Strategic Flood Risk Assessment

Strategic Flood Risk Assessment
In accordance with advice from the Environment Agency the Council, jointly with Broadland District Council, The Broads Authority, Norwich City Council and South Norfolk District Council, commissioned a Strategic Flood Risk Assessment (SFRA) to inform preparation of the LDF and also to provide further details of varying levels of flood risk within the area.

The Environment Agency advised that Strategic Flood Risk Assessments should be carried out in two parts:

Stage 1 - An Inception Report which provides details on the information available and the specific issues facing each authority. The inception report forms the basis for procurement for the stage 2 Strategic Flood Risk Assessment. JBA consultants were appointed to carry out stage 1 and the report is available to view below:

• Stage 1 Inception Report

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Stage 2 - The Strategic Flood Risk Assessment (assessment work and presentation of findings). TA Millard East Anglia were appointed to carry out the stage 2 report which was finalised in Spring 2008.

The flood probability maps contained in the North Norfolk part of the SFRA indicate flood zones 2, 3a and 3b for certain North Norfolk river systems, including where the rivers are tidally influenced. The maps also show where this flood risk status may increase as a result of climate change, based on the recommended contingency allowances for net sea level rise and increases in peak rainfall intensities, peak river flows etc contained in Annex B of PPS25.
The SFRA did not map flood risk associated with all North Norfolk rivers and the Environment Agency flood maps will need to be referred to for those areas not included.

Certain areas are also at risk of direct flooding associated with failure or overtopping of coastal defences. Information relating to the risk of coastal flooding is available from the Environment Agency maps, rather than the SFRA, and these may need to be referred to for settlements which are subject to both fluvial and direct tidal flooding, such as Catfield, Hickling, Horsey, Ludham, Potter Heigham, Stalham and Sutton.

The direct flood risk from tidal inundation is indicated in the SFRA through specific coastal breach scenarios (at Wells, Morston and Sea Palling) which illustrate the impacts of a breach in those particular locations. The placement of individual breach locations does not imply a weakness in the defences, but is intended to show the scale of flooding that could occur from a single breach in those specified locations. The SFRA does not model all possible breaches that could occur and the Environment Agency flood maps need to be referred to in order to assess the risk to the wider area from a coastal breach / overtopping.

The SFRA maps and reports are intended for guidance only and are not designed to be accurate at the individual property level. If considering development you should contact the Environment Agency and the Local Planning Authority for advice.

When viewing the SFRA images you do so understanding the above and the context in which these images have been created, i.e. as part of the Greater Norwich Development Partnership and North Norfolk District Council SFRA, and they do not imply any specific vulnerability or likelihood of flooding other than in the context expressly stated in the Strategic Flood Risk Assessment SFRA document. The SFRA maps do not reflect depths of water that could be reached in existing property, as no allowances are made for individual property construction details.

TA Millard Ltd asserts its copyright of these images, and unauthorised use is not allowed. If you wish to continue you do so on the understanding that by registering for access you have agreed to the above conditions.