The New Zealand Railways Magazine, Volume 1, Issue 8 (January 15, 1927)
Floods In The Grey River — Blackball Bridge Again Suffers, but is Speedily Repaired
Floods In The Grey River
Blackball Bridge Again Suffers, but is Speedily Repaired
On account of the proximity of the Southern Alps to the sea from which moisture-laden westerlies blow, the climate of Westland is very wet. Although the rainfall ranges from 70 inches per annum on the coast to 200 inches in the mountains it would be unfair to assert that it is always raining in Westland. The New Zealand Year Book reveals that the sunshine averages nearly 2,000 hours per annum in this part of the Dominion.
The rivers of Westland follow steep and rocky courses and after the torrential downpours in the mountains they become turbulent cascades. Their powers of corrosion and erosion cause much anxiety to bridge builders.