[CANUFNET] Porous parking x-section for residential sub-divisions

[David Stevenson]

Hi Jeremy,

Not sure what the sub-grade requirements are for the following, but Chicago has a "green alley" system they have been installing throughout the city. Perhaps it would suit. You can read their propaganda at:

http://egov.cityofchicago.org/webportal/COCWebPortal/COC_EDITORIAL/GreenAlleyHandbook.pdf

Cheers,

Dave Stevenson, RPF
KBM Forestry Consultants
807-345-5445 x239


----- Original Message ----
From: Jeremy Gye <jgye at shaw.ca>
To: Canadian Urban Forest Network <canufnet at list.web.net>
Sent: Thursday, June 12, 2008 9:05:33 AM
Subject: [CANUFNET] Porous parking x-section for residential sub-divisions


All you Sudoku puzzle fans, its time for a break...here is a better puzzle:

Has anyone got any input regarding a x-section detail or specification for
the following application:

Context: new sub-division development with mature trees protected by
covenant.  

Needed: a construction detail for driveway and parking elements that must
encroach into the calculated critical root area.  

Considerations: 
    - large shallow-rooted trees on relatively flat ground with a root
restricting layer at 24 - 30"
    - impacts to tree root impacts must be miminal
    - hydraulic conductivity and healthy gaseous exchange must be
maintained to the root horizon beneath the drive and parking area 
    - assume organic (LFH) layer will be removed within the footprint of
the drive and parking area.
    - assume two possible sub-soil scenarios:
        1) a relatively trafficable mineral soil (e.g. a gravelly
loam)
        2) a more fragile mineral soil horizon (say a silty loam
with a well defined Ah layer)
    - the finished surface must be attractive and stable

I've considered a porous paver product (e.g. SF Rima or Aqua-Pave), but the
manufacturer's specified sub-grade requirements are lethal to the tree roots
(i.e. require excavated sub-grade of about 28").

Any thoughts?

Jeremy Gye
Gye & Associates - Urban Forestry Consultants Ltd
(250) 544-1700


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