Flood Situation Near Gandak River: Embankment Breaches and Water Level Analysis in Bihar

The flood situation near gandak river reached a critical peak in late September 2026, driven by heavy rainfall in Nepal's catchment areas. This triggered a record discharge of 5.43 lakh cusecs from the Valmikinagar barrage on September 28, 2026, leading to widespread inundation across Bihar's border districts [1].

The crisis was compounded by the Ganga river flowing above the danger mark. This created "backflow pressure" in the Gandak, which hindered the river's ability to drain and intensified the flooding in low-lying residential and agricultural zones [2].

Major Embankment Breaches and Regional Impact

Between September 28 and September 30, 2026, several embankments failed, causing panic and displacement. While the east champaran floods were noted, the most severe breaches were concentrated in West Champaran and adjacent districts.

• West Champaran: Three breaches occurred between September 28 and 29 at Kharatwa Daroga Chowk, Phulia Khad village, and Makari Tesarahiya. These failures flooded Bagaha town and several villages, including Chakhani and Bargaon [1].
• Saran and Muzaffarpur: A breach was reported in the right embankment of the Panapur block (Saran) on September 30, and a ring embankment of the Tirhut Main Embankment in the Sahebganj block (Muzaffarpur) also failed [2].
• Other Areas: Reports indicated breaches at Pandey Tola (East Champaran), Baikunthpur (Gopalganj), and Maker (Saran) in the early hours of September 30 [1].

Water Level Data and Current Trends

As of October 1, 2026, the Water Resources Department (WRD) reported that the Gandak had exceeded its previous Highest Flood Level (HFL) at several critical monitoring stations [2].

Monitoring Station	Status (as of Oct 1, 2026)	Observation
Dumariaghat (Gopalganj)	Above HFL	~22 cm above HFL for nearly 36 hours
Revaghat (Saran)	Above HFL	~22 cm above HFL for nearly 21 hours
Lalganj (Vaishali)	Above HFL	~22 cm above HFL for nearly 21 hours
Valmikinagar Barrage	Receding	95,340 cusecs (8 am, Oct 1)

Emergency Response and Recovery

Bihar Chief Minister Samrat Choudhary conducted aerial surveys of the affected areas, specifically West Champaran, to coordinate rescue efforts. The state deployed NDRF and SDRF companies to the region, and 23 community kitchens were established in West Champaran to provide food to displaced families [1].

While water levels began showing a declining trend by October 1-2, the WRD warned that hydraulic pressure on the embankments was expected to persist for 48 hours after October 1, requiring continued round-the-clock monitoring to prevent further seepage or piping [2].