What is the history of floods in Bihar and why is it prone to floods?

A few of us did an exercise where we closed our eyes and thought of the first four words that came to our minds when we thought of water data in India. Here is what we came up with:

India is fortunate to have a rich tradition of public data collection and compilation.

Water quality of Ganga river remained grim during lockdown: CPCB

A quick search for the word data on India Water Portal results in a flood of queries - people are looking for water data - for specific villages, cities or for the entire country. 

Jalyukt Shivar Abhiyan had a low impact in making Maharashtra drought free: CAG

Punjab no.1 in overexploitation of groundwater 

Harpur Bochha is a village in Vidyapatinagar block of Samastipur district of Bihar. The village, which has a population of about 11.5 thousand people and  2349 houses, remained inundated with rain and floodwater throughout the year followed by waterlogging.

Friedrich Nietzsche famously wrote that he who has a ‘why’ to live can bear almost any ‘how'. A strong reason, motivation (why) and curiosity lead to actions that pave the path (how) to achieve any desired goal.

Since last week, people of Birjain village have been protesting against erosion by the river bank. They are demanding that the government should put in efforts to prevent river erosion and save their houses, otherwise they will continue with their Satyagrah and perform Jal Samadhi (suicide by drowning). Sattore, a flood-prone Panchayat has about 3000 houses.