4 sentences

1. 这个下水道堵塞了。

   zhè gè xià​shuǐ​dào dǔ​sè le.

   This sewer is clogged.

   Source: Dong Chinese Dictionary

2. 雨后下水道堵塞，脏水一直往路面上泛。

   yǔ hòu xià​shuǐ​dào dǔ​sè, zāng​shuǐ yī​zhí wǎng lù​miàn shàng fàn.

   The sewers were blocked after the rain, and dirty water kept bubbling up onto the road.

   Source: Dong Chinese Dictionary

3. 这里的下水道系统负责把积水排泄出去。

   zhè​lǐ de xià​shuǐ​dào xì​tǒng fù​zé bǎ jī​shuǐ pái​xiè chū​qù.

   The sewer system here is responsible for draining away accumulated water.

   Source: Dong Chinese Dictionary

4. 这里的贫民窟由于没有下水道，卫生条件极其恶劣。

   zhè​lǐ de pín​mín​kū yóu​yú méi​yǒu xià​shuǐ​dào, wèi​shēng tiáo​jiàn jí​qí è​liè.

   Sanitary conditions in the slums here are appalling due to the lack of a sewage system.

   Source: Dong Chinese Dictionary