Flood risk and sustainable drainage

Flood risk and sustainable drainage

As a planning applicant, you may need to carry out a flood risk assessment for your proposed development site. For major applications, all applications are required to have sustainable drainage systems for the management of surface water runoff, unless demonstrated to be inappropriate.

Flood Risk Assessments (FRAs)

In accordance with the Core Strategy policy CS26 (Flooding), Flood Risk Assessments (FRA) will be required for sites at risk from all sources of flood risk e.g. river, surface water and ground water flooding. An FRA should be undertaken by a suitably qualified person, such as a drainage engineer.

To assist in the implementation of CS26 and the submission of FRAs the Council has prepared a Flood Risk SPD which was adopted on 3 May 2016. As part of this document the following proforma and template have been produced.

  • For major schemes, in conjunction with an FRA, the Council will expect an FRA Proforma to be completed.

  • An FRA template for small scale proposals, including householder extensions.

The level of detail required within an FRA must be proportionate to the type of development proposed and the level of flood risk. Please note, this will be more than the Environment Agency Standing Advice.

Sustainable Drainage Systems (SuDS) 

All major planning applications are expected to have sustainable drainage systems for the management of surface water runoff, unless demonstrated to be inappropriate. Major development is development involving any one or more of the following:

(a) the winning and working of minerals or the use of land for mineral-working deposits;

(b) waste development;

(c) the provision of dwelling houses where:

     (i) the number of dwelling houses to be provided is 10 or more; or

     (ii) the development is to be carried out on a site having an area of 0.5 hectares or more and it is not known
          whether the development falls within sub-paragraph (c)(i);

(d) the provision of a building or buildings where the floor space to be created by the development is 1,000 square metres or more;

(e) development carried out on a site having an area of 1 hectare or more.

The Council will expect a SuDS proforma, completed and signed by a competent drainage engineer (recognised by the Engineering Council, the Institution of Civil Engineers or equivalent), to be submitted with the technical evidence as part of the planning application.

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