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Application of Porous Pavement May 12, 2006 Richard Boase, P.Geo., CCEP North Vancouver District A Water Balance Perspective.

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Presentation on theme: "Application of Porous Pavement May 12, 2006 Richard Boase, P.Geo., CCEP North Vancouver District A Water Balance Perspective."— Presentation transcript:

1 Application of Porous Pavement May 12, 2006 Richard Boase, P.Geo., CCEP North Vancouver District A Water Balance Perspective

2 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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4 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

5 Single Family Rainwater Mgt. Population approximately 80,000 27,319 dwelling units (incl. M/F) 70% detached single family 11% increase in dwelling units

6 Single Family Rainwater Mgt. Science tells us that watershed health begins to deteriorate as a watershed moves beyond 10% total impervious surface area.

7 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

8 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

9 59% increase88% increase

10 Single Family Rainwater Mgt. How do we implement change?

11 Single Family Rainwater Mgt Rain Data (mm) Over 80% of rain = small frequent showers < than 50 mm We need a new approach

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13 Single Family Rainwater Mgt. Site Watershed Health WBM Building size Hard surface Landscaping

14 Single Family Rainwater Mgt. Yes we can make a difference if we have; Policies Bylaws Standards for “greener” designs

15 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!

16 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

17 Pervious Paving Could we adapt an existing use of open graded asphalt? Used as a tennis court surface Well draining More use year round

18 Pervious Paving Project Area 550 m 2

19 Pervious Paving Geotechnical Assessment First Variable permeability rates ( mm/hr) High fines content (18 – 45 %) Organic content under existing lane surface

20 Pervious Paving Geotechnical Assessment First Flat topography No ability to raise grade Concern about capillary action & fines

21 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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25 The End


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