An aquifer, a river, a lake or a dam. Also in desert countries the sea could be a source if desalination is used.
Rainfall
If drip irrigation is used non commercially, it uses fresh water out of the outside water faucet.
Irrigation
they invented irrigation because they were tired of the anual floods. they also thought it was easier to transport water. i dunno...thats wat im trying to figure out
The method is called irrigation and the water is passed through conduits or ditches called irrigation channels from the water source (well, river, stream) to where the crops need the water.
It is irrigation
It still is important. It is the only source of irrigation water.
Daniel F. Bowell has written: 'Treated municipal effluent as a source of irrigation water' -- subject(s): Irrigation water, Water reuse
Irrigation systems transport water from a water source, such as rivers or wells, to dry areas using canals, pipes, or ditches. This delivers water to crops for agriculture, helping to sustain plant growth in regions with limited rainfall. Different irrigation methods include surface irrigation, drip irrigation, and sprinkler systems.
Rivers and Lakes
They had no irrigation and needed a near-by water source to water their crops.
So they could water their farms.