Are we underestimating extreme rain in a changing climate? Research finds atmospheric moisture is increasing

New research has found we are failing to take climate change into account when considering current and future rainfall extremes.

The Probable Maximum Precipitation (PMP) is theoretically the highest possible rainfall in a given location.

It is critical in calculating the Probable Maximum Flood (PMF).

These may be theoretical flood calculations but they are fundamental in making sure our dams and other infrastructure are built to withstand the worst that is thrown at them. 

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To see if the atmospheric moisture really has been rising, Mr Visser and his colleagues looked at the dewpoint record. 

Dewpoint is a measure of atmospheric moisture, taken regularly at weather stations around the country.

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Mr Visser stresses that these results are not a call for an immediate retrofit for all dams.

"It is really tough to give a general recommendation or a site-specific recommendation," he said.

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