The Koshi Basin is the largest river basin of Nepal. It originates from the Tibetan Plateau of China. The Koshi river is also known as the "sorrow of Bihar". Floods from the Koshi river in the past have created havoc in the downstream area of Nepal and India leading to loss of lives and property and causing widespread human suffering. This report provides a preliminary assessment of the impacts of the Koshi flood disaster and rainfall forecasts.