China has alerted India about the rising water in river Tsangpo, called Siang in Arunachal Pradesh and Brahmaputra in Assam, leading to possibility of floods in downstream areas, Arunachal Pradesh MP Ninong Ering said on Thursday. A senior official of the Union Water Resources Ministry said it was an unprecedented situation on the Chinese side where Tsangpo broke a 150-year record with swollen waters and hence China has shared the information with India. Ering said the communication from China came following heavy rains in that country after which Tsangpo was in spate.