3 sentences

1. 由于连日暴雨，河水泛滥成灾。

   yóu​yú lián​rì bào​yǔ, hé​shuǐ fàn​làn chéng​zāi.

   The river flooded and caused a disaster due to days of heavy rain.

   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. 网络上虚假信息泛滥，需要仔细辨别。

   Wǎng​luò shàng xū​jiǎ xìn​xī fàn​làn, xū​yào zǐ​xì biàn​bié.

   Fake information is rampant on the internet, and one needs to distinguish carefully.

   Source: Dong Chinese Dictionary