Incidentally, I just came back from a holiday in Madeira --- amazing place if you like mountains; the average altitude of the island is 1300m --- and it's covered with a network of tiny canals called levadas. These collect trickles of water from the high summits, which are usually covered in cloud; it doesn't rain much. So they're kind of the opposite of a qanat. Instead of the water table being underground, it's way up high.
https://goo.gl/photos/a7eNGyJtiztiDFA86
Epicly, a lot of the levadas are in grooves chipped into the side of cliff faces. You can just about extrapolate the slope in that picture. Unfortunately in the really scenic bits I was too worried about not falling off to take photos. Safety railings are things which happen to other people in Madeira...
Yup, like Kwisatz Haderach which is in Hebrew.