What to Do if Water Starts to Enter the Underground Parking Lot? 8 Emergency Signals
Prioritizing Evacuation of People Over Vehicle Relocation in the Event of Underground Flooding
It's easy to think about the question of what to do if water starts entering the underground parking lot when heavy rain begins, but by that time, you may already lack sufficient time to make judgments. Typhoons and heavy rain can pose greater risks as they involve not only the amount of precipitation but also the terrain, drainage facilities, water levels, and movement routes.
This list organizes the official procedures step-by-step based on warning signals for evacuation and prohibited actions before water floods the underground space. It focuses on what signals to observe and when to stop moving or evacuate, rather than repeating general typhoon preparedness materials or home inspection lists.
Relying on a single source for safety information is inadequate. Weather alerts and radar show real-time weather, flood risk maps provide pre-scenario information, and disaster texts and on-site controls advise on actions that need to be taken immediately. Each serves a different role, so it's essential to check them all together.
The most important criterion is the safety of human life over vehicles and belongings. Avoid testing water depth after flooding occurs or going back underground; instead, determine high ground and stairways or detours in advance. In actual situations, always follow the guidance of fire, police, and local government authorities first.
Heavy Rain Warnings and Flood Disaster Messages
Heavy Rain Alerts and Flood Disaster Texts
Heavy rain alerts and flood disaster texts are essential items to check when determining when to stop accessing underground spaces. The risks of typhoons and heavy rainfall can vary greatly by time and terrain even in the same area, so do not conclude safety based solely on a single map or alert.
When checking, prioritize confirming local alarms before descending into the parking garage. Decide on your evacuation route and high ground before any risk signals appear, and once on-site control lines or evacuation guidance from managers begins, prioritize evacuation of people over vehicles and belongings.
Avoid situations where you go down alone to check the condition of your vehicle. Do not test the water depth and speed directly; instead, follow the latest disaster texts, weather alerts, and on-site guidance from fire, police, and local authorities.
Water Inflow at Parking Lot Entrances
Water Inflow at the Parking Entrance
Water inflow at the parking entrance is a check item to assess the possibility of external water flooding into the underground level. The risks from typhoons and heavy rainfall can differ based on time and terrain even within the same area, so do not conclude safety based purely on one map or alert.
When checking, make it a priority to move to higher ground without nearing the entrance. Decide on your evacuation route and high ground before any risk signals emerge, and as soon as on-site control lines or evacuation guidance from managers begins, prioritize moving people over vehicles and belongings.
Avoid confirming water depth with your feet or vehicle. Do not test the water depth and speed directly; instead, follow the latest disaster texts, weather alerts, and on-site guidance from fire, police, and local authorities.
Drain Backflow and Manhole Overflow
Drain backflow and manhole overflow are check items to assess early signs that drainage capability has been exceeded. Risks from typhoons and heavy rain can vary by time and terrain, even in the same area, so do not rely solely on a single map or alert to assess safety.
When checking, prioritize informing the management office and surrounding individuals and make your way to the stairs. Identify your evacuation route and high ground before any risk signals are observed, and as soon as on-site control lines or evacuation guidance begins, prioritize moving people rather than vehicles and belongings.
Avoid attempts to open drains or clear debris with your hands. Do not test the water depth and speed directly; instead, follow the latest disaster texts, weather alerts, and on-site guidance from fire, police, and local authorities.
Installation of Flood Barriers and Access Control
Installation of flood barriers and access control are indicators to check when determining that management authorities have started responding to flood risks. Risks from typhoons and heavy rain can differ based on time and terrain, even within the same area, so do not conclude safety based solely on a single map or alert.
When confirming, prioritize following guidance from outside the controlled area and abandoning vehicle retrieval. Determine evacuation routes and high ground before any risk signals arise, and when on-site control lines or evacuation guidance is given, prioritize moving people ahead of vehicles and belongings.
Avoid crossing flood barriers or disassembling them arbitrarily. Do not test the water depth and speed directly; instead, follow the latest disaster texts, weather alerts, and on-site guidance from fire, police, and local authorities.
Rapid Rise in Water Levels
Rapid Rising of Floor Water Levels
Rapid rising of floor water levels is an indicator to check when assessing that the available evacuation time is rapidly diminishing. Risks from typhoons and heavy rain can vary by time and terrain within the same region, so do not conclude safety based on a single map or alert.
When checking, prioritize using the closest stairs to move to the ground level. Identify your evacuation route and high ground before any risk signals appear, and when on-site control lines or evacuation guidance begins, prioritize moving people above vehicles and belongings.
Avoid situations where you linger to open your vehicle door or load your belongings. Do not test the water depth and speed directly; instead, follow the latest disaster texts, weather alerts, and on-site guidance from fire, police, and local authorities.
Blackouts and Lights Out
Power Outage and Lighting Failures
Power outages and lighting failures are items to confirm when assessing risks of losing visibility and sense of direction. Risks from typhoons and heavy rain can vary by time and terrain, even in the same location, so do not conclude safety based on just one map or alert.
When confirming, prioritize moving to the stairs while following walls and directional signs. Determine your evacuation route and high ground before risk signals appear, and when on-site control lines or guidance from managers start, prioritize people’s movement over vehicles and belongings.
Avoid calling the elevator or touching electrical equipment in water. Do not test the water depth and speed directly; instead, follow the latest disaster texts, weather alerts, and on-site guidance from fire, police, and local authorities.
Ban on Elevator Use
Prohibition of Elevator Use
Prohibition of elevator use serves as a check when assessing the risk of being isolated in an elevator due to flooding and power outages. The dangers posed by typhoons and heavy rain may vary by time and terrain, even in the same area, so do not conclude safety based solely on one map or alert.
When confirming, prioritize familiarizing yourself with the locations of fire doors and stairways. Before any risk signals appear, determine your evacuation route and high ground, and when on-site control lines or evacuation guidance is issued, prioritize people’s movement over vehicles and belongings.
Avoid the situation of choosing an elevator to get to higher ground as quickly as possible. Do not test the water depth and speed directly; instead, follow the latest disaster texts, weather alerts, and on-site guidance from fire, police, and local authorities.
Judging When to Stop Vehicle Movement
Decision to Stop Vehicle Movement
Decision to stop vehicle movement is the final decision point to check when prioritizing life over vehicles. Risks from typhoons and heavy rainfall may differ by time and terrain, even in the same area, so do not conclude safety based on a single map or alert.
When confirming, prioritize immediately following evacuation instructions from managers or fire authorities. Identify your evacuation route and high ground before risk signals become apparent, and as soon as on-site control lines or guidance from managers begins, prioritize the movement of people over vehicles and belongings.
Avoid situations where you return underground to retrieve your vehicle late. Do not test the water depth and speed directly; instead, follow the latest disaster texts, weather alerts, and on-site guidance from fire, police, and local authorities.
In dealing with typhoons and flooding, it's vital to act decisively when risk signals are visible rather than memorizing too much information. If water starts entering the underground space, or the road surface is obscured, and on-site control begins, you should abandon your vehicle and belongings and move to higher ground.
If you’ve identified warning signals and prohibited actions for evacuation before water fills the underground space, take the time to look over the high areas, emergency stairs, and evacuation facilities around your home and workplace. Also, keep in mind that even routes that appear safe on a map can be blocked due to construction, closures, or actual flooding, so it's best to plan for multiple evacuation paths.
Weather forecasts and risk maps serve as tools to secure preparation time, but they are not absolute safety guarantees. Strong winds and heavy rains can occur beyond forecast ranges, and small underground areas or alleys not shown on maps can become hazardous much more quickly.
Have a brief agreement with your family on who will help whom and where to meet up again. It's also helpful to keep disaster alerts active on your mobile phone and familiarize yourself with nearby landmarks and addresses for emergency calls to 119. In real disaster situations, the latest information and directions from on-site rescue organizations take precedence over this list.
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