"Water seeks its own level". What's a better phrase?

Question

This phrase having to do sometimes with flooding seems silly to me. What other level would water seek other than its own? Who can come up with a better phrase in 10 words or less? Thanks.

Answer 1

Water will flow in order to equalize hydrostatic pressure.

Answer 2

Heavy fluids go downward. When there's enough fluid that it can't go down, it creates a flat surface.

Answer 3

Water seeks to level itself.