<Anchor>
Autumn rain was predicted until tomorrow (10th), but this year there was a lot of rain damage.
In particular, the flooding in Gangnam, Seoul last summer is still vivid in my memory.
The huge space you see now is a facility that contains water to prevent heavy rain when it rains in the city.
Our reporters personally went inside to see how big it should be to prevent damage such as flooding in Gangnam.
Reporters Kim Hye-min and Lee Kyung-won will tell you in turn.
<Reporter Hyemin Kim> Step
on a small ladder and carefully descend, there is a huge facility like an underground bunker.
[Changjin Song / Team Leader of Disaster Prevention and Sewage Department, Namdong-gu Office, Incheon: When the water is no longer discharged at high
tide, the sluice gate works and the door opens and water is stored here.]
, If rainwater cannot escape due to heavy rain, it is stored here to prevent flooding.
It was designed based on the amount of rainfall that can only come once in 50 years, and the surrounding area has never been flooded since it was completed.
What about Gangnam, Seoul, which was damaged by record heavy rain in August?
Located in Yangjae-dong, Seocho-gu, Seoul, this rainwater storage facility is designed based on rainfall frequency of 30 years, not 50 years.
It was built to prevent flooding in Yangjae 2-dong, but it was helpless during the heavy rains in August.
[Lee Chae-young Supervisor/Facilities Manager: (When it rained a lot this time, (the storage facility) was also locked?) It was locked.
So I raised the water.]
[Mansik Hwang/Neighbors: (Nearby building) The basement was overflowing with water.
I threw it all away.
The ward office compensates for things like furniture.]
According to the current regulations, the frequency of rainfall for permanent structures is 50 years, and the frequency of rainfall for temporary structures is 30 years.
Although rainwater storage facilities are permanent structures, there are 30 locations nationwide that have been lowered from the 50-year standard to the 30-year standard.
<Reporter Lee Kyung-won>
Is it okay to build a rainwater storage facility based on the rain that comes once every 30 years, that is, the frequency of rainfall for 30 years?
According to the Ministry of Public Administration and Security, the maximum rainfall per hour for 30 years in Seoul is 94.3 mm.
SBS fact analyzed all the number of times the team exceeded this number since 2000, which can be analyzed based on detailed observation data for each region of the Korea Meteorological Administration.
If you look closely, it was calculated 6 times in 22 years from August 7, 2000 to August 8, last year.
It's not about the frequency of coming once every 30 years, but actually the frequency of about once every 3 or 4 years.
This means that the standards for rainwater storage facilities need to be revisited.
<Reporter Hyemin Kim>
The reason why the 30 facilities were built smaller than the standard, the answers from the local governments were all the same.
“The construction cost was too high, so the scale was reduced,” he said.
In addition, it is said that the closer to the city center, the more opposition from the residents was encountered when securing space for storage facilities.
[Song Jae-ho / National Assembly Administrative Safety Committee Member: Once this storage facility is built, it is almost impossible to further expand it or reinforce it newly.
It is said that it is very important to accurately predict and accurately trap rainwater and prevent flooding.] In
Tokyo, Japan alone, there is a very large storage facility capable of accommodating up to 1 million tons of rainwater, so flood damage rarely occurs.
Disaster management advanced countries focus on prevention and preparedness rather than response and recovery.
In order to prevent more frequent and stronger natural disasters, a sufficient budget and the understanding of the residents are required.
(Video coverage: Seo Jin-ho, Lee Seung-hwan, video editing: Kim In-sun, CG: Sung Jae-eun, Ahn Ji-hyun, Kwon Hye-min)