There must be hundreds of places around the world who could make use of this. How many other ones in Spain have been abandoned? If this was established by the Moors then I would guess other ex-Moor states would have a similar setup.
Sure thing! In Madeira they have many ancient aquaducts originally estabilished by the Moors:
https://en.m.wikipedia.org/wiki/Levada
Ancient water management is a fascinating topic.
The qanats in the middle-east, and north africa are particularly interesting. They are underground water conduits and sources dug by human muscles alone.