Had an interesting one come up this weekend, asked a number of pros and haven't quite gotten a definitive answer. I will pain the picture best I can.
A creek routed underneath a fairway, at the other side of the fairway the creek comes out of a drain/culvert/pipe with a diameter of roughly 18 inches or so give or take and feeds into a small pond.
The hazard surrounding the pond is red and the edge of it is marked by a red stake on top the edge of the rough about a 1/2 yard from the mouth of the drain/pipe/culvert.
Now, the ball managed to get far enough inside the drain to be beyond the red stake on top of the edge of the rough.
We could clearly see the ball, however, it was out of reach of a club and arm.
Again, not in margin of hazard, clearly identifiable, inside of a man made drain/culvert/pipe.
So... what is the ruling?