Irrigate [water] their land to grow crops.
Irrigation
Farmers take or divert water from a river for irrigation purposes, and to water their crops.
They dug holes to move it and they built dams to make sure they had enough water but there crops didn't flood.
Irrigation
Farmers pumping river water and spraying the water onto their fields of growing crops is known as crop irrigation.
Rivers
The rivers were so important to the farmers in Mesopotamia because then the farmers can get water for their crops in order to trade for goods and services.
They used the rivers' water for irrigation.
they used rivers and streams to collect water
Replenish the soil and provide water for the crops.
The flooding rivers helped the farmers of ancient India by leaving fresh silt behind, which makes the land fertile.
If they flood they could damage the crops because farmers their plant crops close to the rivers so they get the water