Flood Risk Assessment, Peterlee, County Durham
Oct 27, 2014

RAB has completed a Flood Risk Assessment in support of a change of use planning proposal for four large office buildings in County Durham.

Although the site is located within Flood Zone 1 in accordance with the Environment Agency’s Flood Map for Planning (Rivers and Sea), the total site is greater than 1 hectare; a Flood Risk Assessment was therefore required.

RAB Consultants carried out a site visit and topographic survey to assess the flood risk within the local area. An ordinary watercourse was found to run past the southern boundary of the site. The site visit revealed the water level of the watercourse to be approximately 101.58 m AOD, some 17.6 metres below the lowest part of the development site. The fluvial flood risk to the site was therefore determined to be very low.

Analysis of surface water flood risk to the site concluded that buildings are unlikely to be affected and that overland flow routes are shown to route water south across the site into the ordinary watercourse.

Our assessment to meet the requirements of the National Planning Policy Framework also involved:

  • Data collection;

  • Liaison with the 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.

Due to the nature of this development, the building footprint will not change and no external alterations are proposed. As a result, impermeable areas will not alter and the introduction of SuDS techniques were not considered appropriate within this report.

The development was considered to be appropriate given the flood risk and it is not expected to increase flood risk elsewhere.

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