Irrigation in the desert

By following the water’s path, Doudou and the gardener visit the gardens.
“ You see Doudou, says the gardener, the water is going to fill each of these small patches where I’ve planted seeds. Here are carrots, here courgettes, and here haricot beans.

- It’s funny says Doudou, it looks like small swimming pools. I’m very surprised, I couldn’t think of finding so much water in the desert. But where is this water coming from?
- I don’t know from where it is coming Doudou, but I know there is not so much. Water is a very precious commodity and it shall not be wasted. Come on, let’s go and see the old gardener, he will probably be able to tell us where the well’s water is coming from. ”