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Najafgarh drain
・ Najafgarh drain bird sanctuary
・ Najafgarh Lake
・ Najafgarh Stadium
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・ Najafi, Iran
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Najafgarh drain : ウィキペディア英語版
Najafgarh drain

The Najafgarh drain or Najafgarh nallah (''nallah'' in Hindi means rivulet or storm water drain) is another name for the River Sahibi, which continues its flow through Delhi, where it is channelized, and then flows into the Yamuna. Within Delhi, due to its channelization for flood control purposes, it is now erroneously called "Najafgarh drain" or "Najafgarh nallah." It gets this name from the once famous and huge Najafgarh Jheel (lake) near the town of Najafgarh in southwest Delhi and within urbanized Delhi. It is the Indian capital’s most polluted water body due to direct inflow of untreated sewage from surrounding populated areas. A January 2005 report by the Central Pollution Control Board classifies this drain, with 13 other highly polluted wetlands, under category ‘‘D’’ for assessing the water quality of wetlands in wildlife habitats.〔(Blot across the Capital: Najafgarh most polluted ), Sunday, 10 July 2005, The Indian Express〕〔(Environment minister raises a stink over Najafgarh jheel ), 22 February 2005, The Indian Express〕〔(Najafgarh basin Delhi’s most polluted area ), 25 Dec 2009, The Indian Express〕〔(Najafgarh drain 11th among highly polluted industrial clusters ), 25 Dec 2009, The Times of India〕〔(Najafgarh drain causes less pollution in Yamuna now ), 4 July 2006, The Indian Express〕
This drain was widened as a flood control drain linking the Najafgarh Jheel or lake to the river Yamuna, thus completely draining the once huge and ecologically rich Najafgarh Lake, famous for its wetland ecosystem, waterbirds and wildlife.
==Classification and naming==

Within the National Capital Territory of Delhi (NCT), this channelized waterway—misclassified, misnamed as a mere drain (''Najafgarh drain or nallah'')--is, in fact, the continuation of the Sahibi River and an elongation of the Najafgarh jheel Lake. During the 1960s and before, the rain-fed Sahibi River, which originates in the Jaipur District of Rajasthan, passing through Alwar District in Rajasthan and Gurgaon District in Haryana, entered U.T. of Delhi near Dhansa and spilled its overflow in the Najafgarh Jheel (lake) basin. This overflow created a seasonal lake; an area of more than was submerged in some seasons. This water then continued to flow on the other side, forming a tributary of the River Yamuna. In the following decades, this Sahibi River flow reaching the Dhansa regulators was channelized by digging out a wide drain and connecting it directly to the River Yamuna. This channelization also completely drained off the seasonal Najafgarh Jheel that had formed there previously. The channelized drain from Dhansa regulators to Keshopur Bus Depot on Outer Ring Road is wide with thick and high embankments. A vast amount of water is retained in this widened drain by closing the Kakrola regulators under Najafgarh Road to recharge the local ground watertable; hence it acts like an elongated lake as well.〔(Flood Problem due to Sahibi River ), Department of Irrigation and Flood Control, Government of NCT of Delhi, India. Website Last Updated : 3 May 2010, (A sewage drain is now called the Yamuna ), By Sonu Jain, 27 Mar 1999, Indian Express, ( CRUSADE: Killing Delhi’s Lifeline ), Charu Soni, 19 Aug 2006, New Delhi. Tehelka, (Riversutra gone all wrong ), By Sunita Narain, 5 Jun 2012, Times of India, (‘Better management in Haryana may solve Delhi’s water problems’ ), New Delhi, 22 Mar 2012, DHNS, Deccan herald, (Sunita Narain bats for sustainable development ), Express News Service : Pune, Tue 28 Feb 2012, The Indian Express〕

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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