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Its accuracy is controlled by two major factors, its shape and the size of the aperture through which the water drains. - (Witness of Gor, Chapter 34, Sentence #96)

Clepsydras are of two sorts, the inflow and outflow varieties. The inflow devices add water to a container and the level in the container measures a unit of time; the outflow devices drain water, the time measured then by the level of water remaining in the vessel. The device in the quarters of the pit master was an outflow device. Its accuracy is controlled by two major factors, its shape and the size of the aperture through which the water drains. It tapers toward the bottom to keep the water pressure constant, that being required to regularize the speed of the flow, a larger amount of water over a larger area exerting a pressure equivalent in its effect to that of a lesser amount over a smaller area. The second major factor is the aperture itself. This is a drilled plug which is periodically replaced. - (Witness of Gor)