One of the things about the Mud Run you find out pretty quickly is that you will get wet. You will get drenched and it's going to happen soon.
Sometime during the first mile, there are a couple of water trucks unloading water on the runners. You basically have two choices: run through it or go around it. Last year, I ran around the first one and was surprised that I made it through without too much damage. The second one, I figured if I ran through it quickly I wouldn't get too wet. Big mistake. I took a head-on, direct blast of water and went from just a little damp to soaking wet.
I'm going to try and avoid the head-on water blast on Saturday.
Another random video I found. This one, the runner does well to walk around the water and avoid the water.
And here's sort of what it looks like from race level.