Comment by oceanplexian

I'm not sure why BBC finds it so fascinating that the Moors were able to dig ditches and channel water through them 500 years after the Romans had built highly advanced aqueducts in Spain (https://en.wikipedia.org/wiki/Aqueduct_of_Segovia, https://fascinatingspain.com/place-to-visit/the-best-of/the-...). All I can guess is that some civilizations are more in vogue than others. In fact when the Moors invaded Spain, they destroyed much of the Roman infrastructure in a fit of religious fanaticism so a great deal of it has been lost.