[CANUFNET] Constructing Driveways within Critical Root Zones

[Naomi Zurcher]

Actually, permeable pavers do not allow water / air to pass through the paver itself.Those pavers are either porous or pervious. Permeable pavers direct the water into the joints that surround each otherwise impermeable paver. 

All paving requires some form of maintenance and that needs to be a requirement if the usage of all these pavings. Every one of them comes with a maintenance protocol. If this were a parking lot, porous asphalt would be a viable solution but since this is a private driveway, then porous or pervious could work well provided that the maintenance regimen is followed.

Naomi   

> On Jul 14, 2020, at 11:34 AM, Julian Dunster via CANUFNET <canufnet at list.web.net> wrote:
> 
> My experience is that most so called permeable paving system do not last more than a few years. Then the fines clog up the pores and the surface becomes impermeable. Pavers are particularly bad for that. There is a better chance of infiltration if the paved area is flat and horizontal. If it has a slope, runoff is more likely, and in fact, most surfaces are sloped to prevent ponding and flooding, so designing for water infiltration is counter intuitive for the engineers. Gravel is the most effective long-term permeable solution, so grasscrete, ecoraster and similar contained gravel products work well. The porous concrete is a nice idea but again, if not cleaned, the pores clog up over time. If the surface must be sloped, slope it so that the water goes to a place where it can infiltrate in such a way that it helps tree roots. Oddly enough, asphalt sometimes works well because it tends to sweat, and underneath it there is a moisture layer than is root friendly, but then the roots grow close to the surface and heave the asphalt.
> 
> jd
> 
> On Behalf of Dunster and Associates Environmental Consultants Ltd.
> 
> 
> Dr. Julian A Dunster R.P.F., R.P.P.., M.C.I.P., ISA Certified Arborist,
> ASCA Registered Consulting Arborist # 378,
> ISA Tree Risk Assessment Qualified
> Honourary Life Member ISA + PNWISA
> 
> North American distributor for Rinntech
> www.dunster.ca
> www.treelaw.info
> www.rinntech.info
> 
> On Tue/7/14/2020 7:51 AM, Naomi Zurcher via CANUFNET wrote:
> 

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