‘Rain fences’ as low‑tech flood tool
Coverage highlights Dutch trials of simple home‑mounted ‘rain fences’ as practical, low‑tech measures to manage heavy rainfall and reduce flood risk at the property level. The story frames these as scalable, commonsense adaptations rooted in the Netherlands’ long experience with water management. (x.com)
A Dutch backyard fence is being turned into a water tank, and one version now stores 2,160 liters from a home’s roof instead of sending that surge straight into the street drain. In Veldhoven, a social housing provider installed one for residents Theo and Willy Bolder as part of a neighborhood trial aimed at cutting flood pressure during cloudbursts. (britbrief.co.uk) The setup is simple enough to explain in one pipe: rain from the roof is diverted into stacked plastic modules hidden inside the fence, and the stored water can later be used in the garden. If the modules fill up, the extra water goes back through the downpipe, like an oversized rain barrel built into the property line. (rainwinner.nl) This is showing up in the Netherlands because the country is dealing with both wetter downpours and drier summers at the same time. The Royal Netherlands Meteorological Institute says extreme hourly rainfall intensity is now 10 to 15 percent higher than before 1990, linked to roughly 1 degree Celsius of warming in the Netherlands. (knmiprojects.nl) The Dutch already know what a short burst of rain can do when the ground, pavement, and drains all hit their limit together. In July 2021, parts of Limburg got more than 150 millimeters of rain in 48 hours, and one later analysis put the damage from that event at €383 million. (openrijk.nl, 4tu.nl) The local logic is that sewers are the wrong place to solve every water problem. Eindhoven deputy mayor Rik Thijs said the sewage system cannot cope with the rainfall that is coming and the city cannot simply keep expanding pipe capacity, so more water has to be captured at the surface near where it lands. (britbrief.co.uk) That is why the fence matters more than its size suggests. A tank on one house is small, but hundreds of houses each holding around 2,000 liters remove a meaningful pulse of water from the same drainage network during the same storm. (impactful.ninja, waterportal.ca) The product behind these projects was developed by Dutch entrepreneur Harry den Hartigh after a 2009 downpour flooded his own garden, and his company says the fence modules were designed specifically for small urban gardens where a large underground tank is impractical. The company also says the newer Rainwinner Easy modules are made entirely from recycled plastic. (rainwinner.nl, rainwinner.nl) The economics are deliberately low-tech. Rainwinner’s listed consumer price starts at €499 for two 180-liter modules, which shows the idea is not a giant civil-works project but a modular add-on that can be expanded panel by panel. (rainwinner.nl) The Netherlands has spent centuries building giant defenses against rivers and the sea, but this idea works at the scale of a single row house. Instead of one massive barrier far away, it turns every fence, roof, and garden into a small piece of the flood system. (netherlandswaterpartnership.com, springer.com)
