Having just run a little over 800' of PVC sch 40 pipe for my irrigation purposes I have a few comments here for your project. First, have you done your calculations for the GPM your going to get out of your 1" pipe? I opted for 1.5" pipe to get the GPM to the heads. There are loses at every joint/elbow/tee/valve and evern over the length of the pipe. Most commercial irr companies use the 1.5" to feed the system. I can get enough GPM to run 5 heads at once thus cutting the time pumping the water 800'. Are you going uphill/downhill?
Poly pipe had some advantages, but if you only get 100' rolls you might as well get the 20' lengths of PVC with the flared ends ready to fit and glue. You can glue almost as fast as you can walk. Getting that poly pipe to unwind can be very time consuming, plus you still have to get those fittings into the ends, plus the cost of the fittings and the SS worm clamps are $1/ea here.
The poly pipe is good if you have a lot of curves/corners to go around. Poly pipe can make a little better turn that PVC.

Deep, is only a concern if you've got to dig it up sometime to repair. (it does happen). I've run over PVC and it doesn't shatter but will flatten out. I'd got 18" in most spots since that's close to the 12" that most the valve boxes/covers are set for.

good luck.
gary

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