saan1 hung4

Jyutpingsaan1 hung4
Yalesān hùngh

Definition

Deluge caused by torrential water flow off a mountain after heavy rain or snowmelt

neutralnatureweather

How it's used

Refers specifically to sudden, violent surges of water in mountainous terrain, often occurring without warning after heavy rainfall. It carries a sense of danger and unpredictability, making it a common term in weather warnings and safety advice for hikers. Unlike general flooding, it emphasizes the rapid, downhill movement of water through narrow valleys or streams.

Examples

lok6 jyun4 daai6 jyu5 hou2 jik6 jan5 faat3 saan1 hung4
落完大雨好易引發山洪。
It is very easy for torrential floods to be triggered after heavy rain.
haang4 saan1 gin3 dou2 saan1 hung4 bou6 faat3 jiu3 zik1 hak1 zau2
行山見到山洪暴發要即刻走。
If you see a flash flood while hiking, you must leave immediately.

Common phrases

saan1 hung4 bou6 faat3
山洪暴發
flash flood

Common mistake

Learners often confuse this with general flooding, but it specifically implies a mountain source and rapid, destructive force. It is not used for urban street flooding, which is usually described as 水浸.

Tone guide

T1High level
T2High rising
T3Mid level
T4Low falling
T5Low rising
T6Low level