Flood Risk Assessment

Level 1 Strategic Flood Risk Assessment (SFRA)

In December 2007 Gloucestershire County Council, in partnership with its Local Authorities, commissioned Halcrow to produce a Level 1 Strategic Flood Risk Assessment (SFRA) in accordance with Planning Policy Statement 25 (PPS25).

The purpose of the SFRA is to assess and map all forms of flood risk from groundwater, surface water, impounded water bodies, sewer, river and tidal sources, taking into account future climate change predictions, to allow the Councils to use this as an evidence base to locate future development primarily in low flood risk areas. The outputs from the SFRA will also help the Councils to prepare sustainable policies for the long-term management of flood risk.

Strategic Flood Risk Assessment (SFRA) documents

For further details please view the following documents:

 Flood risk maps

Flood risk maps

Lydney Level 2 flood risk report

This study refines and builds upon the work undertaken in the Level 1 SFRA, which included an assessment of flood risk from all sources.

There are numerous potential development sites in south-east Lydney and the Plummer’s Brook, a tributary of the River Lyd, flows in close proximity to these sites. The existing Flood Zone maps for this watercourse are course in nature and require improvement in order to appropriately guide the Sequential Test process, driving the need to undertake a Level 2 SFRA.

This study, therefore, includes detailed modelling of the Plummer’s Brook to provide flood hazard information for a range of return periods. In addition, the study determines of the suitability of the potential development sites surrounding Lydney which may be taken forward to development in the future. Their suitability for development has been assessed against flood risk information, to assist the Council with the Sequential Test process. Relevant policies for the management of flood risk and appropriate development of flood risk areas along the Plummer’s Brook are also put forward. The Environment Agency has been consulted throughout the study to ensure that the approach is robust and meets best practice.

For further details please view the following documents:

Lydney flood event maps

Cinderford Level 2 flood risk report

The study refines and builds upon the work undertaken in the Level 1 SFRA, which included an assessment of flood risk from all sources.

The need to undertake a Level 2 SFRA for Cinderford is driven by the need to refine the existing flood Zone information through Cinderford, so that informed decisions can be made on the location and nature of future development, considered as part of the Council’s Local Plan. The existing flood zones have been derived from the Environment Agency’s national broadscale modelling and include some inaccuracies, including misalignments, which have required improvement in order to better inform the Sequential Test process, and where required, the Exception Test.

This study therefore provides robust Flood Zones, as well as flood hazard information, for a range of return periods, in order to inform application of the Sequential and Exception Tests (by the Council). Relevant policies for the management of flood risk and appropriate development of flood risk areas in Cinderford are then put forward.

 

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