灌漑 (kangai) means “irrigation” | MotiTan Japanese Dictionary

More examples

雨が少ない地域では、灌漑によって作物に必要な水を補います。ame ga suku na i chi iki de wa kan gai ni yo tte saku motsu ni hitsu yō na mizu o ogina i ma su

In areas with little rain, irrigation supplies crops with the water they need.

Describes directing water to cultivated land to support plant growth.

灌水kansui: The act of supplying water directly to soil or plants.
散水sansui: The spraying or sprinkling of water over land or plants.

作物を育てるために、農地へ人工的に水を供給すること。saku motsu o soda te ru ta me ni nō chi e jin kō teki ni mizu o kyō kyū su ru ko to

灌 (kan, "pour water") and 漑 (gai, "irrigate") combine in the compound 灌漑 (kangai), which names the act of watering farmland.

Irrigation can use canals, pipes, or sprinklers, so the word commonly describes an organized method of supplying water to crops.