Ive been on it and have barely gotten wet and Ive been on it and been complelty soaked. I think it may have something to do with how full your boat it is.
We rode in the second row and I only got a few drops on me. My FIL sat in the same row on the other end and was soaked. I think the guy in front of him ducked.
I sit in the back and duck. I don't know if the back gets less water, but I feel less guilty ducking if I know I'm not going to soak the person behind me.