Kosi River The Sorrow of Bihar
The Kosi River ( कोसी नदी) is one of the largest tributaries of the Ganga
River . Kosi river is called Koshi in Nepal and is a Tran boundary river between
Nepal and India. The river basin is surrounded by the ridges separating it from
the Brahmaputra in the north, the Gandaki in the west, the Mahananda in the
east, and by the Ganga in the south. Kamlā, Bāghmati (Kareh) and Budhi Gandak
are major tributaries of Koshi in India, besides minor tributaries like Bhutahi
Balān. Over the last 250 years, the Kosi River has shifted its course over 120
kilometres from east to west. The Kosi River (The Sorrow of Bihar) is one of two
major tributaries, the other river being Gandak, draining the plains of north
Bihar, the most flood-prone area of India. This river is mentioned in the epic
Mahabharata as Kauśiki.
The Kosi river has seven major tributaries. These tributaries encircle Mt
Everest from all sides and are fed by the world's highest glaciers. After
descends from the mountains they merge and called simply the Koshi. After
flowing 58 km in Nepal, it enters the north Bihar plains near Bhimnagar and
after another 260 km , flows into the Ganges near Kursela. The river travels a
distance of 729 km from its source to the confluence with the Ganga.
The Kosi river fan located in northeast Bihar and eastern Mithila is 180 km long
and 150 km -wide alluvial cone shows evidence of lateral channel shifting
exceeding 120 km during the past 250 years through more than 12 distinct
channels. The river, which used to flow near Purnea in the 18th century, now
flows west of Saharsa.
Two famous national parks are located in the Koshi river basin: the Sagarmatha
National Park, in eastern Nepal and the Koshi Tappu Wildlife Reserve situated in
Eastern Nepal. Sagarmatha National park is located in eastern Nepal is also
included as a UNESCO world heritage site, was created on July 19, 1976.
The Kosi is known as the â€œSorrow of Biharâ€ when it flows from Nepal to India, as
it has caused widespread human suffering in the past through flooding and very
frequent changes in course. The Kosi Barrage has been designed for a peak flood
of 27,014 mÂ³/s
Kosi Barrage, also called Bhimnagar Barrage after the name of the place where it
was built between the years 1959 and 1963 straddles the Indo-Nepal border. It is
an irrigation, flood control and hydropower generation project on the Kosi river
built under a bilateral agreement between Nepal and India: the entire cost of
the project was borne by India. The catchment area of the river is 61,788 sq.km
in Nepal at the Barrage site.
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