Roundabout Explanation for a Pun

One of the most important things we look for when delineating wetlands is scour- evidence that water flows, removing leaves and topsoil.

Remember I'moscar.com from Arrested Development? There's no site I can link to- sad!- but when Oscar is mistaken for his brother George and arrested, he starts a website to prove his innocence: I'moscar.com

Later, Saddam Hussein tries a similar tactic.

Whenever there's a drainage that we don't have to map, I note "no scour" instead of all the other facts. Then I sing "I am no scour.com!"

It took me a while before I realized my boss had no idea what I was talking about.

Also welcome Cuervitito!