The traditional assessment of flood risk is based on river levels (fluvial flooding) and coastal flooding. However, recent experience has shown the impact and potential impact of pluvial flooding, whereby local ground conditions and / or topography cannot handle severe rainfall over a sustained period of time. This project therefore aims to develop an improved understanding of how pluvial flooding (or flash flooding) could affect National Grid Transmission assets. For electricity transmission, these include towers and substations; while, for gas transmission, these include metering offtakes, block valve sites, multi-junctions and compressor stations.

Objectives

This is a joint project with National Grid gas transmission to:

• Gain an understanding of which of National Grid's substation sites and towers are at risk from Pluvial or flash flooding

• Understand which of National Grid's electricity Transmission assets are at risk and the risks associated with dam and reservoir failure to tower bases and substation sites

• Understand which towers safety clearance levels may be jeopardised through flooding

• Have available on National Grid transmission GIS system data showing the potential fluvial, pluvial flooding and inundation maps for planning and risk assessment purposes.