You have to bury electric wire? I am working on running a new higher amp power to my barn. I'm not sure how far down I have to dig. I am also going to run a water line while I have the trench dug. I know in my northern climate the frost line is 3 to 4 feet. I know there is no way I can dig that deep so my water line will be seasonal. I will have to blow all the water out for the winter. So depth for the water line is not a big deal.