Q. Is it possible to bury drip irrigation tubing?
A. Drip Irrigation tubing and drip tape can be buried underground and/or covered by mulch. Keep in mind that burrowing rodents, like gophers, can chew through the tubing seeking water, and with it being underground, it is harder to locate the leak. If you decide to bury your tubing, keep an eye on your system to make sure everything is running properly; so if a rodent does chew through the tubing, you can spot the problem immediately.
Once you have your trench dug and the tubing/tape laid out you will want to have the system pressurized before burying so the risk of tubing collapse is reduced. Installing an air vent vacuum relief valve would be a good idea in subsurface systems. Also, winterizing is still necessary if you live in areas where temperatures drop below freezing in the winter months.
Some of our customers like to install a flush valve end cap, like item #2020, to reduce the risk of debris being drawn in when the system shuts down. We recommend digging out a bit of soil below this end cap and filling with gravel for better drainage.