Sorry to hear about your back Paul, but you will be happy to know I

about your water pipe. You should know by now that its a given (ie murphy's 3rd law of construction), that if you drive your crowbar into unchecked ground you will hit
a) A stormwater pipe
b) IF it will cause more inconvenience to you, a water pipe
or
c) IF it will cause you to look like a fool and inconvenience your neighbourhood, a sewer pipe or if using an excavator, the main coax telephone line between WA and the EAst Coast.
I wish I had a $100 for everytime I've had that happen or seen it happen to someone else. And the usual time it happens, 1:00 pm on a Sunday afternoon, after the hardware is closed.
BTW I love your pier. I'm really looking forward to seeing it installed. Either that or the next installment of "Rumples Riot builds an Observatory" Sorry mate I'm a cruel b*s*a*d like that. At least it didn't happen to me this time.