Pa Sak River

Infobox River
river_name = Pa Sak River

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caption = Map of the Chao Phraya River drainage basin showing the Pa Sak River
origin = Dan Sai District, Loei Province
mouth = Chao Phraya River at Ayutthaya Island
basin_countries = Thailand
length = 513 km (308 mi)
elevation =
discharge = 2.4 km³/yr
watershed = 16,291 km²

The Pa Sak River ( _th. แม่น้ำป่าสัก) is a river in central Thailand. The river originates in Dan Sai District, Loei Province, passes through Phetchabun Province as the backbone of the Province. It then passes through the eastern part of Lopburi Province and Saraburi Province, until it joins together with the Lopburi River at the northeast of the Ayutthaya Island, before it runs into the Chao Phraya River in the southeast of Ayutthaya island around Phet Fortress area. It has a length of 513 km and drains a watershed of 16,291 km². The annual discharge is 2.4 km³.

The valley of the Pa Sak through the Phetchabun mountains is the main part of Phetchabun Province. As the watershed of the river is rather narrow, the amount of water in the river changes a lot seasonally. To level the drought problems in the lower Pa Sak valley, in 1994 the construction of the Pasak Jolasit Dam (เขื่อนป่าสักชลสิทธิ์) in the Lopburi Province was started. The 4,860 meters wide and 31.5 m high dam keeps a total of 0.785 km³ of water. Additionally to the water management the dam also supplies about 6.7 MW of hydro-electric power.

Tributaries

Tributaries of the Pa Sak include the Lopburi, Muak Lek, Phung, Pa Daeng, Kong, Sonthi, Wang Chomphu, Na, Chun, Duk, Khon Kaen, Yai, Saduang Yai, Ban Bong, Tarang and Phaya Klang Rivers.

Pa Sak Basin

The Pa Sak drains a total land area of 16,291 square kilometers. [http://en.pwa.co.th/l_basins.htm Basins of Thailand] ] This "Pa Sak Basin" is part of the Chao Phraya Watershed.

References

External links

* [http://www.chaipat.or.th/chaipat/journal/apr98/eng/pasak.html The Pasak Jolasit Dam project]