Which river valley in the South Island Southern Alps holds the record for the highest annual rainfall in New Zealand, exceeding 11,000 mm?

Answer and explanation

Correct answer: A. The Cropp River catchment near Hokitika on the western slopes of the Southern Alps

  1. Step 1: Orographic lifting of moisture-laden westerly air over the Southern Alps produces extreme precipitation on the West Coast. Step 2. The Cropp River recorded 16,617 mm of rainfall in a single calendar year (1997-1998), among the wettest places on Earth. Answer: The Cropp River catchment near Hokitika on the western slopes of the Southern Alps. Why not the others: In contrast, towns east of the mountains like Alexandra receive under 400 mm annually.

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