Patrick,
I see no correlation whatsoever between modern irrigation systems and fewer centerline fwy bunkers.
Don,
Wouldn't most centerline bunkers be wet most of the time ?
Especially when the golf course needed syringing ?
If they are drained properly and decent sand is used I can't imagine why they would be any wetter than a greenside bunker. I don't syringe fwys near as often as greens, and I try not to syringe anything all that much so from my experience I still don't see any correlation.
Wouldn't it also cause a problem with centerline irrigation systems where the main feeder line runs down the middle of the fairway ?
Mike Nuzzo and I designed the irrigation system at our new course here in TX and we have quite a few centerline bunkers. I flagged all the heads and mainline routes. If there was a bunker in the way of the mainline we just moved the mainline a bit, which wasn't hard as most mainlines were close to one side or the other and rarely ran down the middle.
If a head ended up in a bunker when we flagged our triangulated pattern, then we just cheated it a bit to one side or the other. If a bunker was in the way of a lateral line then we just went around. It really, really isn't an issue with irrigation installation if you've got someone in the field who can direct the process.