This map shows the maximum amount of rain that is likely to fall in any 24 hours over a 100 year period. The Canterbury Plains near Timaru are particularly dry. There, an average 1-in-100 year rainfall event would be 100–150 millimetres in 24 hours. By contrast, in the very rainy Hokitika catchment (dark blue) an average 1-in-100 year rainfall event would be 800 millimetres in 24 hours.
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