Unlike the concrete conduit, which really just acts like an underground canal with a roof, this is one of the places where the water in the aqueduct is pressurized. 850 feet of water column is about 370 psi, 26 bar, or two-and-a-half Megapascals. It’s a lot of pressure. These sections of pipe had to be specially manufactured on the East Coast, where the major steel facilities were, and transported by ship because of their size. They travelled all the way around Cape Horn, since the Panama Canal was still under construction. There are actually quite a few of these siphons crossing canyons in this section of the aqueduct, but Jawbone Canyon is the biggest one.
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，这一点在snipaste截图中也有详细论述
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