カル ガンガ (කළු ගඟ)
カル ガンガ (シンハラ語: කළු ගඟ; 直訳: 黒い川) は、スリランカの川です。長さ 129 km (80 マイル) のこの川は、スリ パダヤから始まり、カルタラの海に達します。ブラック川はラトナプラとカルタラ地区を流れ、ラトナプラ市を通過します。中部州の山林とシンハラジャ森林保護区がこの川の主な水源です。
カル ガンガ川流域は、降雨量が非常に多く、流量も多いスリランカで最も重要な河川流域の 1 つです。その水文学的および地形的特徴により、下流氾濫原は頻繁に洪水に見舞われ、社会経済的側面に大きな影響を与えています。過去数年間、多くの研究者が国内の主要河川流域の気候変動を調査してきましたが、カルガンガ流域の気候変動については研究が行われていませんでした。したがって、この研究の目的は、カルガンガ盆地における降水傾向を調査することでした。年間および毎月の降水量の傾向は、Mann-Kendall 統計検定によって検出されました。年間降水量のマイナス傾向は、分析されたすべての雨量観測所で見つかりました。平均すると、年間降雨量が 12.03 mm/年減少し、-0.98 の傾向が見られました。 4月と8月には強い減少傾向が観察されました。 7 月と11 月は強い増加傾向を示しました。結論として、カルガンガ盆地全体の年間降水量は減少傾向にあり、わずかな気候の変化が調査地域内の降水量と降水量のタイミングに影響を与えた可能性があることは明らかです。
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Malwathu Oya (මල්වතු ඔය)The Malvathu River long river in Sri Lanka, connecting the city of Anuradhapura, which was the capital of the country for over 15 centuries, to the coast of Mannar. It currently ranks as the second longest river in the country, with a great historic significance.
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Kelani River (කැලණි ගඟ)The Kelani River is a 145-kilometre-long (90 mi) river in Sri Lanka. Ranking as the fourth-longest river in the country, it stretches from the Sri Pada Mountain Range to Colombo. It flows through or borders the Sri Lankan districts of Nuwara Eliya, Ratnapura, Kegalle, Gampaha and Colombo.
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Yan Oya (යාන් ඔය)The Yan Oya is the fifth-longest river of Sri Lanka. It measures approximately 142 km (88 mi) in length. Its catchment area receives approximately 2,371 million cubic metres of rain per year, and approximately 17 percent of the water reaches the sea. It has a catchment area of 1,520 square kilometres.
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Walawe River (වලවේ ගඟ)The southern region of Sri Lanka is exalted by a bushel of enthralling and glorified rivers and the Walawe River is one of them. Gently flowing through the Udawalawe National Park, the Walawe River provides water for a multitude of species of mesmerising fauna.
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Kalu Ganga (කළු ගඟ)Kalu Ganga is a river in Sri Lanka. Measuring 129 km (80 mi) in length, the river originates from Sri Padhaya and reach the sea at Kalutara. The Black River flows through the Ratnapura and the Kalutara District and pass the city Ratnapura. The mountainous forests in the Central Province and the Sinharaja Forest Reserve are the main sources of water for the river.
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Maha Oya (මහ ඔය)The Maha Oya is a major stream in the Sabaragamuwa Province of Sri Lanka. It measures approximately 134 km (83 mi) in length. It runs across four provinces and five districts. Maha Oya has 14 Water supply networks to serve the need of water and more than 1 million people live by the river.
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Gin Ganga (ගිං ගඟ)The Gin Ganga, is a 115.9 km (72 mi) long river situated in Galle District of Sri Lanka. The river's headwaters are located in the Gongala Mountain range, near Deniyaya, bordering the Sinharaja Forest Reserve.
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Kala Oya (කලා ඔය)It was around these ancient tank (water storage reservoir) irrigation systems that the economy and human settlements of early Sri Lankan society were organised into a “hydraulic civilization”.
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Deduru Oya (දැදුරු ඔය)The Deduru Oya Dam is an embankment dam built across the Deduru River in Kurunegala District of Sri Lanka. Built in 2014, the primary purpose of the dam is to retain approximately a billion cubic metres of water for irrigation purposes, which would otherwise flow out to sea.
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Maduru Oya (මාදුරු ඔය)The Maduru Oya is a major stream in the North Central Province of Sri Lanka. It is approximately 135 km (84 mi) in length. Its catchment area receives approximately 3,060 million cubic metres of rain per year, and approximately 26 percent of the water reaches the sea.
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Kumbukkan Oya (කුඹුක්කන් ඔය)The Kumbukkan Oya is the twelfth-longest river of Sri Lanka. It is approximately 116 km (72 mi) long. It runs across two provinces and two districts. Its catchment area receives approximately 2,115 million cubic metres of rain per year, and approximately 12 percent of the water reaches the sea.
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Mi Oya (මී ඔය)The Mi oya is a 108 km (67 mi) long river, in North Western of Sri Lanka. It is the fifteenth-longest river in Sri Lanka. It begins in Saliyagama and flows northwest, emptying into the Indian Ocean thru Puttalam.
