What causes a vortex in a lake?
What causes a vortex in a lake? Much like in a bathtub, a vortex opens up when water quickly rushes out of a basin -- perhaps through a drain or other exit -- so quickly that a swirling effect is created, churning the nearby water in the basin and sucking it down the vortex.
Is a whirlpool a vortex?
The best example of what is ordinarily thought of as a vortex is the whirlpool that is formed where the water runs out of a bath or basin.