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@The Puppet Man, well the pressure is coming from a horizontal pipe under the ground, so it's moving in a horizontal direction. Then it is forced upward to the surface. The original direction of the pressure is still influencing the water. So a circular pattern of pressure in the water is acting on the disk! The higher the velocity of the water in the pipe moving in the horizontal direction, the lower the pressure will be when it is directed upward
Bernoullis principle basically says that when the velocity of a liquid is increased, the pressure it exerts is decreased. That's why the disk doesn't fly off in the gif