I like this mod - it make minecraft much more interesting - but the sound effect for large amounts of falling water could use some improvement in my opinion. I'd suggest a lower range noise sound effect, like a red noise sample - you can find numerous samples on youtube. Big waterfalls sound less like a hiss and more like a rumble.

I had to disable part of the waterfall effect because of client side sound lag. I think this is what you are experiencing. I need to devise a better algorithm to better simulate larger waterfalls.

Thank you for responding.

These Youtube links are good example of a noise-effect that is very much like a waterfall, as it uses Brownian noise along with 1/f noise and other lower noise sounds. Noise effects work great for repeating sound effects as there is no pattern for your ears to pick up.
https://www.youtube.com/watch?v=wU5jl2vHYTE
https://www.youtube.com/watch?v=KUCNFijZS-0

Compare with an actual waterfall:
https://www.youtube.com/watch?v=1sLMNR22d00
https://www.youtube.com/watch?v=G7ghL2CWn4I