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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 12
Hydrol. Earth Syst. Sci., 21, 6461–6483, 2017
https://doi.org/10.5194/hess-21-6461-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 21, 6461–6483, 2017
https://doi.org/10.5194/hess-21-6461-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 18 Dec 2017

Research article | 18 Dec 2017

Does nonstationarity in rainfall require nonstationary intensity–duration–frequency curves?

Poulomi Ganguli and Paulin Coulibaly

Data sets

Annual maximum rainfall data EC (Environment Canada) http://climate.weather.gc.ca/prods_servs/engineering_e.html

Hourly (HLY) and daily (DLY) rainfall data ECCC (Environment and Climate Change Canada) ftp://client_climate@ ftp.tor.ec.gc.ca/Pub/Documentation_Technical/Technical_ Documentation.pdf

2011 census data and census digital boundary shape files Statistics Canada http://www12.statcan.gc.ca/census-recensement/2011/geo/bound-limit/bound-limit-2011-eng.cfm

Publications Copernicus
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Short summary
Using statistical models, we test whether nonstationary versus stationary models show any significant differences in terms of design storm intensity at different durations across Southern Ontario. We find that detectable nonstationarity in rainfall extremes does not necessarily lead to significant differences in design storm intensity, especially for shorter return periods. An update of 2–44 % is required in current design standards to mitigate the risk of storm-induced urban flooding.
Using statistical models, we test whether nonstationary versus stationary models show any...
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