19/07/2026
Kathmandu was a sponge city before the term existed.
Today, cities around the world are trying to move away from the “drain-and-discharge” model, where rainwater is quickly pushed into pipes, drains, and rivers.
The newer idea is simple: capture rain where it falls, slow it down, let the ground absorb it, and recharge groundwater.
But this is not new to the Kathmandu Valley.
For centuries, traditional courtyards, brick-paved alleys, pukhu ponds, rajkulos, and hitis worked together as one living water system.
The ponds stored monsoon rain.
The permeable surfaces allowed water to soak into the ground.
The rajkulos moved water across the valley.
The hitis released filtered groundwater back to communities.
This was not just beautiful architecture.
It was climate infrastructure.
But as recharge zones were paved with concrete, rajkulos were cut by roads, and groundwater was extracted faster than it could recover, Kathmandu began facing two crises at once: flooding during the monsoon and water scarcity during the dry season.
The solution may not be to copy the past exactly.
It may be to learn from it.
From GPR mapping of ancient water channels in Patan to community-led hiti restorations in Lalitpur, Kirtipur, and Godawari, Nepal is already showing how traditional systems can be adapted for modern resilience.
The future of Kathmandu’s water may be hidden in the wisdom of its own streets.
Follow Rivers & Roots for more stories on Nepal’s built environment, water systems, and climate resilience.
