Have you done any pruning on your grape vines in their first year? And if so how much have you taken off and when?
We got a grape vine this year and it's just starting to leaf its buds but I'm not sure when or if I should cut anything off it this year.
Also: for your irrigation line, you may want to look at mole-tunnelling (Horizontal Directional Drilling). That's what our neighbour used to get a water pipe under our drive.
http://www.moleuk.com/