How were the hanging garden irrigated?

Answer 1

Babylon rarely received rain and for the garden to survive, it would have had to been irrigated by using water from the nearby Euphrates River. That meant lifting the water far into the air so it could flow down through the terraces, watering the plants at each level. This was an immense task given the lack of modern engines and pressure pumps in the fifth century B.C. One of the solutions the designers of the garden may have used to move the water, however, was a "chain pump."A chain pump is two large wheels, one above the other, connected by a chain. On the chain are hung buckets. Below the bottom wheel is a pool with the water source. As the wheel is turned, the buckets dip into the pool and pick up water. The chain then lifts them to the upper wheel, where the buckets are tipped and dumped into an upper pool. The chain then carries the empty buckets back down to be refilled.