Key facts
- Climate change is increasing the frequency and intensity of Himalayan disasters, including floods in Nepal.
- Nepal's recent devastating floods have resulted in over 1,000 deaths.
- India, particularly Bihar and eastern Uttar Pradesh, faces significant flood risk from rivers originating in Nepal.
- The severity of flooding in India is influenced by rainfall in Nepal and conditions within India, such as embankment maintenance and drainage.
- Cooperation on information sharing and early-warning systems between India and Nepal is crucial for disaster preparedness.
Scientists are warning that climate change is exacerbating disasters in the Himalayas, leading to intensified floods like those recently experienced in Nepal. These events carry significant implications for India, particularly for flood-prone regions like Bihar and eastern Uttar Pradesh, due to the shared river systems originating in the mountains.
Nepal, with over 6,000 rivers and streams, most of which drain into India, presents a complex flood risk scenario. Major river systems such as the Kosi, Gandaki, and Karnali, along with smaller rivers, contribute to flooding in India. Experts highlight that the severity of flooding in India is not solely determined by water flow from Nepal but also by factors on the Indian side, including rainfall, river levels, embankment conditions, and drainage infrastructure.
The 2008 Kosi disaster in Bihar, which caused nearly 400 deaths, serves as a stark example. It was attributed to the failure of an inadequately maintained embankment rather than an exceptionally high flood volume. This underscores the critical role of infrastructure and maintenance in mitigating flood impacts.
While India can receive warnings of 12 hours to two days for ordinary monsoon floods, flash floods from steeper catchments can arrive within hours. Despite existing data-sharing mechanisms between Nepal and India on rainfall and river levels, significant gaps persist. These include insufficient real-time monitoring stations in critical areas and a lack of a single, shared forecasting model. Furthermore, effective warning dissemination to at-risk communities remains a challenge.
A common misconception is that Nepal "releases" water into India. In reality, Nepal possesses few large reservoirs, and floods are predominantly caused by heavy rainfall in the region, not by deliberate water releases from dams.