洪 水(こうずい)

こうずい

noun

flood

1. flood, inundation

An overflow of water that submerges land which is usually dry, often caused by heavy rain, river overflow, or dam failure.

大雨(おおあめ)で川(かわ)が氾濫(はんらん)し、洪水(こうずい)が起(お)きた。

Heavy rain caused the river to overflow, resulting in a flood.

洪水(こうずい)で多(おお)くの家(いえ)が浸水(しんすい)した。

Many houses were flooded due to the flood.

洪水(こうずい)被害(ひがい)を防(ふせ)ぐため堤防(ていぼう)が作(つく)られた。

A levee was built to prevent flood damage.

洪水(こうずい) refers to large-scale flooding, typically caused by heavy rain, river overflow, or typhoons.

Common collocations

洪水(こうずい)が起(お)きる: a flood occurs
洪水(こうずい)被害(ひがい): flood damage
洪水(こうずい)警報(けいほう): flood warning
洪水(こうずい)に見舞(みま)われる: to be hit by a flood
洪水(こうずい)ハザードマップ: flood hazard map

Related words

氾濫(はんらん): overflow, flooding (often of rivers)
浸水(しんすい): inundation (water entering buildings)
堤防(ていぼう): levee, embankment
大雨(おおあめ): heavy rain

Cultural note

Japan experiences frequent flooding during the 梅雨(つゆ) (rainy season) and 台風(たいふう) (typhoon) season. 洪水(こうずい)ハザードマップ are widely distributed by local governments.

Related Words

Synonym: 氾濫(はんらん) (overflow (of river))

Related: 津波(つなみ) (tsunami)

Related: 浸水(しんすい) (inundation)

Related: 堤防(ていぼう) (levee, embankment)

Related: 大雨(おおあめ) (heavy rain)

Compare: 冠水(かんすい) (flooding)

general

Added 2026.1.16 11:32 · Revised 2026.9.2 12:02

05000/05065_kouzui