# Do waterfalls generate pink (1/f) or brownian (1/f^2) noise?

Does anybody know if natural waterfalls generate pink noise or brownian noise? I have tried to search about this but the matches are non-scientific and contradictory.

For example

Even though it feels weird, it could be that the type of noise is dependent on the size of waterfall, for example by affecting to alpha of the power spectral density of the broad definition of pink noise: $S(f) = 1 / f^{\alpha}.$