Sorry Matt (and Matt). My mistake. If it is 70ML, then it really is tees and greens/surrounds, and perhaps a squirt on the fairways occasionally.
I know the irrigation numbers on a shorter Adelaide course with narrow fairways. Not dissimilar water requirements per sq metre to RM (and less than the Adelaide sandbelt). If we (?I) went firm and fast through summer, we could use less than 100 ML over the whole course. If we (?they) wanted lush fairways (not US lush, but green) but still dry roughs (no irrigation) we would get to 150 ML for the year. This effectivly combined about 800mm of rain (32 inches) with about a similar amount of irrigation.
Of course, the number of winter course drainage problems 'we' had just about disappeared when we irrigated at the lower level. They returned in subsequent years with the higher irrigation quantities
By the way, 70ML of water at traditional Melbourne 'town water' pricing of $1/kL is $70,000 worth. If the water was being 'created' through desalination (the most expensive option) then that price rises to perhaps $3/kL, or $210,000 worth of water. The pricing of River water has been bouncing around but is often perhaps half of the town water price these days (it used to be much, much cheaper).
James B