An NHK special report on Tokyo at risk from rain related floods

The reason for the special report is the governmental report released a few months ago, called 'Tokyo Metropolitan Area Submerged'.

In the video, computer graphics show the effects of the cases examined by the report; for instance, 300 mm per day will cause an estimated 6300 deaths. A big problem is that the current water systems are built to handle 50 mm of rain per hour, whereas the storm seasons in the past years have all seen more than 100 mm of rain per hour. The current focus is on better downpour prediction systems, so that citizens might be informed about evacuation possibilities.