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(2 basin, basin is international, all 795 000 square kilometers. But the basin portion of Thai, only 57 422 square km.A watershed in the north and northeast. In the north, covering an area of 2 provinces, Phayao and Chiang Rai in the northeast, covering an area of 7 provinces. Nong Khai in Sakon Nakhon.And Ubon Ratchathani. This basin is divided into 38 River Branch The population density 104 people.Km rainfall, average 1 537 mm / year. At present, there are water demand, all 4 456 MCM./ year, which also have water shortage, but not numbers clearly. And from the needs assessment of water in the future, it was found that long term up to a year 2549 water shortage will increase, 1 093 million cubic meters / year.
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