Which gets flooded first in an underground garage, the first or second basement level?
2 Answers
In underground garages, the second basement level gets flooded first. Underground Garage Overview: Refers to spaces where the floor level is more than half the room's clear height below the outdoor ground level. Multi-story and high-rise buildings require deeper foundations. To utilize this height, basements are constructed beneath the ground floor, which can both increase usable space and eliminate the need for backfilling, making it more economical. Underground Garage Classification: Basements are categorized by function into ordinary basements and civil air defense basements. By construction materials, they're divided into brick-walled structures and concrete structure basements. By design type, they're classified as full basements and semi-basements.
The flooding sequence in underground parking garages is quite complex, but in most cases, the basement level (B1) floods first as it's usually closer to the ground entrance. During heavy rain or floods, water easily pours into B1 from the ground-level entrance, and if the drainage outlets on B1 are poorly designed, water accumulates. With over a decade of driving experience, I've encountered several cases where underground garages flooded during storms – vehicles parked on B1 suffered the fastest. My neighbor's car got water damage from being parked on B1, and the repairs were particularly troublesome. From an automotive protection perspective, I recommend choosing parking spots on basement level two (B2) whenever possible, or installing waterproofing equipment in high-risk areas. Additionally, regularly check if the garage's drainage system is clear and inspect ground gutters for blockages before rainfall to reduce flooding risks. In short, safety comes first – always consider potential hazards when parking.
