Some channels were less than 60 feet [20 m] long, but others extended nearly a mile [more than a kilometer] and powered several mills stationed along the channel.
فكانت المياه تتجمع في البرك ثم تتجه الى الطواحين عبر القنوات ،‏ وتقوم البوابات بضبط تدفقها .‏