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River Yamuna : ウィキペディア英語版
Yamuna


The Yamuna (/jəmʊnaː/; Sanskrit and Hindi: यमुना), sometimes called Jamuna (Hindi: जमुना; /d͡ʒəmʊna:/) is the longest and the second largest tributary river of the Ganges (Ganga) in northern India. Originating from the Yamunotri Glacier at a height of 6,387 metres on the south western slopes of Banderpooch peaks in the uppermost region of the Lower Himalayas in Uttarakhand, it travels a total length of and has a drainage system of , 40.2% of the entire Ganges Basin, before merging with the Ganges at Triveni Sangam, Allahabad, the site for the Kumbha Mela every twelve years.
It crosses several states, Uttarakhand, Haryana and Uttar Pradesh, passing by Uttarakhand and later Delhi, and meets its tributaries on the way, including Tons, its largest and longest tributary in Uttarakhand, Chambal, which has its own large basin, followed by Sindh, the Betwa, and Ken. Most importantly it creates the highly fertile alluvial, Yamuna-Ganges Doab region between itself and the Ganges in the Indo-Gangetic plain. Nearly 57 million people depend on the Yamuna waters. With an annual flow of about 10,000 cubic billion metres (cbm) and usage of 4,400 cbm (of which irrigation constitutes 96 per cent), the river accounts for more than 70 per cent of Delhi’s water supplies. Just like the Ganges, the Yamuna too is highly venerated in Hinduism and worshipped as goddess Yamuna, throughout its course. In Hindu mythology, she is the daughter of Sun God, Surya, and sister of Yama, the God of Death, hence also known as Yami and according to popular legends, bathing in its sacred waters frees one from the torments of death.
The water of Yamuna is of "reasonably good quality" through its length from Yamunotri in the Himalayas to Wazirabad in Delhi, about , where the discharge of waste water through 15 drains between Wazirabad barrage and Okhla barrage renders the river severely polluted after Wazirabad. One official describes the river as a "sewage drain" with biochemical oxygen demand (BOD) values ranging from 14 to 28 mg/l and high coliform content. There are three main sources of pollution in the river, namely households and municipal disposal sites, soil erosion resulting from deforestation occurring to make way for agriculture along with resulting chemical wash-off from fertilizers, herbicides, and pesticides and run-off from commercial activity and industrial sites.
==Course==

The source of Yamuna lies in the Yamunotri Glacier at an elevation of , on the south western slopes of Banderpooch peaks, which lie in the Mussoorie range of Lower Himalayas, in the Uttarkashi district, Uttarakhand, north of Haridwar.〔 Yamunotri temple, a shrine dedicated to the goddess, Yamuna is one of the holiest shrines in Hinduism, and part of the Chota Char Dham Yatra circuit. Also standing close to the temple, on its trek route, that follows the right bank of the river, lies the ''Markendeya Tirtha'', where the sage Markandeya wrote the Markandeya Purana.〔(Yamunotri Temple ) Uttarkashi district website.〕
From here it flows southwards, for about through the Lower Himalayas and the Shivalik Hills Range and morainic deposited are found in its steep Upper Yamuna village, highlighted with geomorphic features such as interlocking spurs, steep rock benches, gorges and stream terraces. Large terraces formed over a long period of time can be seen in the lower course of the river, like ones near Naugoan. An important part of its early catchment area totalling lies in Himachal Pradesh, and an important tributary draining the Upper Catchment Area is the Tons, Yamuna's largest tributary, which rises from the Hari-ki-dun valley and holds water more than the main stream, which it merges after Kalsi near Dehradun. The entire drainage system of the river stretches all the way between Giri-Sutlej catchment in Himachal and Yamuna-Bhilangna catchment in Garhwal, indeed the southern ridge of Shimla is also drained into this system. Kalanag () is the highest point of the entire Yamuna basin.
Other tributaries in the region are the Giri, Rishi Ganga, Kunta, Hanuman Ganga and Bata tributaries, which drain the Upper Catchment Area of the vast Yamuna basin.〔(General outline of rivers in Himachal @ webindia123 )〕 Thereafter the river descends on to the plains of Doon Valley, at Dak Pathar near Dehradun. Here through the Dakpathar Barrage, the water is diverted into a canal for power generation, little further down where Yamuna is met by the Assan River, lies the Asan Barrage, which hosts a Bird Sanctuary as well. After passing the Sikh pilgrimage town of Paonta Sahib, it reaches Tajewala in Yamuna Nagar district (named after the river itself), of Haryana, where a dam built in 1873, is the originating place of two important canals, the Western Yamuna Canal and Eastern Yamuna Canal, which irrigate the states of Haryana and Uttar Pradesh. The Western Yamuna Canal (WYC) crosses Yamuna Nagar, Karnal and Panipat before reaching the Haiderpur treatment plant, which supplies part of municipal water supply to Delhi, further it also receives waste water from Yamuna Nagar and Panipat cities. Yamuna is replenished again after this by seasonal streams and groundwater accrual, in fact during the dry season, it remains dry in many stretches from Tajewala till Delhi, where it enters near Palla village after traversing .
The Yamuna also creates natural state borders between the Himachal Pradesh and Uttarakhand states, and further down between the state of Haryana, Delhi and Uttar Pradesh. Along with the Ganges to which run almost parallel after it touches the Indo-Gangetic plain, the largest alluvial fertile plain in the world, it creates the Ganges-Yamuna Doab region spread across , one-third of the entire plain, and today known for its agricultural outputs, prominent among them is the cultivation of Basmati Rice. The plain itself supports one-third of India's population through its farming.
Subsequently, it flows through the states of Delhi, Haryana and Uttar Pradesh] before merging with the Ganges at a sacred spot known as Triveni Sangam in Allahabad after traversing a distance of . Here pilgrims travel by boats to platforms erected mid stream to offer prayers. During the Kumbh Mela, held every 12 years, the ghats around the Sangam are venue of large congregation of people, who take dip in the sacred waters of the confluence.〔(At the Three Rivers ) ''TIME'', February 23, 1948.〕 The cities of Baghpat, Delhi, Noida, Mathura, Agra, Firozabad, Etawah, Kalpi, Hamirpur, Allahabad lie on its banks. At Etawah, it meets it another important tributary, Chambal, followed by a host of tributaries further down, including, Sindh, the Betwa, and Ken.〔〔(State of River Yamuna )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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