河道 (hédào) means "waterway" or "river channel," referring to the course or bed through which a river flows. It can also refer to man-made channels used for irrigation or transportation. This term is common in discussions of infrastructure, geography, and water management.
这条河道已经干了好几年了。
Zhè tiáo hédào yǐjīng gān le hǎo jǐ nián le.
This riverbed has been dry for several years.
政府计划修整城市周边的河道。
Zhèngfǔ jìhuà xiūzhěng chéngshì zhōubiān de hédào.
The government plans to renovate the waterways around the city.
暴雨过后,河道里的水涨得很快。
Bàoyǔ guòhòu, hédào lǐ de shuǐ zhǎng de hěn kuài.
After the heavy rain, the water in the riverbed rose very quickly.