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Building Markham’s Future Together
Journey to Excellence
Markham Green Road Pilot Project(14th Avenue and Middlefield Road)
Development Services CommitteeApril 21, 2015
Building Markham’s Future Together
Journey to Excellence
Environment Policies
Provincial, Regional, Municipal and Conservation
Authorities policies all require new growth to be
environmentally sustainable. The City’s Greenprint
is a long term plan to address the City’s
environmental health. The new Markham Official
Plan sets the blueprint for the growth of Markham
also places major emphasis on environmental
sustainability.
• .
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Evolution of Stormwater
Management in Markham
• .
Source: MOE Subwatershed Planning,
June 1993
Wh
at
is n
ext
& w
her
e d
o w
e go f
rom
her
e?
Current
Culvert Improvements Culvert Improvements
Major/ Minor System DesignMinor System Design
Prior to 1980 19901980
Erosion/Flood Control Works
Runoff Quantity Control
Floodplain Management
Culvert Improvements
Major/ Minor System Design
Erosion/Flood Control Works
Runoff Quantity Control
Floodplain Management
Erosion/Sediment Control
Water Quality
Culvert Improvements
Major/ Minor System Design
Erosion/Flood Control Works
Runoff Quantity Control
Floodplain Management
Erosion/Sediment Control
Water Quality
Fisheries/ Aquatic Habitat
Baseflow Maintenance
Water Temperature
Infiltration
Enhancement Opportunities
Monitoring
Culvert Improvements
Major/ Minor System Design
Erosion/Flood Control Works
Runoff Quantity Control
Floodplain Management
Erosion/Sediment Control
Water Quality
Fisheries/ Aquatic Habitat
Baseflow Maintenance
Water Temperature
Infiltration
Enhancement Opportunities
Monitoring
Woodlots
Wetlands/ ESAs/ ANSIs
Ground Water
Terrestrial Habitat
Geomorphology
Low Impact Development
Climate Change
Water BalanceIncrease focus
on SOURCE
CONTROL
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SWM Treatment Train Approach
• .
Source Controls
(e.g. Green Roofs)
Conveyance Controls
(e.g. Storm Sewer Pipes)
End-of-Pipe Controls
(e.g. SWM Ponds)
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Examples of Green Infrastructure for Source Control
Rainwater Harvesting
Downspouts Disconnection
Green Roofs
Soakaway Pit
Control of water quality,
quantity at the source.
Reduce reliance on the
end of pipe SWM facilities.
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Underground Stormwater Retention/Detention
Permeable Pavers
Bio-retention CellsVegetated Filter Strip/Swale
Examples of Green Infrastructure for Source Control
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New SWM Requirements
Identify “green” municipal infrastructure options to
achieve sustainability goals
Green roads option satisfies Provincial, Regional,
Municipal and Conservation Authorities policies
(sustainable growth, source control, etc.)
Need to evaluate costs and benefits of a “green” road
option with respect to design requirements, capital costs,
long-term performance, and operation & maintenance
requirements
Identify monitoring requirements to determine the
effectiveness and long-term function and reliability of the
“green” road design feature
Undertake “green” road pilot projects
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Green Road Pilot Project - 14th Ave and Middlefield Rd
SECC&L Park
Green Roads
14th Avenue
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• Control storm run-off quality and quantity at the source
• Maintain infiltration/recharge into the ground to mimic pre-development
condition
• Increase extent of urban tree canopy and vegetation to enhance
environmental performance and provide unique landscape aesthetic of the
Green Road
• Increase evapotranspiration to reduce the amount of storm water run-off
• Reduce the need for storm conveyance and “end-of-pipe” SWM pond
Environmental Performance of the Green Road
Bio Swales on both sides
of Green Road
Bioswales on both sides
of the Green Road
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How the Green Road Bio Swale Will Work (1)
Conventional
catch basin for
minor storms and
winter seasons
Conventional
Sidewalk
Increased tree
canopy
Bioswale
Underground pipe
to feed Bioswale
during minor
storms
Conventional curb
& gutter
Direct overflow
into Bioswale for
major storms
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How the Green Road Bio Swale Will Work (2)
Runoff(Minor Storm)
Runoff(Major Storm) Runoff
(Clean roof top)
Bioswale
Bioswale
Perforated
Pipe with
Silt Sock
Manhole
Cleanout
Perforated Pipe
Infiltration
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How the Green Road Bio Swale Will Work (3)
Excess Runoff
from
Major Storm
Major StormTo Sewer Main
Infiltration
Catch Basin
Runoff(Major Storm)
Runoff(Major Storm)
Storm Sewer
Main
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• New design with limited municipal experience on operations and maintenance
• Potentially increase in costs of O&M compared with conventional design
• More and different types of maintenance of bio-swales, street trees and vegetation
• An allowance will be included in the capital budget for additional operation and
maintenance costs during the pilot project period
Operational & Maintenance Challenges
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Partnership in Monitoring & Evaluation
• Work with the Toronto & Region
Conservation Authority (TRCA) to
monitor the effectiveness of the
design in managing runoff at the
source
• Work with City Operations and Asset
Management departments to
evaluate maintenance and
operational cost impact
• Work with Contractor and
Consultants to evaluate the design
and cost of green roads.
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Next Steps
• Subject to Council approval, Engineering, Operations, Asset
Management and TRCA to monitor the performance/effectiveness of the
Green Road pilot project for 2-3 years,
• Staff report back to Council on results of the monitoring program and
cost implications,
• If approved for future use, Engineering will develop design criteria,
implementation guidelines and operation and maintenance cost
estimates for the Green Road pilot project to be used in future
development applications (i.e. Future Urban Areas and the Remington -
South 14th Avenue subdivision) and capital projects, and
• If not successful, the pilot Green Road project would be converted to a
“conventional” stormwater conveyance system.
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Resolutions
• That the presentation entitled “Markham Green Road Pilot, 14th Avenue and
Middlefield Road” Project be received; and
• That the “Markham Green Road Pilot, 14th Avenue and Middlefield Road”
design concepts be endorsed in principle; and
• That Staff report back to Council on monitoring results, cost implications
and Life cycle and operation impacts prior to consideration for
implementation with future development applications; and
• That Staff be authorized and directed to do all things necessary to give
effect to this resolution.