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Application of Porous Pavement

Application of Porous Pavement. A Water Balance Perspective. May 12, 2006 Richard Boase, P.Geo., CCEP North Vancouver District. Why Change at All. Why is this an issue? How do we implement effective change? How do we monitor results of decisions made?. What's the BIG deal?.

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Application of Porous Pavement

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

  2. Why Change at All • Why is this an issue? • How do we implement effective change? • How do we monitor results of decisions made?

  3. What's the BIG deal?

  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 1986-1991

  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. 13% Building Footprint 53% Tree Canopy 19% Hard Surface Total lot area = 1901 sq. m. Aging SFD stock >50 years Lower land value Different appreciation for space 15% Landscaping

  8. 24% Building Footprint 25% Hard Surface 23% Tree Canopy By Covenant Total lot area = 1972 sq. m. 28% Landscaping New SFD stock < 10 years Higher land value Different appreciation for space

  9. 59% increase 88% increase

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

  11. Single Family Rainwater Mgt. 2005 Rain Data (mm) We need a new approach Over 80% of rain = small frequent showers < than 50 mm

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

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

  14. 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!

  15. 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

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

  17. Project Area 550 m2 Pervious Paving

  18. Pervious Paving Geotechnical Assessment First • Variable permeability rates (50 -135 mm/hr) • High fines content (18 – 45 %) • Organic content under existing lane surface

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

  20. 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

  21. The End

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