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This article presents a step-wise approach to give design practitioners an idea of where figures like ''the 90th percentile event'' and concepts like ''5 mm retention = 50% annual water balance target = 0.5 runoff coefficient'' come from.
This article presents a step-wise approach to give design practitioners an idea of where figures like ''the 90th percentile event'' and concepts like ''5 mm retention = 50% annual water balance target = 0.5 runoff coefficient'' come from.
The Ontario Ministry of the Environment Conservation and Parks, and other regulatory agencies perform much more rigorous statistical analyses than the example presented, and their resultant stormwater management targets vary accordingly.
The Ontario Ministry of the Environment Conservation and Parks, and other regulatory agencies perform much more rigorous statistical analyses than the example presented, and their resultant stormwater management targets vary accordingly.
==Example: City of Barrie, using years 2015 to 2017==
Daily rainfall records from ''BARRIE LANDFILL'' were obtained for the years 2015 - 2017, from the [http://climate.weather.gc.ca/historical_data/search_historic_data_e.html Environment Canada historical data record].