Ayase River

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Ayase River
Ayasegawa Soka city 2.JPG
Ayase River in Sōka, Saitama, Japan
Ayase River
Location
Country Japan
Region Kantō
Physical characteristics
Source 
  location Okegawa
Mouth Naka River
  location
Katsushika
  coordinates
35°43′22″N139°50′33″E / 35.7229°N 139.8425°E / 35.7229; 139.8425
Length47 km (29 mi)
Basin size178 km2 (69 sq mi) [1]
Discharge 
  location Okegawa, Saitama
Basin features
River system Ara river basin

The Ayase River (綾瀬川, Ayase-gawa) is a river in Japan.

Contents

Geography

The Ayase River, takes its source in the city of Okegawa in Saitama Prefecture then joins the Naka River in Katsushika, Tokyo. The latter flows into the river Arakawa River, 2 km (1.2 mi) before Tokyo Bay.

Development

The course of the river was developed in Edo period (1603-1868), when Edo (old name of Tokyo) became the shogunal capital of Japan. [2] Historically, the first part of the river is used for irrigation and agriculture, the middle and the end for the supply of water to the population of Tokyo and for river transport (the Ayase river notably allows the connection between the Arakawa and Tone). [1]

The river caused several major floods. [3]

Pollution

From the 1960s to the 1990s, the river was the most polluted in Japan, occupying twenty-five times the head of the classification of the most polluted rivers between 1972 and 2007. The pollution, which was caused by agricultural and industrial activities and the density of the population in close proximity to the riverbanks, led to cleanup projects in the late 1990s and during the 2000s. [1]

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The Iwaki River is a river that crosses western Aomori Prefecture, Japan. It is 102 kilometers (63 mi) in length and has a drainage area of 2,544 square kilometers (982 sq mi). Under the Rivers Act of 1964 the Iwaki is designated as a Class 1 River and is managed by the Japanese Ministry of Land, Infrastructure, Transport and Tourism. The Iwaki River is the longest river in Aomori Prefecture, and is the source of irrigation for the large-scale rice and apple production of the prefecture. The Iwaki River, in the Tōhoku region north of the Fukushima Daiichi Nuclear Power Plant, remains unpolluted by radioactive materials after the Fukushima Daiichi nuclear disaster. Testing for caesium-134 and caesium-137 is carried out and published on a bimonthly basis.

References

  1. 1 2 3 Oishi, Masao; Ikushima, Yoshimi (2008). "The Most Polluted River in Japan: Ayasegawa River ~Campaign Breaking the Worst One~" (PDF).
  2. (in Japanese) "綾瀬川の歴史・文化 (Histoire d'Ayase)". 江戸川河川事務所 (Office de la rivière Edo-gawa). Retrieved 13 March 2013.
  3. (in Japanese) "中川・綾瀬川の主な災害 (Principaux désastres de l'Ayase-gawa et de la Naka-gawa)". Ministry of Land, Infrastructure, Transport and Tourism. Archived from the original on 27 January 2013. Retrieved 13 March 2013.