Question

mention four man made or artificial sources of water

Answer 1

Tap
well
Dams
Hand pumps
above mentioned are man made/artificial water resources....

Answer 2

There are various artificial source of water made by the man.  Some of them are following
1) Hand pumps    2) Well and tube wells
3) Dams               4) Artificial lakes
5) Artificial canals.
These type of sources are actually major provider of water now a day. They are made for different purpose .They may be for the usage of water for drinking or water for the agricultural lands irrigation or in order to save the water.