For decades, the cold desert of Ladakh struggled with severe water shortages despite being surrounded by snow covered mountains. With annual rainfall of less than 100 millimetres, farmers relied on melting glaciers to irrigate crops such as barley, apples and vegetables. However glaciers usually began melting only in summer while crops needed water much earlier during the spring sowing season. As climate change accelerates glacier retreat and makes rainfall increasingly unpredictable region’s water crisis has become even more serious.
Birth of the Ice Stupa
To solve this seasonal water shortage, engineer and education reformer Sonam Wangchuk introduced an innovative idea known as the “ice stupa” around 2014-15. The concept stores excess water flowing from mountain streams during winter by channeling it through pipes. In the freezing temperatures of Ladakh, the water forms a tall cone shaped tower of ice, resembling a traditional Buddhist stupa.
The unique cone shape is not only symbolic but also scientifically effective. It exposes less surface area to sunlight, allowing the ice to melt slowly over several weeks instead of disappearing quickly like a flat sheet of ice. This gradual melting releases water exactly when farmers need it most during the planting season.
Low-Cost Climate Solution
The first ice stupa prototype stored around 150,000 litres of water, while larger versions soon expanded capacity to nearly 1.5 million litres. Today, more than a dozen artificial glaciers have been built across Ladakh, collectively storing tens of millions of litres of water and helping irrigate thousands of trees and crops.
Developed with the support of students, local communities and partner organisations, the ice stupa requires no electricity or expensive technology. Instead, it works entirely by using gravity and the region’s naturally cold temperatures.
The innovation has received international recognition for demonstrating how simple engineering and traditional knowledge can help communities adapt to climate change. Today, the ice stupa has become a global example of sustainable water conservation, inspiring similar projects in other mountainous regions facing shrinking glaciers and growing water scarcity. It shows that working with nature, rather than against it, can provide practical and affordable solutions to some of the world’s biggest environmental challenges.