You are entitled to take relief, without penalty, no closer to the hole. All water hazards are lateral and defined by red stakes or lines. Any ball that comes to rest on the clubhouse side of the cart path behind 18 green is Out of Bounds. All paved cart paths and granite tee signs are immovable obstructions. You are entitled to take relief, without penalty, no closer to the hole.
Most sprinkler heads have yardage plates attached.
These and all granite fairway markers are measured on a direct line to the center of the green. Dress code is strictly enforced.