All forms of flooding and their impact on the natural and built environment are material planning considerations and flood risk can be an important issue for developers. JGP is able to guide developers through the planning process and can provide a Flood Risk Assessment (FRA) tailored to suit the location, scale and type of development. Liaising with the regulatory bodies enables us to ensure regulatory compliance and reach appropriate, cost effective and pragmatic solutions for our clients.


Flood Risk Assessments

A FRA is required to accompany a planning application where a development site is located within Environment Agency indicative Flood Zones 2 or 3; is larger than 1 hectare; is located within an Environment Agency-designated ‘Critical Drainage Area’; or is likely to affect a watercourse, such as the culverting of an open-channel.  New developments need to be safe to use over their intended lifetime and must not result in an increase in flood risk elsewhere. 

Depending on the proposed development and flooding scenario, our FRAs can range from simple factual statements to detailed flood modelling with hydraulic analysis and interpretation. Our Flood Risk Assessment services include:

  • Catchment hydrology and flood flow estimation using the Flood Estimation Handbook
  • Procurement of flood data from the Environment Agency
  • Hydraulic flood modelling (1-D and 2-D) to determine flood levels and extents
  • Extreme tidal flood and wave overtopping analysis
  • Consultation with Environment Agency and Local Authority Officers
  • Advice and design for flood risk mitigation measures to make development safe
  • Collation and assessment of the evidence required by the Local Authority for Sequential and Exception Tests
  • Code for Sustainable Homes (CfSH) Design Documentation for Flood Risk (SUR2)

Hydrology & Flood Risk