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The Kandagawa stretches 24.6 km from Inokashira Park in Mitaka to the Sumida River under the Ryōgoku Bridge at the boundary of Taitō, Chūō, and Sumida. Its entire length lies within Tokyo, Japan. It drains an area of 105.0 km². The government of Japan classifies it as a Class A river.
In the middle section of the length of the river, there is a 2.1 km section from the area near Toden Arakawa Line Waseda Station to near Iidabashi Station which was formerly called Edogawa. The name of this section was changed to Kanda River in August 1970, consistent with the name of the rest of the river. Most other nearby place names nearby deriving from "Edogawa" had disappeared by 1966, but some remain, including Edogawabashi Station, the bridge after which the station was named, and Edogawa kōen in Bunkyo, Tokyo. Additionally, until the late Meiji period, the banks of the river between Ishikiribashi and Ryūkeibashi were considered to be one of the best cherry blossom sites in Tokyo.
Construction began in the 1980s of a diversion tunnel which could temporarily store excess water which historically has been a big problem causing flooding to thousands of homes during powerful typhoons or torrential downpours. The Kanda River Underground Diversion Channel is actually one huge tunnel built under major roads. The plan is to construct a 4.5-km tunnel, 13 m wide tunnel 40 meters below street level. The first 2 km section was completed in 1997, and it can hold the runoff of 50 mm of rain falling in one hour. The reservoir has drawn water from the river on more than a dozen occasions since it opened, and the Kanda River has not flooded during that time. Plans call for the tunnel to be extended to Tokyo Bay, literally creating a second, underground Kanda River. The Kanda River Underground Diversion Channel Nipponia, No.23, December 15, 2002, Accessed on March 28, 2008
The Kanda River is also featured prominently in the multimedia project Kandagawa Jet Girls. It serves as the venue for all of the anime version's Jet Racing and VR training sequences as well as assorted other activities throughout the series.
(confluence with Sumida River)
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