Ladakh taps 18,000-Ft glacier stream to save shrinking Tso Kar lake

In a major high-altitude ecological intervention, the Administration of Union Territory of Ladakh has launched a mega project to revive the iconic Tso Kar Lake by channelizing untapped meltwater from the Rupsho Kharnak glacier stream.

Situated at an altitude of nearly 15,000 feet in the Changthang region, Tso Kar Lake—a vital habitat for migratory birds, including the famed, Black-Necked Crane—has shrunk by nearly 70% over the past decade. The lake's surface spread has come down drastically from roughly 11,000 acres to just 3,200 acres, drying up surrounding pastures and forcing local Pashmina goat herders to travel up to 75 kilometres in search of viable grazing grounds.

The revival plan, conceived by Lieutenant Governor VK Saxena following a visit to the region on August 10, envisages redirecting an average of 132 cusecs—or 320 million litres per day—of glacier water originating at 18,000 feet. Currently, this volume of runoff flows unused into the Sindhu River. Officials estimate that fully utilizing the stream will restore Tso Kar to its original glory within one year.

To protect the fragile high-altitude ecosystem, the project avoids constructing heavy concrete canals. Instead, engineers are utilizing gravity flow and simple, low-cost earthworks to guide the water through a cascading sequence of three natural depressions measuring 270 acres, 24 acres, and 10 acres. Equipped with check dams and reinforced cement concrete (RCC) outlet pipes, these depressions act as natural sedimentation basins, allowing silt to settle before pure water enters the lake via a 400-meter final stretch.

Beyond saving the main lake, the cascading system will hold approximately 1,230 million litres of water across three newly formed freshwater wetlands visible from the Leh-Manali Highway. These water bodies are expected to serve as new tourist spots while immediately restoring bird habitats and local groundwater levels.

The engineering approach marks a departure from standard public works protocols in cold-desert terrains. Following initial surveys by the Public Health Engineering (PHE) department that recommended constructing an 11-kilometer RCC canal, the LG intervened to reject heavy civil works in favour of eco-friendly earthworks and the repair of a defunct 1995 concrete channel. Executed on a war footing to beat the severe winter freeze—when ambient temperatures routinely drop to minus 30 degrees Celsius—the strategy demonstrates that high-altitude climate adaptation can be achieved rapidly using minimal infrastructure footprints.

Physical work began on September 2, with 20 cusecs of water redirected to the primary depression starting September 9, filling 20% of its area in just four days.

Highlighting the project’s significance, LG Saxena stated that transforming untapped glacier water into permanent lifelines provides a sustainable blueprint for high-altitude ecological restoration. Beyond ecological recovery, the revival promises critical socio-economic relief by restoring local pastures, allowing displaced Pashmina herders to return to their traditional homelands.