Water Shortage Feared As Snow In HKH Hits A Record Low
A representation of the documented hazards related to cryosphere and hydrosphere in the HKH. Illustration from Water, ice, society, and ecosystems in the Hindu Kush Himalaya, ICIMOD
According to a new report, the Hindu Kush Himalaya is experiencing significantly lower snow persistence in 2024, raising serious concern over water security for downstream communities.
Leading experts from the International Centre for Integrated Mountain Development (ICIMOD), a Nepal-based intergovernmental organisation, have urged water management officials to initiate preemptive emergency water supply measures and drought management strategies.
It is pertinent to mention here that the Hindu Kush Himalaya (HKH) region heavily depends on the cryosphere – frozen water on the Earth’s surface, including snow, permafrost, and ice from glaciers, lakes and rivers. This frozen water is a critical source of freshwater for around 24 crore (240 million) people living in the HKH region and has far-reaching benefits for around 165 crore (1.65 billion) people downstream.
Snowmelt is responsible for around 23 per cent of the total water flow of 12 major river basins which originate in the HKH. However, its contribution varies from river to river. It represents 77 per cent of the Helmand river’s flow, 74 per cent of the Amu Darya river’s flow and 40 per cent of the Indus river’ flow.
Monitoring reveals that snow levels are almost a fifth below normal across the region this year, with the most dramatic declines seen in the west, where its contribution to water supply is at the highest.
According to the Snow Update Report – 2024, released on Monday, 17 June, snow persistence dropped 17 per cent below normal in the Ganga basin and 14.6 per cent below normal in the Brahmaputra basin.
The most significant drop in snow persistence was seen in the Helmand river basin at 31.8 per cent below normal. The previous lowest level was in the year 2018, with a 42 per cent reduction.
The Indus river basin has fallen to 23.3 per cent below normal, the lowest level in 22 years. The previous lowest level for this basin was in the year 2018, with a 9.4 per cent shortfall. In the Mekong basin, snow persistence was around 1 per cent below normal, making it the smallest variation from normal.
ICIMOD cryosphere specialist Sher Muhammad, who is also author of the report, said, “We have seen a pattern of decreasing amounts and persistence of snow across the Hindu Kush Himalaya, with 13 of the past 22 years registering lower-than-normal seasonal snow persistence.”
Muhammad said, “This is a wake-up call for researchers, policymakers and downstream communities. Lower snow accumulation and fluctuating snow levels pose a serious increased risk of water shortages, particularly this year.”
According to Miriam Jackson, ICIMOD’s senior cryosphere specialist, agencies must take proactive steps to address possible drought situations, especially in early summer. Jackson said, “Plans must be updated to accommodate water stress, and communities need to be notified of the risks. Beyond that, it’s clear that governments and people in this region need urgent support to adapt to changes in snow patterns that carbon emissions have already locked in. G20 countries need to cut emissions faster than ever before to prevent even more changes that could prove disastrous to major population centres and industries reliant on snowmelt in the mountains.”
Experts are of the view that promoting rainwater harvesting and establishing local water committees may help mitigate the immediate impacts of below-normal snowfall on the water supply in the HKH region.
However, in order to ensure long-term resilience to climate change, countries sharing trans-boundary rivers must collaborate to update their water management laws. Experts said that such actions are crucial to addressing water shortages in south Asia, which relies on snowmelt.
