They can even be smaller than Bob, illustrated.
These were the subtle features I was trying to convey to Pat, in a diatribe about narrow fairways surrounded by thick rough. A majority of the courses that cover thier "little features", no matter how big, cover-up an interesting element for the shot maker to figure.
At Pacific Grove it was speculated that the lack of fairway aeration for at least a decade, caused the turf to have slight little ripples, maybe a 18-24 inches apart at their apex, with an elevation change of less than 3 inches. (That's a complete guess) I assure, those three inches mattered. Whether it was the downslope or up, it effected the shot.
David Toms lay-up on that par 4, in the playoff with Lefty a few years back, was dictated by the slight downslope his ball was on, thus making carrying the water, problematic.
George- Ken is know for having been rather meticulous with his fairway rolls and cants.
Pete Dyes CCoD's first, has a dimple plagued fairway. I find it rather lunar looking, but essential for a golf course to be considered great.
I suppose one or two flat spots would be acceptable, but no more than that.