MANCHAR Lake, the largest natural freshwater lake in Asia, has historically served as a lifeline for thousands of fishermen, farmers and local communities.
Historically, the lake received freshwater from the Indus River, seasonal hill torrents from the Kirthar mountains, and local rainfall.
These sources maintained the ecological balance of the lake and supported athriving freshwater ecosystem. However, climate change, de clining rainfall, upstream water diversions, and the construction of dams and irrigation structures have significantly reduced freshwater inflows. As a result, the lake has gradually shrunk and become increasingly dependent on polluted drainage water.
One of the most destructive factors behind the decline of Manchar Lake is the discharge of untreated agricultural, industrial and municipal wastewater through the Right Bank Outfall Drain (RBOD) and the Main Nara Valley Drain (MNVD). Instead of getting safely divertedto the sea, a substantial volume of wastewater is discharged directly into the lake.
The ecological consequences of salinity and pollution have been catastrophic.
Environmental experts recommend diverting polluted drainage water away from the lake, restoring freshwater inflows from the Indus River, improving wastewater treatment facilities, regulating agricultural chemical use, and strengthening wetland conservation measures.
Recent scientific studies suggest that restoring freshwater supply while excluding contaminated inflows could significantly reduce salinity levels and improve ecological conditions. Long-term monitoring using satellite technology, sustainable water management, and community participation are also essentialfor successful restoration.
The destruction of Manchar Lake is not only the loss of a natural resource, but also the erosion of biodiversity, culture and livelihoods. Unless urgent and coordinated action is taken by government institutions, environmental organisations as well as local communities, Asia’s largest freshwater lake may continue its sliding path towards irreversible ecological collapse.
Dr K anbhoo Khan Tando Adam