Shiba River

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The Shiba River(芝川,Shiba-kawa) is a tributary of the Arakawa River that mainly runs through the eastern part of Saitama Prefecture. The river has Suehiro(末広) and Kobari-ryōke(小針領家) in Okegawa, Saitama as points of origin and flows through Ageo, Minuma and Kawaguchi, and connects to the Arakawa River.

Okegawa, Saitama City in Kantō, Japan

Okegawa is a city located in Saitama Prefecture, Japan. As of 1 February 2016, the city had an estimated population of 74,000, and a population density of 2920 persons per km². Its total area is 25.35 km².

Ageo, Saitama City in Kantō, Japan

Ageo is a city located in Saitama Prefecture, Japan. As of 1 February 2016, the city had an estimated population of 224,841, and a population density of 4940 persons per km². Its total area is 45.51 square kilometres (17.57 sq mi).

Minuma

Minuma or Minuma Rice Paddies is an area of paddy fields and other agricultural fields along the Minuma Irrigational Canal in Saitama Prefecture, Japan. The area encompasses 1260 hectares and straddles across five wards of the city of Saitama. Despite its close proximity to major urban areas such as Saitama-Shintoshin Station and Ōmiya Station, idyllic scenery consisting of paddy fields, farmlands, forests and rivers still remains.

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History

Originally, the river flowed into a wetland at the current region of Minuma. In 1629, a civil engineering project by Ina Tadaharu(伊奈 忠治) created a reservoir and blocked the flow. In 1727, the reservoir levee was demolished to open up the area for creating rice paddies. In 1728, the lowest sections of the area were gouged to allow for the passage of water, which set the current position of the river.

Water quality

The water quality of the river is poor, since it flows through urban areas. A report published in 2006 by the Ministry of the Environment indicates levels of dioxins and dioxin-like compounds above the standards set for public waterways. For this reason, recent years saw efforts to clear up the river.

Ministry of the Environment (Japan) ministry of Japan

The Ministry of the Environment is a Cabinet-level ministry of the government of Japan responsible for global environmental conservation, pollution control, and nature conservation. The ministry was formed in 2001 from the sub-cabinet level Environmental Agency established in 1971. The Minister of the Environment is a member of the Cabinet of Japan and is chosen by the Prime Minister, usually from among members of the Diet.

Dioxins and dioxin-like compounds class of chemical compounds

Dioxins and dioxin-like compounds (DLCs) are compounds that are highly toxic environmental persistent organic pollutants (POPs). They are mostly by-products of various industrial processes - or, in case of dioxin-like PCBs and PBBs, part of intentionally produced mixtures. They include:

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Arakawa River (Kantō) river flowing through Kantō region, Japan.

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