Hydrologic Performance of Three Partial-Infiltration Permeable Pavements in a Cold Climate over Low Permeability Soil
Publication: Journal of Hydrologic Engineering
Volume 19, Issue 9
Abstract
The hydrologic performance of three partial-infiltration permeable pavement (PP) systems was evaluated at the Kortright Centre for Conservation in Vaughan, Ontario, Canada over 22 months. Partial-infiltration systems allow some stormwater to infiltrate into native soils and drain excess water by way of underdrains. The native soils at Kortright are composed of clayey silt and silty clay till, with clay content ranging from 7 to 30%. Flow restrictors on the underdrains were adjusted to the smallest orifice possible to assess the potential for stormwater outflow volume reductions. The hydraulic behavior of the PP systems was compared with runoff from an asphalt parking lot control. Peak outflow rates from PP were 91% smaller than peak flowrates of asphalt runoff on average, and attenuation of stormwater was observed during all seasons. Stormwater was found to infiltrate at the surface of the PP systems throughout two winters. Although increases in outflow were observed during periods of seasonal thawing due to the delayed release of infiltrating stormwater, the PP systems (with restricted flows from the underdrains) reduced overall stormwater outflow volume by 43% and completely captured (i.e., infiltrated and evaporated) most rainfall events that were less than 7 mm in depth. The study demonstrated that in cold climates and over low permeability soils, partial-infiltration permeable pavements reduce the volume, peak flow, and frequency of storm flows. These changes to the hydrology of stormwater are important for achieving water quality benefits as well as sustaining a more natural water balance and flow regime.
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Acknowledgments
This research would not have been possible without the efforts of the Sustainable Technologies Evaluation Program (STEP) staff: Christy Graham, Matt Derro, Paul Greck, and Amanda Wilson. Financial support for this project was generously provided by the following organizations: Great Lakes Sustainability Fund, Toronto and Region Remedial Action Plan, Ontario Ministry of the Environment Best in Science Program, Ontario Ministry of Transportation, City of Toronto, Region of Peel, York Region, Metrus Development Inc., Interlocking Concrete Paving Institute, and Aecon. In kind-donations of services and materials were generously provided by the following organizations: Urban Ecosystems Limited (Engineering consulting services), Brown’s Concrete (Aquapave), Unilock (Eco-Optiloc), Lafarge (Hydromedia Pervious Concrete), Hanson (sampling vault), Ontario Ministry of the Environment (laboratory services), Armtec (pipes), Condrain (construction services), Dufferin Aggregates (aggregate base), and Layfield Plastics (liner).
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Information & Authors
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Published In
Journal of Hydrologic Engineering
Volume 19 • Issue 9 • September 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 19, 2012
Accepted: Nov 13, 2013
Published online: Nov 15, 2013
Published in print: Sep 1, 2014
Discussion open until: Nov 19, 2014
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