The 1987 Bihar flood Catastrophe , caused Causation by high levels of annual flooding Catastrophe of the Kosi River ( nicknamed Name_conferral `` the sorrow of Bihar '' ) , was one of the worst floods Catastrophe in Bihar , India , in a decade caused by a landslide that blocked Hindering the main route of Bhote Kosi River .

The 1987 Bihar flood Catastrophe , caused Causation by high levels of annual flooding Catastrophe of the Kosi River ( nicknamed Name_conferral `` the sorrow of Bihar '' ) , was one of the worst floods Catastrophe in Bihar , India , in a decade caused by a landslide that blocked Hindering the main route of Bhote Kosi River .

The Kosi River is to blame for this as it has a problematic history of flooding and changing its direction .