The domes in New Oroville are not built using the "Orion" stemwall system. They are built in what MDI calls the "Titan" design. The stemwall is airformed along with the dome, creating a vertically straight but horizontally curved wall that flows smoothly into the dome.
The "Orion" method creates flat wall sections, connected at the ends, that have a ring on top to connect the airform to.
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