A recent paper by Prof Michael Asten and Prof Ken McCracken looked at the floods in the Nepean and the water levels in Lake George for the past 200 years. It shows an 80-year cyclical pattern in the rainfall. The same pattern can also be seen in the Antarctic ice core records for the past 150,000 years. It suggests that in eastern NSW the next 40 years will be wetter than the past 40, and that Lake George will come up to the road (and maybe onto it).