unloading cargo from a boat onto land
Refers to the act of moving goods from a vessel to the shore or riverbank.
川揚げ作業は朝早くから始まった。
The unloading work from the boat started early in the morning.
pumping water from a river onto land
Used for drawing water from a river, typically for irrigation or other land-based uses.
川揚げポンプで田んぼに水を引いている。
They are drawing water into the rice paddies with a river pump.
Compound of 川 (kawa, 'river') and 揚げ (age, 'lifting up'). The exact historical derivation is uncertain.