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Of course, those benefits come with a cost. An underground conduit is more expensive than a simple channel on the surface, and not all the problems with topography are solved. This is Jawbone Canyon, one of the biggest drops for the first aqueduct. Rather than taking a major detour around it, the aqueduct descends 850 feet (or 250 meters) and then ascends back up. This type of structure is often called an inverted siphon. I’ve done a video on how these work for sewer systems, and I’ve also done a video on flood tunnels that work in a similar way, if you want to learn more after this.
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