Features / flooding
Bristol’s hidden flood defences
After weeks of heavy rain, behind the scenes, the flood infrastructure most people never see is quietly doing its job.
January has delivered repeated spells of heavy rainfall across Bristol, driven by a succession of winter storms. The downpours have been enough to make many people notice the River Frome, which runs through Eastville Park, a little more than usual. The river has been running high and fast, thick with silt and mud.
Yet, despite the deluge, there have been no major city-wide floods.
This is because a largely invisible network of flood infrastructure, from the Northern Stormwater Interceptor tucked behind IKEA in Eastgate to sluices along the river itself, is quietly protecting large parts of the city when wet weather arrives.
The Northern Stormwater Interceptor, completed in 1962, is a relatively modern piece of engineering.
Nearby, on the corner of Mina Road and Sandbed Road, is a decidedly older reminder of Bristol’s flood-prone history: a 3-foot flood marker, dated 1882 – a steel scar reminding us of a more treacherous time before the flood defence was built.
Subtle changes in the river levels are noticeable to humans and wildlife alike in Eastville Park
Together, they tell a story about how Bristol lives with its rivers – and how much of the work to keep us above the water level now happens out of sight.
For people who use Eastville Park regularly, changes in the river are subtle but familiar.
Stephen Withrington, who walks his dog through the park every day, said he checks the water almost without thinking. It’s not panic that draws his attention, but curiosity.
“It’s fairly high now. But about a year ago, it was almost up to the top of the [bridge] arches. It was probably twice as high as it is now,” Stephen told Bristol24/7.
The flood marker on the corner of Mina Road and Sandbed Road shows the highest water level recorded in archives when the River Frome burst its banks
For many, the river isn’t the main attraction. It’s part of the park’s rhythm. But prolonged rainfall shifts that relationship. Water creeps closer to paths.
Very occasionally the lake does flood, as seen in November 2025, and detours have to be taken. The park feels slightly less predictable.
Chris Moshiri, a budding photographer from Eastville, comes to the park less often. Maybe once or twice a month. But when he does, he spends time moving slowly along the lake and riverbank, camera in hand.
“There’s just an abundance of birds and squirrels here compared to other places in Bristol,” he said.
He thinks part of it is how wildlife has adapted to the steady presence of people.
Stephen Withrington, who often walks with his dog, Star, on Wickham Bridge, said he “always” notices the river level
“The birds here are really used to humans,” said Chris. “In other spots, you get anywhere near them and they fly off. Here, they don’t really. They’ve integrated into the park.”
The river is a big part of that draw. Chris has seen the water rushing fast after heavy rain, but says he’s never witnessed a dramatic flood.
Chris added: “It was gushing the other day. High and muddy – definitely a ‘don’t fall in’ situation. But it still felt contained.”
If the park were to disappear, he knows exactly what would be lost.
“All the birds and wildlife,” he said. “It’s so central. People can just come down and experience it.”
Photographer Chris Moshiri said he has been on the lookout for a kingfisher near the river
Not everyone comes to Eastville Park to linger. Daniel Ziyaee rides his scooter through the park every day on his way to college, cutting through because it’s faster.
“Even in wet weather, the paths tend to remain usable, if a bit muddy, and I can ride my scooter fine.”
The park works for everyone – including commuters and photographers – because of its multifaceted uses: as a green space, a reliable route and a protective buffer.
That sense of containment is not accidental. Much of the River Frome through Eastville is carefully monitored and managed, even when it appears wild.
Daniel rides his scooter almost every day through Eastville Park
Chair of the economy and skills committee and councillor for Hengrove and Whitchurch Park told Bristol24/7: “A large storm relief tunnel on the River Frome by New Stadium Road provides flood protection to the city centre.
“When there’s a significant increase in the flow of water in the River Frome, it is intercepted by the storm relief tunnel and water is redirected into the River Avon near Black Rocks.
“There is a gauge that measures the height of the River Frome in Frenchay. When water levels reach a certain height at this location, the sluice gates that control the flow of water open on the storm relief tunnel to redirect flows away from the centre of Bristol.
“Since the construction of the storm relief tunnels, flood risk has remained broadly the same. However, climate change scenarios indicate significant increases in rainfall intensity and duration over the next 100 years, which will have significant impacts on drainage and river systems.”
Essential infrastructure like this will, therefore, only become more important.
The council, Brown said, have secured grant funding in 2022 from the Department for Environment, Food and Rural Affairs (Defra) to look at different ways to manage imminent flood risk within the River Frome catchment.
“To date, a number of Natural Flood Management (NFM) measures have been installed in the upper reaches of the River Frome to try and slow the speed at which water runs off the land,” said Brown. “We’re installing Sustainable Drainage (SuDS) systems at two schools in Bristol and one school in South Gloucestershire, which will assist in slowing water runoff from the school sites and clean the water that will eventually end up in the River Frome.”
Becca, who walks in the park with her friend and dog Una, feels there’s a “real sense of community” in the area
Brown continued: “We have also installed new telemetry monitoring equipment on the River Frome in the centre of Bristol, which will provide us with better data on river flows that will improve how the water levels of the Floating Harbour are managed.
Rising water can disrupt habitats, but it can also refresh them – depositing nutrient-rich sediment, reshaping riverbanks, and supporting wildlife. The challenge is balance: protecting homes and roads without stripping the river of its natural character.
For Becca, who visits daily with her dog Una, those trade-offs feel tangible.
“When it’s really wet, the path around the lake floods and you can’t get through,” she said. “But it only happens once or twice a year. Most of the time, it feels really looked after.”
She credits council teams and volunteers alike.
“If you report something, they deal with it,” Becca added. “And Friends of Eastville Park do a lot behind the scenes. The bins are never overflowing.”
Standing by the old flood mark on Mina Road, it’s hard not to think about how different flooding, at least in east Bristol, looks now. Not absent, exactly. But anticipated, managed, absorbed.
Eastville Park does more than offer green relief in a dense part of the city. It slows water. It holds space. It quietly protects neighbourhoods far beyond its boundaries.
As the rain eases and the river continues its steady movement eastwards, there’s something reassuring in that invisibility. The absence of catastrophe is, in this case, the story.
In wet times, Eastville Park reminds us that living with a river doesn’t always mean dramatic floods or emergency sirens.
Sometimes, it means noticing what didn’t happen – and recognising the hidden systems, human and natural, that made that possible.
All photos: Kiran Dhami
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