What should FRAs include?

What should FRAs include?

FRAs must assess the risks of river (fluvial), sea (tidal), surface water, groundwater where appropriate, and all other sources of flooding. Once the risks have been assessed mitigation measures should be identified to reduce or manage the risk on and off site to an acceptable level. In line with Government policy, Sustainable Drainage Systems (SuDS) should always be considered to manage surface water runoff and to prevent it from exacerbating flood risk in new developments.

For advice on the accepted Sustainable Drainage Systems design within Gloucestershire, please refer to national standards for sustainable drainage systems (SuDS).

Your Local Planning Authority (LPA) is responsible for approving any new drainage proposals through planning conditions. SuDS also help to protect and improve water quality and add amenity value to development. 

View advice on flood proofing. Your FRA should include the pre-development runoff rates and volumes (i.e. the greenfield runoff rates) for the appropriate storm event. The planning application should contain a drainage ‘strategy’ including proposed post development runoff rates and volumes, with reference to all values and factors / parameters used in the calculation.