River Itchen Flood Alleviation Scheme

The River Itchen Flood Alleviation Scheme is a multi-million pound flood defence scheme, developed from the Southampton Coastal Flood and Erosion Risk Management Strategy. The scheme is designed to protect hundreds of homes and businesses within the Northam, St Mary's and Chapel areas of the city centre from the present day, and future tidal flood risks that exist in these areas.

Why is a scheme needed?

At present approximately 400 residential properties, along with many businesses on the west bank of the River Itchen are at risk from a 1 in 200 year flood (a flood with 0.5% chance of occurring in any year). This is because existing quay walls, structures and land levels are not high enough to prevent more extreme high tides from inundating the area.

As a result of climate change and sea level rise, flooding will become more frequent and severe, and if no action is taken to address tidal flooding, the number of residential properties at risk in this area will increase to over 1400 by 2110. Without action, it is possible flood waters could reach depths of 1.5 metres in several areas across Northam, St Mary's and Chapel.

To find out more about the scheme please see: