Work has started to excavate an estimated 200 tonnes of silt and sand from Queens Park in St Helens.
The project will see huge volumes removed from Windle and Hardshaw Brook.
Officials at the Environment Agency are pumping £15,000 into the project.
A large excavator will be driven on site to remove the silt and sand and it is hoped the work will be completed by the weekend.
Karen Glasgow, Greater Manchester, Environment Agency Operations Manager, said: “Our Operations Teams undertake maintenance work throughout the year to further reduce flood risk.
“This project will benefit the local community by reducing flood risk to approximately 77 nearby properties.
“However, flooding in this area will always be a risk in wet weather so we encourage local residents to check their flood risk online and sign up for our free flood warnings.”