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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.
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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.
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