Surface Water Site Assessment

We can engineer the preferred solution, produce detailed design drawings and specifications, and provide site support during construction.

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We are experts in surface water site assessment.

Where a site has experienced flooding related directly to surface water, we can carry out an assessment and hydraulic modelling of the site to further understand the cause of the flooding and develop a mitigation plan.

Within the hierarchy of flood mitigation, it is preferable to tackle the cause of the issue where possible, rather than symptoms.

We can engineer the preferred solution, produce detailed design drawings and specifications, and provide site support during construction.

Historically, in certain instances, the importance of effective surface water design has been overlooked. Surface water systems may have only been designed for the actual property, as opposed to the site runoff, leading to localised flooding. This can be a particular issue where doors are installed with a low threshold, or there are vast expanses of impermeable paving.

Our process to assess and mitigate the risk includes:

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Surface Water Flood Maps may not account for localised drainage connections, and therefore it may be possible to reduce and mitigate site flood risk through effective surface water drainage design.

At FPS Environmental Ltd, we have worked on projects ranging from smaller residential properties, through to large commercial sites. Options for surface water management may include:

  • Increase drainage capacity
  • New drainage systems (pumped or gravity)
  • Attenuation
  • Permeable paving
  • SUDS

Where the risk is minimised but not completely removed, Property Flood Resilience can also be incorporated to further manage the risk.

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EA surface water flood maps

The Environment Agency (EA) have prepared a technical summary explaining how the Surface Water Flood Maps are derived: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/842485/What-is-the-Risk-of-Flooding-from-Surface-Water-Map.pdf

The flood maps take into account urban highways or surface water drainage by using a standardised “removal” rate, and therefore this may not account for areas where sewers with larger capacity may have been constructed.

The flood maps only consider the effects of rainfall, and do not fully represent the effects on drainage systems or public sewers i.e. surcharge due to limited capacity, or greater removal rate due to larger capacity.

The flood maps are based on a present-day scenario and do not take account of climate change or urban creep.

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