Final answer:
Sink drains may include devices that speed up water flow by catching debris or promoting a vortex, which utilize principles of fluid dynamics for efficient drainage.
Step-by-step explanation:
Sinks designed for discarding mop water typically include floor sinks or utility sinks, but the question seems to focus on the enhancements made to sink drains to increase the speed of water flow. Often, these sinks have a device that creates a more efficient drain system. The device in question may be a type of strainer or screen that catches debris, which helps to prevent clogs. Another possibility is a specially designed shape of the drain that promotes a better vortex, leading to faster water evacuation. The design of these devices leverages the principles of fluid dynamics; when water spirals into a drain, it typically goes faster due to the reduction of friction and the concentration of the flow of water. This principle is similar to how a tornado's shape allows for rapid air movement. Helping the water to move in a smooth, spiral path can speed up drainage and make it more efficient.