Evenstar: Poker runs are not races so I do not think that entrants would be allowed to exceed the speed limit. It is certainly a shame to loose all that income for some great causes.
I thought that you had to go real fast for barefooting as well. I guess it depends on the person. For example using the below info my ideal speed would be around 42mph but I have small feet so maybe more? My son would be about 25 mph. I did talk to a friend of mine that is nationally ranked and he runs much faster however....
This is the guideline that I found.
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Ideal Barefoot Speed
The old rule of thumb is:
Your weight divided by 10 + 20
This is just a general rule so you will need to experiment with whatever speed works best for you (the size of your feet can make a difference too). As you progress, you will probably want to go faster since the water feels much harder and easier to "stand" on at higher speeds. A few MPH makes a big difference! However, the falls are harder too so don't get too drastic with higher speeds!