city of ottawa: “getting our feet wet” low impact development
TRANSCRIPT
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Resilient Rainwater Management: Stormwater Management and Adapting to a Changing Climate
RVCA ‐ October 30, 2014
City of Ottawa: “Getting Our Feet Wet”
with Low Impact Development
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Presentation OutlineresentationOutline
•Evolution of SWM in Ontario •Local context•Pilots/demonstration projects•What’s next?
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SWM 101
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Low Impact Development •Key objective: deal with rain where it falls• Filter/ infiltrate/ evapotranspirate/detain runoff throughout a site ‐ on lots, within the ROW, in parks, etc. •LID measures include various bioretention methods, pervious pavements, rainwater harvesting, etc.
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Why Low Impact Development?LID offers alternatives that can provide :
•improved performance by meeting multiple objectives •increased resiliency to severe rainfall events •lower or comparable infrastructure life cycle costs •retrofits in older neighbourhoods that developed with no runoff controls
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Local Context for LID
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Local Context for LID
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Sunnyside Avenue
Stewart Street
Former CFB Rockcliffe
LID/Retrofit Projects
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Sunnyside Avenue
10
Sunnyside Avenue
Outlets to the Rideau River
Bro
nson
Ave
nue
Ban
k S
treet
Sen
eca
Stre
et Study Area
Rideau River
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Sunnyside Avenue
11
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Sunnyside Avenue
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Stewart St.
The City of Ottawa is considering “greening” a two block section of Stewart Street to include features that improve the quality and reduce the volume of stormwater runoff in conjunction with the East West Bikeway project.
• ‘Green Streets’ integrate elements of standard streets such as traffic lanes for cars, sidewalks for pedestrians and bike lanes for cyclists with features that treat stormwater runoff.
• Multi‐purpose ‘green streets’ use soil, plants and trees to manage runoff by soaking it into the ground where it is treated. This concept is called “bioretention.”
Stewart 2 Blocks - 290m
Wilbrod
Nelson
King Edw
ard
Friel
Daly
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Stewart St.
• Stewart Street: one‐way street with 2 traffic lanes and a parking lane
• Existing pavement width can be narrowed by up to 2.2 m• Curbs can be extended to increase the boulevard width• Boulevards can be designed to provide stormwater
treatment and more green space in “bioretention” areas
potential bioretention areas/wider planted boulevards
What is being considered for Stewart Street?
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LID Demonstration Project
Former CFB Rockcliffe Redevelopment
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Former CFB Rockcliffe Redevelopment LID Demonstration Project
Former CFB Rockcliffe
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LID Demonstration ProjectCharacteristics:
• Demonstration Project = 11.6 ha
• 920 units of low-rise residential
• 6 local roads (20m ROW)
• 2 minor arterial (26m ROW)
• 2 park and 1 school block
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Proposed LIDs: Residential Units
Front Yard Soakaways Subsurface Storage &
infiltration of roof runoff
Overflow to storm sewer system
Source: UCC, 2013
Currie Barricks – Calgary, AB , Source: Aquafor Beech 2013
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Proposed LIDs: Residential Units
Soil Amendments 300mm of amended
topsoil over all turf and landscaped areas
8-15% organics pH 6-8 Organics = leaf, yard
waste and food waste in accordance with OMOE & CCME guidelines
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Proposed LIDs: ROW
Bioswales Linear bioretention units Planted or turf Local - low use roads
Seattle, WA
Cheltenham, ONMississauga, ON
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Proposed LIDs: ROW
Permeable Pavement Parking Lay-bys Concrete Paver units Open graded aggregate
base (no fines) Long-history of
implementation in Ontario Provides water quality
enhancements, run-off detention and infiltration benefits
San Francisco, CA
Mississauga, ON
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Proposed LIDs: ROW
Bioswales Permeable Pavement Lay-bys
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Planning & Implementation Process
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Planning & Implementation ProcessWhat’s Next?
•Complete pilots/learn from monitoring •Develop LID guidelines tailored to Ottawa•Complete City‐wide Retrofit Plan and implement