2013 alidp edmonton training - "slowing down on green roofs"
TRANSCRIPT
ALiDP - City of Edmonton Fall Training Event, November 25, 2013
Slowing Down On Green Roofs Presented on behalf of Greater Edmonton Green Roof Consortium
Wilma Leung CEng, MICE, LEED-AP Email: [email protected]
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Peak Flow Attenuation and Volume Reduction
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Peak Flow Attenuation
Source: www.ec.gc. ca
Or With Green Roof
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Volume Reduction
Source: environmentalsciencesociety. org
Engage. Innovate. Inspire.
Slowing Down On
Blue Roof
Source: www.perviouspavement. org
Source: Alumasc
Roof D
ischargeD
ownstream
Storm
Sew
er or
Com
bined Sew
er
Engage. Innovate. Inspire.
Slowing Down On
Blue Roof
Source: www.perviouspavement. org
DETENTION AND EVAPORATION OFFERED BY BLUE ROOFS
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Green Roof: Types
Intensive : > 8”, $$$$$
Extensive: 2” – 8”, $$, 17 – 50 lbs/sfBuilt-up or Tray Systems
Source: www.wbdg. org
Source: www.salinitymanagement. org
INTENSIVE SEMI-INTENSIVE EXTENSIVE
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, . . . Water designed to flow through medium vertically before laterally along drainage layer.
Source: www.greenroofplan. com Source: environmentalsciencesociety. org
VEGETATION
GROWING MEDIUM
FILTER / ROOT BARRIER
DRAINAGE
INSULATION
WATER-PROOFING
STRUCTURE
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, . . . Water designed to flow through medium vertically before laterally along drainage layer.
Special design considerations needed when designing a pitched green roof to preserve hydrological benefits of green roof.
Source: environmentalsciencesociety. orgSource: www.hydrotechusa. com
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration. . .
Source: www.princeton. edu
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration. . .
Source: www.emeraldinsight. com
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration. . .
Source: Kean University
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention
Source: Paul MJ & Meyer JL, and USEPA
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention
Source:environmentalsciencesociety. org
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Source:Hydrological performance of extensive green roofs in New York City: observations and multi-year modeling ofthree full-scale systems. T B Carson et al 2013 Environ. Res. Lett. 8 024036 doi:10.1088/1748-9326/8/2/024036
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Source: enr.construction. com
Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention
Source: enr.construction. com
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Source: www.emeraldinsight. com
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Source: prairieecosystems.pbworks. com
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Green Roofs: with cisterns or harvesting
Source: www.ce.t.kyoto-u.ac. jp
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Source: nusdeltares. org
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Green Roof: Effects of Rain Duration & Intensities
Source: uregina. ca (modified)
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Green Roof: Runoff Quality & Pollution Control
Source: www.lid-stormwater. net
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Hydrological Selection of Green Roof Components:
Drainage
• Low Transmissivity Drainage Fiber Mat• Drainage Layer
• Use of Lightweight Aggregate?• Plastic Drainage Sheets ?• Closed-cell polystyrene trays ?
• Maintain Aerated Conditions in the Growing Medium• Ability to Remove Excess Stormwater without Causing Erosion• Slope to Drain
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Hydrological Selection of Green Roof Components:
Growing Medium
• Sponge-like Water Holding Capacity• Inorganic Content & Material• Organic Content & Material• Saturated Weight of Growing Medium• Medium Thickness
Engage. Innovate. Inspire.
Slowing Down On Green Roofs Hydrological Selection of Green Roof Components:
Selecting Plants
• Drought, wind and ice tolerant• Prairie species• Avoid large drifts of single species• Water absorption• Requires very little or no irrigation • Requires very little or no fertilizer
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Impact of Green Roofs on Urban Catchment
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Engage. Innovate. Inspire.
Slowing Down On Green Roofs
Design Tools and Guidelines ?Listen to Bert tomorrow !
ALiDP - City of Edmonton Fall Training Event, November 25, 2013
Slowing Down On Green Roofs Presented on behalf of Greater Edmonton Green Roof Consortium
Wilma Leung CEng, MICE, LEED-AP Email: [email protected]
THANK YOU