Near Yeoidyo Bridge, Olympic Highway
Around 1 a.m., an hour and a half ago
Starting to be partially flooded only in the first round 
Same place as of 2:30 a.m
Already mostly flooded
Precipitation in the area for an hour and a half is less than 1mm
It didn’t rain at all
a serious flood situation
Why? 
Update on the waterproof volume of the dam upstream of the Han River at 2:20 a.m
I’m pouring it out a lot 
The water level and flow rate observed at the nearby Han River Bridge
The water level is going up. Above all, the flow rate is going up
Even if all those dams close their floodgates right now,
If you calculate the time difference between the upper reaches of the Han River and Yeouido,
Control of Olympic Highway northbound by morning rush hour seems certain
Source: Seoul Transportation Information System Han River Flood Control Center