Sluice gates controlled the flow of water from lakes that were miles away, at a higher elevation. The water was mixed with the clay, the clay was raked and dried, and then it was sent on by rail and loaded through a chute into ships.
Below, just under the red building, the last tunnel opens onto the harbor.
Following the now-absent rail tracks rightward, the chute for loading boats is under the second yellow house.
Here's the chute from right in front of that house:
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