Flood alleviation works have started at a Gloucestershire school that was badly hit by the floods of July 2007.
A water storage tank is being installed below the playing field at Cleeve School, Cheltenham, to help reduce the risk of flooding.
Storm water from the school will flow into the tank and reduce the flood risk to neighbouring roads and properties.
The £519,000 county council scheme is expected to be completed by mid October.
The works at Cleeve and eight other schools badly damaged in the floods are being funded by a £1.6m grant from the government after the council appealed for help.
Head teacher Rob Broadbridge said: "This project will help to ensure that the problems that have been experienced in recent years are not repeated, giving peace of mind to local residents and the school alike."
Councillor Stan Waddington, the council's cabinet member for environment, said: "It's over three years since the devastating floods of 2007.
"A number of schools were badly hit and a lot of work has been going on behind the scenes to reduce the risk of flooding like this again."
A number of other school flood alleviation schemes will be starting around the county in the next few months.