A Memorandum of Understanding (MoU) was signed between the two neighbors in 2002 for the sharing of hydrological information on the Yarlung Zangbu (Siang) during the flood season by China for three stations on the river, on the level of water, precipitation and flow. The agreement was renewed in 2008, 2013 and in 2018 for a further period of five years.
Another memorandum of understanding on the Siang was signed in 2013, which increased the originally planned data duration between June 1 and October 15 to between May 15 and October 15.
In 2005, a similar agreement was signed for the Sutlej River (Langqen Zangbo), which was renewed in 2010 and 2015.
The signing of the Memorandum of Understanding on the Brahmaputra and Sutlej Rivers with China was followed by implementation plans outlining the modalities regarding technical details on hydrological information, data transmission method, cost settlement, etc. . These plans also provided details of the stations, frequency, type, duration and data transmission format to be provided.
Following the visit of then Chinese President Hu Jintao to India in 2006, an Expert Level Mechanism (ELM) was established to discuss cooperation on hydrological data sharing during the flood season, emergency management and other issues on the two transboundary rivers. ELM meetings are held annually and alternately in India and China.