Flood Risk Assessment, Eastgate, County Durham
Nov 28, 2014

RAB Consultants has completed a Flood Risk Assessment in accordance with National Planning Policy Framework in support of a planning proposal in County Durham to convert and extend an existing building into a holiday cottage and directly replace a second building like for like.

The development site is partly located within Flood Zones 2 and 3 in accordance with the Environment Agency’s Flood Map for Planning (Rivers and Sea); a Flood Risk Assessment was therefore required for this site.

RAB Consultants carried out both a site visit to assess the flood risk within the local area and a topographic survey to establish ground levels across the proposed site and along potential evacuation routes from the site. 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 Wear;

  • Liaison with the Environment Agency, Durham County Council and Northumbrian Water; and

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

A comparison of flood levels against ground levels obtained across the site indicates that the site is not expected to experience flooding during the 1 in 100 year (plus climate change) return period flood event. Appropriate finished floor levels were recommended to ensure they achieve a level 300 mm above the 1 in 100 year (plus climate change) flood level.

A flood warning and evacuation plan is included in the assessment ensuring that all staff and visitors to the site are aware of the flood risk and indicating the most appropriate evacuation route to higher ground in Flood Zone 1.

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