5 sentences

1. 工人们正在疏通堵塞的河道。

   gōng​rén men zhèng​zài shū​tōng dǔ​sè de hé​dào.

   Workers are dredging the blocked river channel.

   Source: Dong Chinese Dictionary

2. 大雨过后，河道里的水变得很浑。

   dà​yǔ guò hòu, hé​dào lǐ de shuǐ biàn de hěn hún.

   After the heavy rain, the water in the river became very muddy.

   Source: Dong Chinese Dictionary

3. 为了保持河道通畅，水利部门每年都要浚河。

   wèi​le bǎo​chí hé​dào tōng​chàng, shuǐ​lì bù​mén měi nián dōu yào jùn​hé.

   To keep the river channels clear, the water conservancy department dredges them every year.

   Source: Dong Chinese Dictionary

4. 这条河道淤积严重，需要定期进行人工疏浚。

   zhè tiáo hé​dào yū​jī yán​zhòng, xū​yào dìng​qī jìn​xíng rén​gōng shū​jùn.

   This river channel is heavily silted and requires regular manual dredging.

   Source: Dong Chinese Dictionary

5. 由于地势的影响，河道里的水开始向高处倒流。

   yóu​yú dì​shì de yǐng​xiǎng, hé​dào lǐ de shuǐ kāi​shǐ xiàng gāo​chù dào​liú.

   Due to the terrain, the water in the riverbed began to flow backward upstream.

   Source: Dong Chinese Dictionary