In case of heavy rain in such a short time, the degree of inundation damage varies depending on the condition of the drain hole and the rain gutter on the roadside.
It is also confirmed in the experiment assuming various situations, and we also covered how the actual rain gutter management is being carried out.
By Nam Jung-min, staff reporter.
The rain gutter installed on the roadside collects rainwater from the ground and drains it into a sewer pipe.
However, if it is usually filled with garbage or if it is covered with a bad smell, it will not do its job when it rains.
Assuming a 50mm per hour torrential rain, normal rain gutters only filled up to 2.7 cm of water above the ground. The water overflows and fills the sidewalk.
In addition, when there is only soil and tree branches in the drainage ditch under the rain gutter, drainage continues. However, if garbage such as cigarette butts and plastic bags is mixed, the water flows back up and quickly flows back over the gutter.
The Seoul Metropolitan Government provides 4 billion won to each autonomous gu every year before the rainy season begins to inspect and clean the entire rain gutter, but this budget alone is not enough.
In fact, over 557,000 rain gutters installed throughout Seoul, the average number of cleanings this year was only 1.44.
If you do not regularly inspect and clean rain gutter and drains, you will be helpless in torrential rain.
[Jeong Do-jun / National Institute of Disaster and Safety Research Facility Researcher: (Gangnam Station in the past) I saw a bit of flood damage.
When I applied the rainfall at that time, it was analyzed that if two-thirds of the (rain gutter) were clogged, the flooded area would increase by more than 3 times.]
Above all, in order to maintain a state where drainage is possible, waste It is important not to throw them away.
(Video editing: Lee Seung-jin, data provided by: National Institute of Disaster and Safety)