How fast is fast?

[man4allcats]

I'm just wondering if anyone knows the answer to this. I don't, but I'll bet there are some physics/engineering types out there who do. On flushing the toilet a few moments ago, I was struck by the speed of the water at it's utmost point in the vortex. I realize this would vary among brands and perhaps water supplies; i.e. municipal vs. private wells, but on average, does anyone know approximately how fast the water is moving in say, m.p.h., in your typical American toilet? The reason that I ask about American toilets is because, like all true Americans, I feel that the rest of the toilet flushing world don't mean shit. Just curious.

[canetoad]

1. I guess you've never seen a long-drop dunny then.

Serious velocity.

[maine_raptor]

2. Who knows?

The speed of light used to be the limit, but now some folks in white coats and pocket protectors have gotten light to go even faster than that.