Every monsoon, Indian cities brace for the same story. Roads disappear under water, traffic comes to a standstill, and millions of litres of rainwater flow away into drains before they can be put to use.
But what if the very roads we drive on could help solve both flooding and water scarcity?
That is the idea behind Eco Bloc, an innovation pioneered by entrepreneur RR Sivaram. Inspired by the devastating Chennai floods of 2015 and the severe drought that followed in 2019, he envisioned a smarter drainage system — one that doesn’t simply channel rainwater away, but captures and stores it for the future.
A drain that harvests rain
Unlike conventional concrete stormwater drains, Eco Bloc is built from recycled plastic and includes built-in rainwater-harvesting structures spaced every 15 metres. Its unique honeycomb design allows it to capture up to 96 per cent of rainwater, helping reduce urban flooding while conserving a precious resource.
Built from recycled plastic, Eco Bloc filters and harvests rainwater while reducing urban flooding and strengthening water security. Photograph: (Instagram/@stonehandsproject)
The collected rainwater passes through a four-stage filtration system that removes silt and debris from the roads. Once filtered, the clean water is stored in underground tanks hidden beneath roads and parks.
These modular tanks are designed for urban conditions. Strong enough to bear up to 60 tonnes of weight, they have a lifespan of over 50 years and can be reused, recycled and even relocated when needed.
Turning flooded streets into water banks
Beyond conserving water, the system also offers cities a cost-effective way to tackle flooding. Eco Bloc can reduce urban flooding while being 15 to 20 per cent cheaper than conventional stormwater drain systems.
Its impact became evident with its very first installation in Chennai in 2020, where it helped revive a temple tank that had remained dry for 12 years in just one year.
Inspired by Chennai’s floods and droughts, RR Sivaram’s Eco Bloc reimagines stormwater drains as long-term water storage infrastructure. Photograph: (Instagram/@stonehandsproject (Enhanced with AI))
Today, the solution has been installed at over 5,000 locations across India, harvesting more than 50 million litres of rainwater.
As India’s cities prepare for another monsoon, solutions like Eco Bloc offer a reminder that the season can bring more than waterlogged streets.
With thoughtful design and local innovation, every spell of rain becomes an opportunity to replenish groundwater, strengthen water security, and build cities that are better prepared for the future.
