Suppose you could build a toilet that is the same as your normal toilet, but the bowl is 3 ft tall, so that the height of the water column that rushes in during the flush is higher as well (as shown in the diagram). What impact would this have on the formation of clogs?
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Consider what happens when a toilet is functioning properly—it means that the pressure gradient across the U-tube is strong enough to propel the liquid, and whatever solid waste there is, over the neck and into the sewer pipe. Obviously, solid waste doesn't behave in exactly the clean way that our fluid-based arguments do.
Unlike fluids, it is possible for solid waste to form a physical barricade that wholly or partially blocks the connection from the bowl to the U-tube. In such a circumstance, it is necessary to apply a greater pressure than usual to move the solid mass through the U-tube and into the sewer pipe—this is the basic idea behind a toilet plunger.
However, if we were to make the toilet bowl higher (and thus the height of the water used to flush), the pressure gradient across the U-tube would be greater, and it could thus handle blockages which would have brought a regulation-height toilet to failure. Thus, higher toilet bowls would be one way to prevent blockage.
One clear drawback is that this would mean even more clean water being used to drive waste out from toilets. But it is a nice idea in theory.