India's Water Bodies Shrinking: Study Reveals Alarming Trend

A comprehensive study by IIT-Gandhinagar, analyzing satellite data from 1990 to 2017, indicates that nearly half of India's inland water bodies have experienced a significant decline in surface area. Researchers found that 44.8% of the 10,476 tracked water bodies shrank, while 28.7% expanded. The study highlights that consecutive dry seasons, such as a weak monsoon followed by a dry winter, compound water loss more severely than single drought events.

Small water bodies, less than one square kilometer, are disproportionately affected due to their shallow depth and higher evaporation rates. They shrank by approximately 14% during dry periods, compared to 10-12% for larger water bodies, demonstrating greater resilience in bigger systems. The most pronounced declines were observed in semi-arid central India and major river basins.

In contrast, some Himalayan lakes expanded due to increased glacial melt, though this trend raises concerns about long-term water security and potential flood risks. The findings underscore the urgent need for water conservation programs like Jal Shakti Abhiyan and MGNREGA to consider cumulative drought effects and prioritize the monitoring and preservation of existing small water bodies.

Researchers advocate for closer monitoring of village ponds and reservoirs, which are crucial local water sources. Satellite-based tracking can help identify vulnerable water bodies early, guiding restoration efforts before seasonal shrinkage leads to permanent loss. Planning must adapt to the reality of compounding dry seasons for effective water management.