Can anyone tell me what might be the cause of my water turning like this?

http://i122.photobucket.com/albums/o271/nability/ScreenShot8_zps2adf1fd8.jpg

I'm using Open Cities and it seems to be linked with that because it was happening on a different play through and when removing OC it stopped. I thought it might have been a combo of WATER and OC but I'm using Pure Waters now and it still happening.

EDIT:

Forgot to mention if I go closer to it, it goes back to normal and it only happens at certain angles

That's the LOD water texture. I get it too from similar angles without OC.

I have seen this happen as well, but VERY rarely, and I have no idea what causes it.

How weird, it's the first time I've actually seen it happen and at the moment it seem to only happen in Whiterun as well on that one little stream.

Same, it only appears to happen in Whiterun, and I have noticed it with the stream that is next to the stairs leading to the Gildergreen.