Turning legally-protected riverbank corridors into living, self-financing botanical infrastructure — water that purifies itself, in public.
Restoring the Bagmati has been attempted for years. What is different now is not the ambition — it is the alignment. A rare, closing window where land, budget and need point the same direction.
Riverbank setbacks are now fixed as permanent no-build land. The contested land question is closed — but the land-use question is wide open.
A national infrastructure push has created real demand for solutions that deploy fast and show measurable results inside a single fiscal year.
Despite decades of clean-up drives, the river remains biologically lifeless. The real prize is unclaimed — and waiting for a credible plan.
From its clean source at Sundarijal to the Chovar gorge, the Bagmati gathers the valley's untreated sewage — through Guheshwori, Pashupati, Thapathali and Teku. Decades of unplanned growth overwhelmed sanitation, while cleared buffer corridors sit empty and re-encroach the moment they are vacated.
Long before pumps and chemicals, the valley moved, stored, filtered and delivered water through the ground itself. AquaSai rebuilds that same continuous system as living technology.
Surface flow → percolation → groundwater flow → clean spout. Nature did the treatment. We simply forgot the lesson — and AquaSai makes it living again.
Rather than leaving the buffer as a demolition line, AquaSai transforms these exact corridors into carbon-negative Multi-Stage Recirculating (MSR) constructed wetlands, presented as public botanical parks.
This bypasses high-CAPEX concrete treatment in favour of engineered bio-filtration, modelled before a single bed is dug.
Flow, retention time and biochemical degradation are simulated against the real riverbank topography — filtration is optimised before construction begins.
Valley-native wetland flora — narkat reed, pater cattail and khar grasses — form a biological mesh that filters heavy metals and breaks down runoff before it reaches the river artery.
No massive contiguous land or central piping. Beds deploy in fragmented, irregular strips — exactly the shape cleared buffer corridors take.
| Impact Vector | Public Benefit |
|---|---|
| Socio-political | Replaces volatile, empty buffer strips with beloved, accessible botanical parks — visible goodwill within a single fiscal cycle. |
| Ecological | Documented, measurable reductions in BOD, pathogens and chemical load before water ever reaches the main river. |
| Economic | A fraction of the CAPEX & OPEX of grey infrastructure — plus tourism, events and water-reuse revenue. |
| Enforcement | A planted, occupied, publicly-used corridor self-polices against re-encroachment. The park is the boundary. |
A live AquaSai system protecting marine ecosystems at Koh Phangan, Thailand.
Owned and operated by the communities they serve — durable local jobs.
MSR Master PRO trains local hands to build, plant, operate and maintain.
HYDRUS-CW2D simulator & MSR Visualizer for independent local design.
A single pilot is deployable within one fiscal year, then replicated strip by strip along the river.
We are not asking for funding.
We are asking for a mandate — and 15 minutes.
A 15-minute technical session — a live HYDRUS-CW2D flow demonstration on a real Bagmati corridor.
Authorise one cleared corridor as a demonstration park, deployable within this fiscal year.
A replication mandate to roll out, strip by strip, along the Bagmati and Bishnumati.