Nepal flash flood raises concern in Bihar as Gandak level comes under watch

A devastating flash flood in Nepalrsquos Rasuwa district has prompted heightened vigilance in Bihar as authorities monitor the Gandak River and vulnerable areas along its course The two regions are connected through a network of rivers that eventually carries water from Tibet into BiharFloodwaters flow through interconnected river systemThe flash flood struck Nepal around 9 am on Wednesday causing extensive damage in Timure Syaphrubesi and Rasuwagadhi Roads bridges and other infrastructure were washed away while several people were reported missingAccording to Nepali authorities the sudden rise in water originated in Tibet Preliminary assessments indicate that an obstruction formed by glacial debris may have suddenly given way triggering the surgeThe river system broadly runs from Tibet through the Bhote Koshi Trishuli and Narayani before the river enters India where it is known as the Gandak The Gandak eventually joins the GangaBihar authorities monitoring GandakThe developments in Nepal have led to increased monitoring of the Gandak in Bihar However officials cautioned that flooding in Nepal does not automatically mean Bihar will face an immediate flood threatThe impact in Bihar will depend on the volume of water travelling downstream rainfall additional inflows from other rivers and how barrages regulate the flowThe Gandak enters Bihar through Valmikinagar in West Champaran making the Valmikinagar Barrage a crucial point for monitoring and regulating the riverSeveral districts kept under watchWest Champaran is among the key districts being monitored particularly areas around Valmikinagar and the Gandak basinIn East Champaran lowlying and riverside areas could face increased risks of flooding and erosion if water levels rise Gopalganj which borders the Champaran districts could also face a flood threat in case of a sudden increase in Gandak dischargeLowlying areas connected to the Gandak system in Siwan are also being monitoredParts of western Muzaffarpur could experience waterlogging or erosion if the river rises substantially The Gandak then passes through Saran making areas around Chhapra important from a monitoring perspectiveThe river ultimately joins the Ganga near the SonepurHajipur region bringing riverside areas in Saran and Vaishali under observationOfficials say immediate flood threat prematureOfficials said the intensity of any flood wave could change as it moves downstream because of river capacity distance additional inflows and other hydrological factorsThe Valmikinagar Barrage therefore remains a critical point for tracking and managing the flow entering BiharFor now officials said it would be premature to describe the Nepal flash flood as an immediate flood threat to Bihar However given the direct river connection authorities are maintaining heightened vigilance along the Gandaks banks and in vulnerable lowlying areasWith inputs from IANS