Waterfall Sound Effects

[Wickedshifts]

I realize Blizz put alot of time & effort into the various music, voice overs, sound effects, and all around audio tracks for WoW. They all sound great the only problem I have with any of them is when im fishing next to a Waterfall... No matter how low I turn down the volume or how high I turn it up, it always seems to drown out the sound of the fishing bobber when I have a bite (no i dont sit & stare at the screen constantly while im fishing)

So I am asking if anyone knows of a way to disable the Waterfall sound effect completely so if im standing at the base of one fishing, I dont even hear it?