From source to sea, in three phases
Chennai Blue Vision 2030 isn't one big-bang project. It's a sequence — each phase proving itself before the next begins, and each stretch of river paying part of its own way.
Section summary: This page is the three-phase roadmap to restore the Cooum from source to sea. The aim is cleaner water, healthier banks, and public access, funded in partnership rather than as a single city expense.
Three phases, mapped downstream
This is our proposed sequencing as a foundation, not an official government timeline — it's the order we'd argue for, and the order we're organising volunteers and partners around.
Stop the damage
Close the remaining untreated sewage inlets, restart consistent desilting, and get solid-waste collection working at the points where the river is dumped on most. Nothing downstream matters until this stretch holds.
Rebuild the banks
Replace bare, dumped-on embankments with planted buffers, stepped stone banks and a continuous walking path — the green corridor shown in our concept visuals, built stretch by stretch as funding from Phase 1's results comes in.
Open it to the city
Boat access, riverfront squares and controlled development along the reclaimed banks — the phase that turns restoration into an amenity Chennai actively uses, and that generates the value to sustain the whole project.
A 25-lake network feeds the basin
The Cooum doesn't recover on its own — it's fed by a wider network of lakes and tanks across the basin. Reviving the river means reviving them too, in step with the state's own Cooum River Revival vision.
Restoring flow between these waterbodies improves flood buffering, recharges groundwater and feeds the Cooum a cleaner, steadier channel from source to sea.
15 STP facilities
Sewage treatment plants sized to bring the basin toward 100% treated discharge — closing the untreated inlets that keep the river a drain instead of a river.
5,000+ trees planted
Bio-shore planting stabilises banks naturally, cuts erosion, and rebuilds the tree canopy the corridor lost over decades of encroachment.
5,000+ eco-volunteers
Citizen monitoring keeps every restored stretch accountable — residents watching their own patch of river, lake or canal.
Zero cost. Maximum benefit.
Let the river's own value fund its restoration
Most Cooum restoration proposals have stalled the same way: a large public budget request, competing against every other city priority, for a project whose benefits take years to show. We think that's the wrong ask.
Instead, Chennai Blue Vision 2030 leans on the value a cleaner riverfront creates directly:
Riverfront land uplift
Restored embankments raise the value of adjoining land. A share of that uplift, through partnership agreements, funds the next stretch.
A river people use
Boat rides, promenades and riverside events generate ongoing revenue that keeps the corridor maintained, rather than relying on repeat public spending.
Costs avoided, not just spent
Less flooding, less disease burden from open sewage, and less spent managing the consequences of a polluted river running through the city.
The first stretch starts with people, not budgets
Clean-up volunteers, local partners and early supporters are how Phase 1 gets moving.