Flood Risk Assessment for school in Haringey, London
Aug 28, 2015

RAB has completed two Flood Risk Assessments (FRA) for a school in the London Borough of Haringey in accordance with the National Planning Policy Framework.

The first FRA is for an extension of the existing educational building and the development of the landscape in order to promote biodiversity. 

The second FRA was carried out for a development of 38 affordable apartments and 35 private and shared ownership apartments.

The Environment Agency’s Flood Map for Planning indicates that the site is located within Flood Zone 1 (low probability flooding) but as the site is greater than 1ha, a flood risk assessment was required.

RAB Consultants carried out a site visit to assess the flood risk within the local area. Our assessment to meet the requirements of the National Planning Policy Framework also involved:

  • Data collection, including the Environment Agency’s most recent flood maps, Thames Water sewer records and topographic survey;
  • Liaison with the Environment Agency, Haringey Council; and
  • An assessment of the risk of flooding from all sources including fluvial, surface water, groundwater, reservoir and drainage infrastructure.

Both sites are thought to be most at risk from surface water as the Environment Agency Maps shows there is a medium risk of surface water flooding at the site. RAB proposed a combination of sustainable drainage techniques (SuDS) and raising finished floor levels to mitigate against the risk.