For pond water, your shader must have some diffuse in it, and it looks to me like you are not doing the Fresnel effect properly so it looks pretty fake.

There is a recent thread where I posted a lot of links to water tutorials - one of them discusses murky pond water quite a bit.

Go to the thread "on rendering water" and you'll find the links. The one where I wrote (pond, lake, river) is where you want to go but I suggest you read all of them.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)