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Adaptation of a Storm Drainage System to Accommodate Increased Rainfall Resulting from Climate Change

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Extreme rainfalls in southern Ontario may increase significantly as a result of climate change. This study was designed to determine the impact of a 15% increase in design rainfall intensities on drainage of a typical urban catchment and to investigate adaptive measures. A calibrated model (PCSWMM 2000) was used to: (1) determine the system performance under current and climate-changed design rainfalls; and (2) calculate the magnitudes of various adaptive measures required to reduce the peak discharge to current levels. For this type of catchment, effective retrofit options that provide the required peak discharge reductions included downspout disconnection (50% of connected roofs), increased depression storage (by 45 m3/impervious hectare), and increased street detention storage (by 40m3/impervious hectare).
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Document Type: Research Article

Affiliations: Department of Civil Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada. [email protected] National Water Research Institute, Canada Centre for Inland Waters, PO Box 5050, 867 Lakeshore Road, Bington, Ontario L7R 4A6, Canada.

Publication date: September 1, 2003

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