Aristotle had it all wrong.
Dalton, Horton, Sherman and Leopold played the starting gong.
Eagleson, Rodriguez-Iturbe went for a grand theory, in which they believed.
Ignacio (Vujica teaches) dated with randomness.
It is (dis-)organized complexity, Jim Dooge said.
Richards, Richardson, Harlan and Freeze insisted on using PDEs.
Horton said the runoff is infiltration excess,
Dunne said that it is saturation excess,
Hewlett and Hibbert said that overland flow is not necessary.
Tracer research screwed it all up.
Darcy and Buckingham — it is all a matter of gradients, they thought.
Beven and Germann set up a mountain of doubts.
And many, I forgot, I do not know.
(Klemeš complains.)
Now we do not really know what we know,
except that we know more than before,
better data we have,
satellites see it all (but what you see, you do not believe).
Modelers give numbers without caring,
machine learning thinks it can do all without understanding —
and because we did not have it when we thought we did,
they probably sing the right song.
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