A Flood Survey comprises a site visit and accompanying desktop assessment to obtain as much information as possible relating to a site, including the buildings and people that occupy it, and the surrounding areas.
In order to accurately assess the flood risk, the characteristics of a site must be comprehensively understood.
- The geographical setting must be assessed. This includes reviewing the relative ground levels across the site and with neighbouring areas. Watercourses and water bodies at the site or nearby must be identified, and the characteristics of these features recorded.
- The scale, nature and construction of the built infrastructure at a site needs to be assessed. The assessment should seek to understand where flood water may enter a property and which areas may be more vulnerable, such as the locations of high value items (white goods) or critical supplies such as electricity or gas.
- Understanding the users of a site helps to classify the likely vulnerability to flooding. The assessment should seek to understand who occupies a site, when it is occupied, and which areas are most critical to the occupiers.
- The nature of the existing drainage is important. Are there separate systems for surface water and foul water? What feeds into these systems and where do they drain to? What is the condition of the drainage systems and are there any misconnections? And most importantly, what additional risk might the existing drainage system pose to the site?
- Understanding how neighbouring properties and land may affect the flood risk to the site.
- The flood survey can also used as an opportunity to obtain anecdotal evidence of historic flooding at the site. First-hand accounts are often more reliable than information that can typically be derived from flood maps or flood risk reports.
- The flood survey should also be used as an opportunity to identify areas of uncertainty where further investigation may be necessary to comprehensively assess the flood risk at the site.
All of these elements need to be understood to assess how flooding may affect a site; the potential flood extents, and potential flood impacts. Only once this information is collated can detailed and reliable flood mitigation options be determined.
How can FPS help?
A Property Flood Resilience Survey or Due Diligence report can be completed to assess the risk to a property or site, determine existing flood resistance or flood resilience, and detailing what additional measures could be implemented to minimise the risk.
FPS Environmental Ltd are able to offer Due Diligence Reports and Property Flood Resilience Surveys. A flood survey for an average 3-bedroom home and garden typically takes in the region of 2-3 hours. The flood survey will record as much information as possible both externally and internally.
If you think that you require a Flood Survey to better understand the flood risk at your property, please get in touch to see how we can help.