Lewes was devastated by the floods in October 2000

The Environment Agency is to start on the first phase of the scheme, which will cost �1.8m, concentrating on the Mallings Brook section.

New embankments and floodwalls are also be built on the River Ouse from the Mayhew Way flyover to Phoenix Causeway.

The town was hit by devastating floods in October 2000 which caused �800m damage.

It will be a moment in history in the making and one that should bring a new and safer future to the ancient and picturesque town of Lewes Peter Midgely, Environment Agency

About four inches of rain fell in the space of 12 hours.

The Environment Agency said such flood defence work would normally take up to 10 years to complete, but it brought the scheme forward because of losses suffered by the people of Lewes.

Peter Midgely, from the agency, said: "I am fully aware that much work still needs to be completed elsewhere in the town and we will do out utmost to bring other areas improved flood defences as soon as we possibly can.

"In the meantime, we will work to ensure we do not pass flooding from one area of the town on to another."

The scheme is to be officially started by the town's MP Norman Baker and Peter Doran, the chair of Sussex Local Flood Defence committee.

Mr Midgely said: "I hope as many people as possible will be able to be present when the scheme is officially started.

"It will be a moment in history in the making and one that should bring a new and safer future to the ancient and picturesque town of Lewes."