The Ganga Plains, particularly the middle and lower reaches, are among the most flood-prone regions in India, affecting states like Uttar Pradesh, Bihar, and West Bengal. Key flood-prone areas include the basins of Himalayan rivers like the Kosi, Gandak, Ghaghara, Bagmati, and Mahananda, which join the Ganga. These rivers carry enormous sediment loads from the Himalayas, leading to frequent course changes and embankment breaches. The flat topography, poor drainage, and heavy monsoon rainfall further exacerbate the flood situation.

Management of floods in the Ganga Plains faces several complex problems:

1. High Sedimentation: Himalayan rivers deposit vast quantities of silt, raising river beds and reducing their carrying capacity, making them prone to overflowing their banks.
2. Embankment Breaches: While embankments are built to contain floods, they often fail due to intense pressure, erosion, or poor maintenance, leading to sudden and devastating inundations.
3. Transboundary Nature: Many major rivers originate in Nepal, making flood control a transboundary issue that requires bilateral cooperation and coordinated management strategies, which are often challenging to implement.
4. High Population Density: The plains are densely populated, meaning floods cause immense loss of life, property, crops, and infrastructure, leading to widespread displacement and economic disruption.
5. Lack of Integrated Approach: Fragmented planning, inadequate early warning systems, and insufficient disaster preparedness mechanisms hinder effective flood management. Climate change, with its potential for more intense rainfall events, further complicates these challenges, demanding more resilient and integrated solutions.