4 sentences

1. 洪水是一场严重的自然灾害。

   hóng​shuǐ shì yī cháng yán​zhòng de zì​rán zāi hài.

   Flood is a serious natural disaster.

   Source: Dong Chinese Dictionary

2. 大水泛滥成灾。

   dà​shuǐ fàn​làn chéng zāi.

   The floods have caused widespread disaster.

   Source: Dong Chinese Dictionary

3. 这种古老的仪式旨在祛邪避灾。

   zhè zhǒng gǔ​lǎo de yí​shì zhǐ zài qū xié bì zāi.

   This ancient ritual is intended to ward off evil and avoid disaster.

   Source: Dong Chinese Dictionary

4. 每逢灾年，富商都会在门前向饥民施粥。

   měi féng zāi nián, fù​shāng dōu huì zài mén​qián xiàng jī​mín shī zhōu.

   In disaster years, wealthy merchants would serve porridge to the hungry outside their doors.

   Source: Dong Chinese Dictionary