Dimples
I owe my soul to the TRD store.
That's true to a point, water control features can be used to slow or prevent major erosion in normal circumstances. After a fire, the water load increases exponentially. It becomes difficult to predict where it will go and what it will move. On a small scale, you can guess and take measures to alleviate it, but when you're talking about almost 5 miles of shelf road the job becomes unmanageable, even if we had unlimited resources. The threat is not just to the trail surface, but even more the potentially unstable ground above and below it, which we don't have the means or ability to do anything about.
Pandemic and area closure aside, we could go in and make some small improvements to shore up some spots, but it would be a complete waste of time if one or more sections of shelf road completely disappeared later. The Apache Trail is a good example of what can happen after a fire- massive amounts of material on the trail, and sections of it fell down the mountain, just gone. No amount of preventive maintenance can stop that kind of destruction.
Don't we have a Geologist and a Geological Engineer in the club?