Hi all. I'm not an irrigation guy. . . just dropping in from the commercial mowing forum because I have a question that I couldn't answer when searching. How deep do you bury sprinkler heads? On a small system I installed in my own lawn I have had to go back and raise nearly all the heads because when I set the heads to the proper depth, they sank down deeper after a month or two.. Perhaps I dug to deep with the trencher (BTW, how can you tell how deep you are digging? They don't have a depth indicator; I had to eyeball it and I only had one chance to dig because I was in a hurry to return the trencher to the renter). Thanks in advance.