Map of Areas With Risk of Flooding Due to Overflow of the Kanda, Zenpukuji, and Myoshoji Rivers of the Arakawa River System (inundation duration)

1. About this map 2. Basic information

(1) Pursuant to the provisions of the Flood Control Act, this map shows the duration of inundation for the maximum assumed rainfall for sections subject to flood (1) Map created by the Tokyo Metropolitan Government warnings and those subject to water-level notification of the Kanda, Zenpukuji, and Myoshoji rivers of the Arakawa River system. Location map (2) Risk areas designated on March 30, 2018 (2) This river flood risk map shows the estimated duration of 50cm or deeper inundation that occurs due to overflow of the Kanda, Zenpukuji, and Myoshoji rivers resulting from the maximum assumed rainfall. The simulation is based on the situation of the river channels and flood control facilities as of the time of the (3) Released as TMG announcement No. 449 map's publication. (4) Designation made based on Article 14, paragraph 1 of the Flood Control Act (3) Because the simulation does not take into account flooding of tributaries or flooding caused by rainfall greater than the assumed level, by a storm surge, or by (Act No.193 of 1949) runoff of rainwater, the actual duration of inundation may differ from the estimates and inundation may also occur in areas not indicated on this map. Sumida River (5) River subject to flood warnings covered by this map Ekoda River Kanda River of the Arakawa River system (The flood warning section is shown in the Myoshoji River Kanda River table below.) Zenpukuji River

Nihombashi River (6) Rivers subject to water-level notification covered by this map Kanda River Zenpukuji River of the Arakawa River system (The water-level notification section is shown in the table below.) Myoshoji River of the Arakawa River system (The water-level notification section is shown in the table below.)

(7) Assumed rainfall Up to 153mm per hour and 690mm in 24 hours in the Kanda River basin [Relevant wards and cities] [Inquiries] Chiyoda-ku, Chuo-ku, Shinjuku-ku, 0 5 10km Disaster Prevention Section, River Division, Bureau of Construction, Tokyo Bunkyo-ku, Taito-ku, Shibuya-ku, Nakano-ku, Suginami-ku, Toshima-ku, Metropolitan Government Musashino City, Mitaka City Main Phone: 03-5321-1111

Legend Inundation duration (hours) - 12 12 - 24 24 - 72 72 - 168 168 - 336 Area with risk of flooding due to river overflow

River subject to flood warnings and rivers subject to water-level notification covered by this map

River Flood warning section / Water-level notification section

From near 3-chome 322 Inokashira, Mitaka City Left bank To the confluence point with the Sumida River Kanda River (River subject to flood warnings) From near 3-chome 322 Inokashira, Mitaka City Right bank To the confluence point with the Sumida River

From Zenpukuji 2-chome, Suginami-ku (upper end) Left bank To Wada 1-chome, Suginami-ku Zenpukuji River (confluence point with the Kanda River) (River subject to water-level notification) From Zenpukuji 2-chome, Suginami-ku (upper end) Right bank To Wada 1-chome, Suginami-ku (confluence point with the Kanda River)

From Shimizu 3-chome, Suginami-ku (upper end) Left bank To Shimo-ochiai 1-chome, Shinjuku-ku Myoshoji River (confluence point with the Kanda River) (River subject to water-level notification) From Shimizu 3-chome, Suginami-ku (upper end) Basin boundary Right bank 500 0 500 1000 1500 2000 2500 m To Shimo-ochiai 1-chome, Shinjuku-ku (confluence point with the Kanda River) Administrative boundary

This map was created using a 1:2500 topographic map of Tokyo. (Approval number) 29-toshikikou-464