While you are at it, maybe check out water tunnels ("Qanat") [0] and windtowers ("Bâgdir") [1] as well. I especially like the subterranean aqueducts - they required highly precise slopes to both reduce sedimentation (via high enough water speeds) and erosion (via low enough water speeds) at the same time.
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[ 2.9 ms ] story [ 17.1 ms ] thread[0] https://en.wikipedia.org/wiki/Qanat
[1] https://en.wikipedia.org/wiki/Bâdgir