WHY FLASH FLOODED IN NEPAL??????? Nepal is a lovely Himalayan country blessed with mountains, rivers, valleys, and a rich natural environment. But its geographical situation also renders it very susceptible to natural hazards. Flash floods, in particular, are one of the more dangerous hazards amongst these and are more likely to occur during the monsoon season. Flash flood: a sudden and rapid increase of water in rivers, streams and low lying areas, frequently after a heavy rainfall in a short time. High mountains, narrow valleys, frequent monsoon rains, landslides and torrential rivers in Nepal can all add up to torrential flooding.
Causes of Flash Floods in NepaL
The main reason why flash floods are frequent in Nepal is heavy rains during the monsoon season. These rains are expected to be intense and persistent from June to September. The overflowing of rivers and streams caused by heavy rainfall makes the hills and mountains slippery and steep, therefore accelerating the water flow and making the floods destructive.
Another significant consideration is Nepal's challenging terrain. There are many mountains and narrow valleys in the country, where the rivers flow with great speed. Natural dams can be temporarily formed by landslides on rivers. The barriers suddenly fail and a huge amount of water and debris can flow downstream. Floods can also be caused by the rapid drainage of glacial lakes or landslide dammed lakes in high mountain regions.
Climate change is also contributing to this growing concern. Increasingly unpredictable rainfall and extreme weather events can make it more difficult for communities to anticipate when severe flooding may occur. The United Nations has called Nepal vulnerable to climate hazards, such as more unpredictable extreme weather events.
Effects on People and the Environment
A flash flood can cause devastating damage in just minutes or hours. Infrastructure, such as homes, roads, bridges, schools, farms, and more, can be washed away. Those who reside near rivers are especially vulnerable as they may have little time to evacuate if river levels rise quickly.
Floods not only cause landslides which add to the danger in mountainous regions but they also pose a danger to agricultural lands and crops resulting into loss of agricultural production and farmers' income. Contamination of drinking-water sources by floodwater and damage to sanitation facilities are also likely to occur and spread waterborne diseases.
The scale of the flood shows how big the problem was. The deadly floods and landslides, which occurred on 27-28 September 2024, claimed 246 lives, injured 183 people and left thousands of people homeless in 21 districts. The landslides and consequent floods caused damage to roads, bridges, health facilities, educational institutions, houses, agricultural and electric utilities.
Flash floods can also have economic impacts. People can lose their livelihood and resources such as farm animals, food, and belongings. Children can miss school, and people may not be able to get medical care, and roads can be damaged causing isolated communities to be cut off from emergency medical services.
Prevention and Preparedness
Although flash floods cannot always be prevented, damage can be minimized by preparing appropriate disaster-management measures. In particular, early-warning systems should be instituted to provide communities with the information they need to make appropriate decisions. For example, communities need to know when heavy rains are likely to occur, rivers are likely to rise, and flooding is likely to take place so that family members and others can be moved to safety before disaster strikes.
The administration and humanitarian groups active in the country of Nepal have started to apply such methods as forecasting and anticipatory action in order to make preparations in advance for imminent floods. This can enable governments and other authorities to take measures such as providing supplies, sending out warnings, and helping vulnerable households in advance of rising waters.
Other measures include the reinforcement of bridges and roads, protection of riverbanks, improvement of drainage, restoration of forests, regulation of uncontrolled construction near rivers and the creation of safe evacuation routes. No less important is raising public awareness, informing residents of possible evacuation routes, having emergency reserves at hand and not attempting to cross a swollen river or floodwater.
Nepal is unable to prevent flash floods entirely; however, it is possible to prepare better for them. Closer collaboration between government agencies, communities, scientists, humanitarian organizations, and international donors is required. Moreover, investment in preparation and preemptive measures will save many lives in the future, and contribute to the country’s security and resilience.
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