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Table 1 Insured damages associated with flooding events (resulting from extreme rainfall) in New Zealand over the period 2007–2017 for the 12 costliest events where it has been possible to form estimates regarding the FAR of the rainfall event. Estimates of insurance costs for each event are in the column second from right in CPI-adjusted 2017 NZ$. These data were collected from the private insurers operating in New Zealand, so only include the types of assets that are typically insured, and only where insurance was actually purchased. These mostly include residential housing and privately owned commercial property. It does not include publicly owned property (such as council buildings) and infrastructure such as roads. The right-most column contains the insured losses attributable to climate change, i.e. the insurance loss estimate multiplied by the FAR of the event. The insured cost estimates are from the Insurance Council of New Zealand; no uncertainty estimates are available (obtained on 17/05/19). Full economic costs are expected to be far higher. See text for discussion

From: Climate change attribution and the economic costs of extreme weather events: a study on damages from extreme rainfall and drought

Year Date Location Climate change FAR Total cost ($m) best estimate Cost ($m) attributable to climate change
2017 3–7 Apr North Island 0.35 ± 0.2 91.46 32.011
2007 10–12 Jul Upper North Island 0.30 ± 0.2 72.7 21.81
2017 7–12 Mar Upper North Island 0.40 ± 0.2 61.7 24.68
2013 19–22 Apr Nelson, Bay of Plenty 0.30 ± 0.2 48.2 14.46
2015 18–21 Jun Lower North Island 0.10 ± 0.2 42.4 4.24
2016 23–24 Mar West Coast-Nelson 0.40 ± 0.2 30.9 12.36
2015 2–4 Jun Otago 0.05 ± 0.2 28.8 1.44
2015 13–15 May Lower North Island 0.30 ± 0.2 22.4 6.72
2011 29 Jan Northland, Bay of Plenty 0.30 ± 0.2 21.3 6.39
2014 8–10 Jul Northland 0.30 ± 0.2 19.3 5.79
2017 13–16 Apr Mostly North Island 0.35 ± 0.2 17.2 6.02
2007 29 Mar Far North 0.30 ± 0.2 15.2 4.56
Total attributable extreme rainfall insured damage costs $140.48