Here's the thing, let's say that...
- The current is fast enough that a chunk of swimmers would either go backwards or take so long to swim the first leg that they have no shot at the cutoff
- People will start the race regardless of their common sense assessment of ability to finish
- The number of weak swimmers will be a few hundred
- The race director & team will not be able to identify the week swimmers until they need rescue
- The rescues will need to occur in the first couple hundred yards of the swim, including some who are going backwards from the start
If those assumptions are valid, then the race would need to have a major percentage of its water safety volunteers stationed in a cluster at the first 100 yards of the start. That is not viable. So, if the conditions are even on the bubble, then the RD would have to shorten the swim.
But what if the RD would offer a short swim for those on the bubble, kind of like the wetsuit optional option when the water temperature is just a little over? They could do the race, but they would not be considered for awards or placing stuff. And, the threat/carrot is that if someone opts for the full swim and cannot make it, they DNF and are out. Seems like a cool out-of-box approach that could make everyone happy.
I did Gulf Coast 70.3 last week, and I am very thankful that the RD made the decision to let us swim. That race has fantastic water volunteer support, but the FB page said it had record DNF because of the swim.
Realistically, the Chattanooga 70.3 scenario is a fringe case. How many races have an upstream river swim? Is this the only one?
And second, how many times in its history has it been shortened (just 2017 and 2019, or more)?