Tokyo Metropolitan - Flood Control Integrated Information System (Bureau of Construction River Division) Provide
Information supply


Information supply

Purpose of information supply
・This website provides observed information of the rain gauges and the water level gauges of the rivers in Tokyo in real time.
・Please update yourself with the rainfall or river water rising condition to carry out flood prevention measures.
Notes
・Information may not be displayed or abnormal values may be displayed when the observation equipment is under maintenance or in failure.
・Depending on the circumstances, the administrator may change, suspend or cancel the information supply without notice.
・The information provider bears no responsibility for any inconvenience or losses which may occur related to activities carried out based on this information.
・Flood prevention measures when must be carried out promptly when warnings, alarms, special alarms are announced. Please refrain from making inquiries by phone or other means.
・Based on the river images and other conditions such as water level and rainfall, the flood risk will be assessed comprehensively and announced. Therefore, the river image may differ from the announced condition.
About screen display
・The homepage uses JavaScript. Please make sure JavaScript is enabled on your browser.
・We recommend screen resolution [800 × 600] or larger, Microsoft IE v11 or later, FireFox v44 or later, Safari v5 or later.
・The display of the screen may vary depending on your browser and display driver.
・The information is automatically updated every 5 minutes. Click the Auto update
10icon to terminate automatic update.

Top page

Sediment disaster alert information, flood forecast, well-known water level
・Display the sediment disaster alert information, flood forecast, water level announced in the city.
・Click the "Confirm announced information" button to display the details.
All area information
・When 【Rainfall / Water level / River image】 and 【Weather alarm】 are clicked, information regarding rainfall and river water level throughout the whole city as well as river camera installation location, weather warning, alarm, special alarm will be displayed.
・When the 【Flood forecast / Water level well-known river Announced condition diagram】 is clicked, the condition of the flood forecast rivers and water well-known rivers managed by the city and the state of the Standards Bureau will be displayed.
Information for each area
・When municipality name is selected, information regarding rainfall and river water level of the area and the installation location of the river camera will be displayed.
・When river name and observatory name is selected, the cross section of the river and the history data of the water level in the past 4 hours will be displayed.
History data (rainfall, water level)
・By clicking the date link, you can download history data for a day (0:00 - 23:50 of that day) in CSV format.
・You can download the data for the current month and the previous month.

Overall area information (【Rainfall / Water level / River image】 and 【Weather alarm】) / Information for each area

・Information regarding rainfall and river water level, as well river camera installation location, weather warning, alarm, special alarm will be displayed.
・When the area and municipality are selected, information regarding rainfall and river water level and the camera installation location in that area will be displayed.
Rainfall information
・Select the circle symbol of the rainfall observatory to display the current rainfall. Select the rainfall graph to display the following:
・In the 10-minute information display on the initial screen of the rainfall graph, the history data of the past 4 hours is shown.
・If you select to view the 1-minute information on the rainfall graph, the history data of the past 24 minutes is shown.
・If you select to view the 1-hour information on the rainfall graph, the history data of the past 24 hours is shown.
Water level information
・Select the triangle symbol of the water level observatory to display the current water level. Select the water level graph to display the following:
・The "Water level fluctuation" arrow indicates the "Fluctuation condition" of the water level, and the fluctuation of the river water level at the display time (the comparison between the water level 1 minute ago with the current water level) is indicated by the direction of the arrow.
・In the 10-minute information display on the initial screen of the water level graph, the history data of the past 4 hours is shown.
・When you select the 1-minute information on the water level graph, the history data of the past 24 minutes is shown.
・Since the cross section of the river is a schematic representation, it is different from the cross section of the actual place.
River camera Information
・Select the camera symbol which indicates river camera installation location to display the current river image.
・If the current image is being displayed on the river image screen, it is automatically updated every 5 minutes.
・If a past image is being displayed on the river image screen, automatic updating is not performed.
・On the river image screen, you can select and display images of the last 24 hours by clicking the button.
・The river image shooting range and shooting position may be changed due to equipment inspection or flood defense activities, etc.
・If a "Water level graph of nearby observatory" link exists on the river image screen, clicking that link will display the water level graph screen of the nearby camera installation location.

Overall area information 【Flood forecast river/Water level well-known river Announced condition diagram】

・The condition of the flood forecast rivers and water well-known rivers managed by the city and the state of the Standards Bureau will be displayed.
・When flood forecast and river water level information are announced, the color of the river will change to red.
Water level information
・Select the triangle symbol of the water level observatory to display the current water level. Select the water level graph to display the following:
・The "Water level fluctuation" arrow indicates the "Fluctuation condition" of the water level, and the fluctuation of the river water level at the display time (the comparison between the water level 1 minute ago with the current water level) is indicated by the direction of the arrow.
・・In the 10-minute information display on the initial screen of the water level graph, the history data of the past 4 hours is shown.
・When you select the 1-minute information on the water level graph, the history data of the past 24 minutes is shown.
・Since the cross section of the river is a schematic representation, it is different from the cross section of the actual place.

The condition of rainfall and river water level in Tokyo is displayed every 5 minutes. Please refresh the page to get the latest information.
Tokyo Metropolitan Bureau of Construction - River Division - Diaster prevention department S0000386@section.metro.tokyo.jp
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