Cross Culverts

Some articles on culverts, cross culverts:

Panama Canal Locks - Filling and Draining
... Embedded in the side and centre walls are three large water culverts, which are used to carry water from the lake into the chambers to raise them, and from ... These culverts start at a diameter of 22 ft (6.7 m), and reduce 18 ft (5.49 m) in diameter — large enough to accommodate a train ... Cross culverts branch off from these main culverts, and run underneath the lock chambers to openings in the floors ...

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