Locating underground lawn sprinkler pipes
Often a sprinkler head near its supply pipe is also attached to a pipe about a foot long that is in turn tee'd into the supply line. This makes it easier to get the head at the right level when the supply pipe might be a little high or low in the trench.
A "main line" supply pipe out in the lawn will likely serve only about four heads. Additional main supply pipes for additional heads usually do not run in the same trench down the middle of the lawn with long lateral pipes to reach the various heads.
In the event a main line does serve many more than four heads, there will be (electrically operated) valves buried along the line here and there in the lawn with access covers, and with wires buried accompanying it.
I was going to suggest turning the sprinklers on, (putting trash cans over the ones nearest you) and using a stethoscope to listen to the ground starting near a head and working your way back to the house. I have not tried it.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.
Last edited by AllanJ; 11-09-2009 at 12:22 PM.