<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial,helvetica,sans-serif;font-size:12pt"><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt;">Hi Jeremy,<br><br>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:<br><br>http://egov.cityofchicago.org/webportal/COCWebPortal/COC_EDITORIAL/GreenAlleyHandbook.pdf<br><br>Cheers,<br><br>Dave Stevenson, RPF<br>KBM Forestry Consultants<br>807-345-5445 x239<br><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">----- Original Message ----<br>From: Jeremy Gye <jgye@shaw.ca><br>To: Canadian Urban Forest Network <canufnet@list.web.net><br>Sent: Thursday, June 12, 2008 9:05:33 AM<br>Subject: [CANUFNET] Porous parking x-section for residential
sub-divisions<br><br><br>All you Sudoku puzzle fans, its time for a break...here is a better puzzle:<br><br>Has anyone got any input regarding a x-section detail or specification for<br>the following application:<br><br>Context: new sub-division development with mature trees protected by<br>covenant. <br><br>Needed: a construction detail for driveway and parking elements that must<br>encroach into the calculated critical root area. <br><br>Considerations: <br> - large shallow-rooted trees on relatively flat ground with a root<br>restricting layer at 24 - 30"<br> - impacts to tree root impacts must be miminal<br> - hydraulic conductivity and healthy gaseous exchange must be<br>maintained to the root horizon beneath the drive and parking area <br> - assume organic (LFH) layer will be removed within the footprint of<br>the drive and parking area.<br> -
assume two possible sub-soil scenarios:<br> 1) a relatively trafficable mineral soil (e.g. a gravelly<br>loam)<br> 2) a more fragile mineral soil horizon (say a silty loam<br>with a well defined Ah layer)<br> - the finished surface must be attractive and stable<br><br>I've considered a porous paver product (e.g. SF Rima or Aqua-Pave), but the<br>manufacturer's specified sub-grade requirements are lethal to the tree roots<br>(i.e. require excavated sub-grade of about 28").<br><br>Any thoughts?<br><br>Jeremy Gye<br>Gye & Associates - Urban Forestry Consultants Ltd<br>(250) 544-1700<br><br><br></div></div></div><br>
<hr size=1>Be smarter than spam. See how smart SpamGuard is at giving junk email the boot with the <a href="http://ca.promos.yahoo.com/newmail/overview2/"><b>All-new Yahoo! Mail </b></a></body></html>