Sikkim: In North Sikkim, a cloudburst led to an abrupt rise in the water level of the Teesta River, sparking flash floods, with the water level surging to heights ranging from 15 to 20 feet, which resulted in the sweeping away of numerous Army vehicles.
23 Army Personnel Missing
On Wednesday morning, a flash flood in Sikkim’s Lachen Valley caused the disappearance of a minimum of 23 Army personnel. This unfortunate incident also resulted in the submersion of certain Army vehicles, as verified by defense authorities. In response, a search and rescue operation has been initiated. The Army vehicles were stationed near Singtam at Bardang when the flash flood event unfolded. Downstream, the water level surged to heights ranging from 15 to 20 feet. Furthermore, several buildings and structures in Chungthang, North Sikkim, have been swept away by the floodwaters.
Chief Minister Assesses Flood Situation
Following a cloud burst in Singtam, a flash flood warning was issued in Sikkim. Chief Minister Prem Singh Tamang assessed the flood-like conditions in the region.
The previous Flash Flood in June Caused Extensive Damage
In June of this year, the North Sikkim district encountered a catastrophic flash flood as a consequence of intense monsoon rainfall. The Pegong region, in particular, bore the brunt of the deluge, resulting in the complete shutdown of NH10 and extensive harm to the infrastructure along the highway, rendering it unfit for any vehicular traffic. The inundation of nearby rivers, caused by the heavy rainfall, led to the isolation of areas like Lachen and Lachung from the rest of the state.
Common reasons for the occurrence of flash floods.
Flash floods can occur due to a combination of various factors, but they typically result from the rapid accumulation of water in a short period of time. Here are some common reasons why flash floods take place:
Heavy Rainfall: One of the most common causes of flash floods is intense and heavy rainfall over a short period. If the rate of rainfall exceeds the ability of the ground to absorb the water or if it overwhelms drainage systems, it can lead to rapid runoff and flooding.
Sudden Thawing of Snow or Ice: In regions with cold winters, rapid melting of snow or ice, often caused by a sudden increase in temperature or rainfall, can lead to a surge of water downstream, resulting in a flash flood.
Dam or Levee Failures: The failure of dams, levees, or other water control structures can release a large volume of water downstream, causing a flash flood. This can result from structural defects, overtopping, or excessive pressure from heavy rain or snowmelt.
Landslides or Debris Flows: Landslides or debris flows, especially in mountainous areas, can block rivers or create dam-like obstructions. When these natural barriers break, they release a tremendous amount of water and debris downstream, causing flash floods.
Urbanization and Poor Drainage: In urban areas, the vast expanse of impermeable surfaces like roads and buildings can lead to rapid runoff during heavy rains. Inadequate drainage systems can exacerbate this problem, contributing to flash floods in urban environments.
Sudden Onset Weather Events: Weather events like cloudbursts, thunderstorms, or tropical cyclones can produce intense, localized rainfall in a short duration, overwhelming the natural drainage systems and leading to flash floods.
Terrain and Topography: The geography of an area, such as steep slopes, narrow canyons, or natural funneling of water, can increase the likelihood of flash floods by accelerating the flow of water downstream.
Flash floods are particularly dangerous because they occur suddenly and can quickly inundate areas, leaving little time for preparation or evacuation. Understanding the factors that contribute to flash floods is crucial for predicting and mitigating their impact in vulnerable regions.
