The coriolis effect causes water to go down a drain clockwise or counterclockwise depending on which hemisphere you are in. Which way does it spin at the equator, and at the north and south poles?
Your question is counter-factual. It is a popular but false myth that Coriolis forces affect water swirling in basins or toilets. The Coriolis effect is a large-scale phenomenon that chiefly affects air masses moving from poles to equator, deflecting them eastward in such a way that they swirl counterclockwise in the Northern hemisphere and clockwise in the Southern hemisphere. While theoretically present, the effect is far too weak to make any difference in how water drains from a basin. Which way the water swirls depends mainly on the design of the basin and directionality of the water source. Answer originally posted in response to The coriolis effect causes water to go down a drain clockwise or…
