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Expanded Tree Pits as Part of a Low Impact Development Strategy for Urban Stormwater Management
Authors: Jing Ren
Identifier: CSBE19171
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Published in: CSBE-SCGAB Technical Conferences » AGM Vancouver 2019
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Description: Urbanization increases the impermeable surface area in cities, leading to changes in ecological resources such as water quality and quantity. Low impact development (LID) is an urban planning approach in which the natural hydrology is maintained as much as possible, to retain diverse ecological functions. The urban forest can be operationalized as part of LID, but a lack of information about the effectiveness of this approach impedes its adoption. We evaluated 24 specially designed tree pits in the Hochelaga-Maisonneuve area of Montreal, Canada, to assess their effect on the quantity and quality of stormwater runoff. The tree pits extended under the adjacent sidewalk to provide extra rooting volume. The sidewalk adjacent to some tree pits was made from permeable concrete, and the rooting volume of some tree pits was contiguous with the adjoining lawn. Soil water samples were collected regularly for a year using lysimeters installed at two locations and at three depths in each tree pit. Soil moisture and temperature at several depths and locations were recorded automatically, as were weather data near the site. Soil and water samples were analyzed for heavy metals and sodium. This information allowed us to interpret and model the water flow patterns and contaminant movement through the tree pits in response to differences in soil organic matter content and permeability of the surrounding surfaces. Our results will help city planners design better tree pits that divert more stormwater runoff to groundwater recharge and that moderate the contaminant concentrations in the runoff.
Keywords: Low impact development, Urban stormwater management, Green Infrastructure
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Date: 2019-07-15
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Conference name: CSBE/SCGAB 2019 Annual Conference, Vancouver, BC, 14-17 July 2019.
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Type: Presentation
Format:
Publication type: Text.Abstract
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Relation:
Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
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Other files:
DOI:
Description: Urbanization increases the impermeable surface area in cities, leading to changes in ecological resources such as water quality and quantity. Low impact development (LID) is an urban planning approach in which the natural hydrology is maintained as much as possible, to retain diverse ecological functions. The urban forest can be operationalized as part of LID, but a lack of information about the effectiveness of this approach impedes its adoption. We evaluated 24 specially designed tree pits in the Hochelaga-Maisonneuve area of Montreal, Canada, to assess their effect on the quantity and quality of stormwater runoff. The tree pits extended under the adjacent sidewalk to provide extra rooting volume. The sidewalk adjacent to some tree pits was made from permeable concrete, and the rooting volume of some tree pits was contiguous with the adjoining lawn. Soil water samples were collected regularly for a year using lysimeters installed at two locations and at three depths in each tree pit. Soil moisture and temperature at several depths and locations were recorded automatically, as were weather data near the site. Soil and water samples were analyzed for heavy metals and sodium. This information allowed us to interpret and model the water flow patterns and contaminant movement through the tree pits in response to differences in soil organic matter content and permeability of the surrounding surfaces. Our results will help city planners design better tree pits that divert more stormwater runoff to groundwater recharge and that moderate the contaminant concentrations in the runoff.
Keywords: Low impact development, Urban stormwater management, Green Infrastructure
Résumé:
Mots-clés:
Citation:
Volume:
Issue:
Pages -
Contributor:
Date: 2019-07-15
Technical field:
Conference name: CSBE/SCGAB 2019 Annual Conference, Vancouver, BC, 14-17 July 2019.
Session name:
Other information:
Type: Presentation
Format:
Publication type: Text.Abstract
Source:
Relation:
Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
Notes:
Other files:
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