The use of rivers for irrigation in agriculture began in about

The correct answer is: 6000 B.C.

The use of rivers for irrigation began in the lands of Egypt and Mesopotamia; the ancient civilizations used the water from Nile, Tigris, and Euphrates rivers when these were in a flooding state.

The flooding waters usually ocurred from July to December. The technique consisted in diverting the river water to the fields, and drained back to preserve the growing cycle.

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