Workmen have moved into Rosebery Avenue to remove silt from a nearby brook which posed a flood risk to residents of the Linden area.
The work, which is part of a £40,000 flood-prevention project, part-funded by Gloucestershire County and Gloucester City councils, has been welcomed by residents and councillors.
Matt Phillips, who lives in neighbouring Ladysmith Road, said: "I was living in Linden in 2007 and was one of the Linden residents who was advised to evacuate my house at that time.
"So I would welcome any improvements they are making to the drainage system.
"If it is outside of rush hours then I see no reason why they shouldn't be able to carry out works if they are essential.
"There are many different routes you could take to avoid roadworks in Linden."
County councillor Mark Hawthorne, whose Moreland ward includes Linden, said he was pleased the work was being carried out.
He said: "Obviously a lot of homes were affected in the area during the floods of 2007.
"It's good to see the city council and county council working together on this.
"And hopefully it will ensure that the local residents are protected should we see a repeat of the July 2007 floods."
Explaining the work, a city council, spokesman said: "A high pressure jet is sent upstream to dislodge any silt in the covert.
"It is then pulled back and the pressure draws the silt back with it.
"The silt is then sucked up into the tank on the truck to be disposed with. Each tank can hold up to seven tonnes of silt."
Peter Jones, Gloucestershire County Council's deputy chief executive, said: "We are pleased to be working with Gloucester City Council to reduce the flood risk to people living in Linden before the bad winter weather sets in.
"This scheme is part of our continuing programme to protect homes from flooding in the future."