The only suggestions about the crown were a 1-1.5% slope, which should end up about 20 inches from sideline-to-sideline. What I didn't know was that the crown should also go from endzone-to-endzone, making the 50 yard line in the middle of the field a peak, technically.
But the crown was for drainage, and so it's a suggestion for grounds crews - having it as a competitive advantage to be monitored wasn't even a thing. If your field drained ok with a small crown, it would drain better with a more substantial one. I'd guesstimate that grounds crews, over time - and innocently - created more and more radical crowns on natural fields.
I guess I doubt that a really savvy option coach would be able to convince anyone that the cost necessary to increase the crown of a carpet-on-concrete situation. I don't know, part of me thinks "that wouldn't be rational" and the other part of me things "was anything rational about big-time college football coaching in the 70s?".
