noun
drainage channel; drain; waterway
Refers to a constructed channel or ditch for carrying away excess water, such as in agriculture or urban drainage.
大雨で排水路があふれた。
The drainage channel overflowed due to heavy rain.
農地の周りに排水路を整備する。
They maintain drainage channels around the farmland.
排水溝 is a smaller drain or gutter, often found along roads or buildings, whereas 排水路 can be a larger open channel.
Compound of 排水 (drainage) + 路 (path, road). The term is transparently derived from its components.