This is the 7932nd most frequent Japanese word.
増水
"増水" (zōsui) means "rise in water level" or "flooding."
In this sentence, '増水' is used to describe the swelling of a river caused by heavy rain.
昨日の大雨で川が増水しました。
The river swelled due to yesterday's heavy rain.
Here, '増水' indicates the high water level causing a disruption of services related to infrastructure.
増水が原因で橋が通行止めになりました。
The bridge was closed due to the increased water level.
In this case, '増水' refers to potentially dangerous rises in water levels, specifically addressed in planning for safety.