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Tha Chin Basin (the basin of the Chao Phraya's most significant distributaries) Finally the Chao Phraya Basin itself is defined as the portion of the Chao Phraya watershed drained by the Chao Phraya River itself, and not by its major tributaries or distributaries. As such, the Chao Phraya Basin drains 20,126 square kilometres (7,771 sq mi) of land.
The Ping Basin is one of the largest drainage basins of the Chao Phraya Watershed, draining 33,896 square kilometres (13,087 sq mi) of land. The greater Ping Basin, i.e. the basin of the entire Ping river system including its tributary the Wang River , drains a total of 44,688 square kilometres (17,254 sq mi).
Map of the Chao Phraya River drainage basin. The principal tributaries of the Chao Phraya River of Thailand are the Pa Sak River, the Sakae Krang River, the Nan River (along with its principal confluent the Yom River), the Ping River (with its principal confluent the Wang River), and the Tha Chin River. [1]
Chao Phraya River System. Thw Chao Phraya River in Bangkok. The Chao Phraya River system is the main river system of Thailand, as its basin defines much of the region of central Thailand. The Chao Phraya River begins at the confluence of the Ping and Nan Rivers at Nakhon Sawan (also called Pak Nam Pho) in Nakhon Sawan Province.
The Sirikit Dam among others in the Chao Phraya basin were constructed beginning in the 1950s to exploit the agricultural and hydroelectric potential of the basin. Preliminary construction on the dam began in 1968 and it was finished in 1972. The power plant and first three units were commissioned in 1974, the fourth in 1995. [2]
The Yom river and its tributaries drain a total area of 24,047 square kilometres (9,285 sq mi) of land (called the Yom Basin) in the provinces of Sukhothai, Phitsanulok, Phichit, Phrae, and Lampang. [2] The Yom Basin is part of the Greater Nan Basin and the Chao Phraya Watershed.
Historically, the Noi River Basin is the oldest settlement site of the entire Chao Phraya River Basin, as evidence Mae Nam Noi Kiln Site in Bang Rachan District, Singburi, older than the Ayutthaya period.
It regulates the flow of the Chao Phraya River as it passes into lower central Thailand, distributing water to an area of 11,600 square kilometres (4,500 sq mi) in seventeen provinces as part of the Greater Chao Phraya Irrigation Project. The dam has sixteen 12.5-metre gates. It was built between 1952 and 1957. [1]