Siak
Sungai Siak, Siak rivier
The Siak River as it flows through Pekanbaru
Siak River is located in Sumatra
Siak River
Location of river mouth
Siak River is located in Indonesia
Siak River
Siak River (Indonesia)
Location
CountryIndonesia
ProvinceRiau
Physical characteristics
Source 
 • elevation0 m (0 ft)
MouthMalacca Strait
Length370 km (230 mi)
Basin size10,423 km2 (4,024 sq mi)
Discharge 
 • locationSiak Delta, Malacca Strait
 • average(Period of data: 2009-2013)720 m3/s (25,000 cu ft/s)

The Siak (Sungai Siak) is a river of Riau province, in the east of Sumatra, Indonesia, about 1000 km northwest of the capital Jakarta.[1] Approximately 370 kilometres in length, the Siak is a blackwater river which owes its brown color to dissolved organic matter (DOM) leached from surrounding, heavily disturbed peat soils; it is heavily polluted, notably by the petroleum industry. It flows through the town of Pekanbaru before emptying into the Strait of Malacca.[2]

Geography

The river flows in the central area of Sumatra with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification).[3] The annual average temperature in the area is 23 °C. The warmest month is October, when the average temperature is around 25 °C, and the coldest is January, at 22 °C.[4] The average annual rainfall is 2673 mm. The wettest month is November, with an average of 418 mm rainfall, and the driest is January, with 106 mm rainfall.[5]

See also

References

  1. ^ Sungai Siak at Geonames.org (cc-by); Last updated 2013-06-04; Database dump downloaded 2015-11-27
  2. ^ John William Reed; John William King (1867). The China sea directory, Volume 1, Hydrographic Dept. Hydrographic office, Admiralty. p. 229.
  3. ^ Peel, M C; Finlayson, B L; McMahon, T A (2007). "Updated world map of the Köppen-Geiger climate classification". Hydrology and Earth System Sciences. 11 (5): 1633–1644. Bibcode:2007HESS...11.1633P. doi:10.5194/hess-11-1633-2007. Retrieved 30 January 2016.
  4. ^ "NASA Earth Observations Data Set Index". NASA. 30 January 2016.
  5. ^ "NASA Earth Observations: Rainfall (1 month - TRMM)". NASA/Tropical Rainfall Monitoring Mission. 30 January 2016.
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