A Flood Risk Assessment (FRA) evaluates the potential risk of flooding for a proposed development site. It isoften required as part of a planning application when building in areas identified as having a potential flood risk.
At Gradwell Environmental, we provide professional flood risk assessments for residential and commercial developments, helpingensure compliance with planning requirements and supporting successful planning approval.
Our reports assess the likelihood of floodingfrom rivers, surface water, groundwater and drainage systems, andprovide practical mitigation strategies where necessary.
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When Is a Flood Risk Assessment Required?
A flood risk assessment is typically required when:
Adevelopment is located in Flood Zone 2 or Flood Zone 3
A site is larger than 1 hectare in Flood Zone 1
A development could affect drainage or increase flood risk elsewhere
Requested by the Local Planning Authority (LPA)
Planning authorities use flood risk assessments to ensure new developments are safe from flooding and do not increase flood risk to surrounding areas.
What Does a Flood Risk Assessment Include?
A professional flood risk assessment will typically include:
Identification of flood zones and flood sources
Assessment of river, surface water, groundwater and sewer flooding
Review of historic flood data
Analysis of site topography and drainage
Impact of the development on surrounding areas
Flood mitigation and management recommendations
The report demonstrates how the developmentcan be made safe for its lifetime without increasing flood risk elsewhere.
Flood Zones Explained
Flood zones classify the probability ofriver or sea flooding:
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