Application of Porous Pavement May 12, 2006 Richard Boase, P.Geo., CCEP North Vancouver District A...
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Transcript of Application of Porous Pavement May 12, 2006 Richard Boase, P.Geo., CCEP North Vancouver District A...
![Page 1: Application of Porous Pavement May 12, 2006 Richard Boase, P.Geo., CCEP North Vancouver District A Water Balance Perspective.](https://reader035.fdocuments.net/reader035/viewer/2022081602/551b3af7550346cf5a8b6630/html5/thumbnails/1.jpg)
Application of Porous Pavement
May 12, 2006Richard Boase, P.Geo., CCEP
North Vancouver District
A Water Balance Perspective
![Page 2: Application of Porous Pavement May 12, 2006 Richard Boase, P.Geo., CCEP North Vancouver District A Water Balance Perspective.](https://reader035.fdocuments.net/reader035/viewer/2022081602/551b3af7550346cf5a8b6630/html5/thumbnails/2.jpg)
Why Change at All
•Why is this an issue?
•How do we implement effective change?
•How do we monitor results of decisions made?
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![Page 4: Application of Porous Pavement May 12, 2006 Richard Boase, P.Geo., CCEP North Vancouver District A Water Balance Perspective.](https://reader035.fdocuments.net/reader035/viewer/2022081602/551b3af7550346cf5a8b6630/html5/thumbnails/4.jpg)
Single Family Rainwater Mgt.
DNV encompasses 16,237 Ha. (63 mi.2)
•64.5% Wilderness Area
•19.5% Residential
•8.3% Urban Parks
•3.3% Conservation
•2.1% Industrial
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Single Family Rainwater Mgt.
•Population approximately 80,000
•27,319 dwelling units (incl. M/F)
•70% detached single family
•11% increase in dwelling units 1986-1991
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Single Family Rainwater Mgt.
Science tells us that watershed health begins to deteriorate as a watershed moves beyond 10% total impervious surface area.
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Aging SFD stock >50 years
Lower land value
Different appreciation for space
Total lot area = 1901 sq. m.
19% Hard Surface
53% Tree Canopy
15% Landscaping
13% Building Footprint
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New SFD stock < 10 years
Higher land value
Different appreciation for space
Total lot area = 1972 sq. m.
24% Building Footprint
25% Hard Surface
23% Tree Canopy
By Covenant
28% Landscaping
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59% increase 88% increase
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Single Family Rainwater Mgt.
How do we implement change?
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Single Family Rainwater Mgt.
2005 Rain Data (mm)
Over 80% of rain = small frequent showers < than 50 mm
We need a new approach
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74%71%
21% 23%
4 % 6%
0
2 0
4 0
6 0
8 0
1 0 0
Pe
rce
nt
of
To
tal
An
nu
al
Ra
infa
ll
L e s s th a n 5 0 % o fM A R
5 0 % o f M A R to M A R G re a te r th a n M A R
R a in fa ll E v e n t S iz e (m m )
T y p ic a l V o lu m e D is tr ib u tio n o f A n n u a l R a in fa l l
S o u th C o a s t (B u rn a b y M o u n ta in ) O k a n a g a n (K e lo w n a A irp o rt)
N ote : B urnab y M oun ta in M A R * = 7 0 m m K e low n a M A R * = 20 m m (*2 4 -h o u r ra in fa l l )
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Single Family Rainwater Mgt.
SiteSite
Watershed Watershed HealthHealth
WBMWBM
Building sizeBuilding size
Hard surfaceHard surface
LandscapingLandscaping
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Single Family Rainwater Mgt.
Yes we can make a difference if we have;
• Policies
• Bylaws
• Standards for “greener” designs
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Pervious Paving
We needed something to give us a nudge
Who would ever have thought it would come from a simple Council
discussion over a routine lane paving project!
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Pervious Paving
Open Graded Asphalt
• Hot mix asphalt with inter-connecting voids• Developed as a highway safety feature to
reduce hydroplaning, skidding and tire noise
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Pervious Paving
Could we adapt an existing use of open graded asphalt?
• Used as a tennis court surface
• Well draining
• More use year round
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Pervious Paving
Project Area550 m2
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Pervious Paving
Geotechnical Assessment First
• Variable permeability rates (50 -135 mm/hr)• High fines content (18 – 45 %)
• Organic content under existing lane surface
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Pervious Paving
Geotechnical Assessment First
• Flat topography• No ability to raise grade • Concern about capillary action & fines
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Pervious Paving
No alternative but to excavate and install a suitable sub base layer
• 300 mm thick base course
• 25 mm gravels with < 5% fines (75µm)
• 75 mm layer open graded asphalt
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The End