reduce pollution risk 
  • Improved management of urban run‑off 
  • Greater collaboration between planning authorities, EA and water companies 
  • Ability to identify highest‑impact interventions 
  • Long‑term reduction of contaminants entering rivers and groundwater 
  • More coherent and evidence‑backed infrastructure planning 

Barriers to Progress 

  • High complexity due to multiple authorities and stakeholders 
  • Challenges obtaining consistent planning data 
  • Evidence gaps, requiring more targeted research 
  • Coordination needed between rivers groups, councils, highways teams and EA 
  • Multiple different frameworks, difficult to align 
  • Lack of funding and long‑term commitment 
  • Insufficient capacity or trained staff for new monitoring work  

Timeframe 

Long term (18+ months)  

Call to Action 

Members are encouraged to: 

  • Submit ideas on frameworks, tools, or mapping approaches that link planning decisions to water outcomes 
  • Endorse promising ideas from other members
  • Comment with insights from planning practice, run‑off modelling or catchment monitoring 
  • Join a project team in the next stage to build a shared, multisector approach to planning and road‑runoff management 


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