Flood Risk Assessment, Sheffield, South Yorkshire
Jan 16, 2015

RAB has completed a Flood Risk Assessment in accordance with National Planning Policy Framework in support of a proposed warehouse extension in Sheffield.

The river Don flows in a north easterly direction approximately 200 metres east of the site. The Environment Agency’s Flood Map for Planning (Rivers and Sea) indicates that the site is located within Flood Zone 3; a Flood Risk Assessment was therefore required for this site.

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 recently modelled flood data for the river Don in Sheffield;

  • Liaison with the Environment Agency, Sheffield City Council and Yorkshire Water; and

  • An assessment of the risk of flooding from all sources including fluvial, surface water, groundwater and drainage related.

The site is thought to be most at risk from fluvial flood waters that come out of bank at an upstream location on the river Don. The development proposal involves an increase in building footprint on the site therefore flood plain compensation should be considered. However, it is evidenced within the report that the site is within an area benefitting from upstream flood defences and therefore does not require compensatory flood storage.

The report provides a flood warning and evacuation plan and recommends that finished floor levels for the new extension are set in line with existing warehouse floor levels.

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