Shiba River
Encyclopedia
The is a tributary of the Arakawa River
Arakawa River
The is one of the principal rivers flowing through Tokyo, the capital city of Japan. The point of origin is on Mount Kobushi in Saitama Prefecture, and the Arakawa River empties into Tokyo Bay, spanning 173 kilometers. The drainage basin covers 2,940 square kilometers...

 that mainly runs through the eastern part of Saitama Prefecture. The river has and in Okegawa, Saitama
Okegawa, Saitama
is a city located in Saitama, Japan. It was founded on November 3, 1970, and as of 2003, the city has an estimated population of 73,881 and the density of 2,924.82 persons per km²...

 as points of origin and flows through Ageo
Ageo, Saitama
is a city located in Saitama, Japan.As of December 1, 2010, the city has an estimated population of 227,127 and the density of 4,986.32 persons per km². The total area is 45.55 km². It is twinned with Ueda, Nagano.- History :...

, Minuma
Minuma
or is an area of paddy fields and other agricultural fields along the Minuma Irrigational Canal. The area encompasses 1260 hectares and straddles across five wards of the city of Saitama...

 and Kawaguchi
Kawaguchi, Saitama
is a city located in Saitama Prefecture, Japan. The city was founded on April 1, 1933.As of January 1, 2011, the city has an estimated population of 517,171, the second largest in Saitama Prefecture after Saitama, and a population density of 9,276.61 persons per km². The total area is 55.75 km²...

, and connects to the Arakawa River
Arakawa River
The is one of the principal rivers flowing through Tokyo, the capital city of Japan. The point of origin is on Mount Kobushi in Saitama Prefecture, and the Arakawa River empties into Tokyo Bay, spanning 173 kilometers. The drainage basin covers 2,940 square kilometers...

.

History

Originally, the river flew into a wetland at the current region of Minuma
Minuma
or is an area of paddy fields and other agricultural fields along the Minuma Irrigational Canal. The area encompasses 1260 hectares and straddles across five wards of the city of Saitama...

. In 1629, a civil engineering project by 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 Dioxin above the standards set for public waterways. For this reason, recent years saw efforts to clear up the river.
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