TEPaul,
I read with interest, Simon Carr's account of Pine Valley.
Of particular interest was the irrigation system.
Carr indicates that a "complete" system was installed and that it consisted of a two (2) inch main laid over the whole course.
It would seem to make sense that this main would be extended to include the right side fairway on # 17.
Hence, I find the story as to the demise of the right side fairway on # 17, due to hose restrictions, to be in conflict with Carr's account.
I would suggest the following for your upcoming visit.
Rent the best Magnometers and Metal detectors you can and search for the main in that segment of the property that represents the abandoned 17th fairway.
If Carr is accurate in his description, it would seem that the main would remain intact today, below the ground.
It's unlikely that the main was dug up when the fairway was abandoned, hence, you may be able to locate them.
If they exist, I would imagine that the main would run the centerline of the right side fairway. Perhaps the photos and aerials can help you narrow your field of search.
I would suggest that you take colored marking flags with you, such that you can plot the main line on the surface, and from there, the margins of the fairway.
I hope you strike iron.
Good luck