The purchase came towards the end of an exceptionally dry autumn.
The cause may in part be exceptionally dry conditions during this period.
The shortages over the last couple of years were caused by exceptionally dry summers.
But he said they had been thwarted by exceptionally dry and windy weather conditions.
The company said last year's "exceptionally dry weather" meant the threat of a drought this summer remained "real".
The seepage data recorded during the 1926-1927 period shows that the dam was an exceptionally dry structure.
You want your plant well anchored and able to take in water efficiently, especially after the exceptionally dry spring we've experienced.
The year 2011 was also an exceptionally dry year.
In June 2012, during an exceptionally dry winter, the dam fell to 52% capacity fill.
If the summer is exceptionally dry, there may not be enough grass.