Study area is MAE CHAN watershed in CHIANG RAI province.
Approximately area is 1,196 square kilometers. It is located in some parts of King
Amphoe MAE FA LUANG, Amphoe MAE CHAN, and Amphoe MUANG. The two
main rivers are MAE CHAN river and NAM KHAM river. Watershed feature is
parallel basin that could be divided into 2 parts and met at the end or bottom of river.
The flood risk may be occurred at the end of river.