[CANUFNET] Trees and boulevards

[Ian Wilson]

Hi Julian,
This wasn’t designed so the trees would thrive – but my observation is that the roots managed to escape into the lawn area on the left side of the photo since the planting pits are directly adjacent to the lawn, whereas they were still struggling on the right due to the compaction. The trees on the right have since been removed and replaced due to a parkade expansion, this photo is from a few years ago.

cheers

Ian Wilson
Infrastructure Operations Manager | City of Kelowna
250-469-8842 | iwilson at kelowna.ca<mailto:iwilson at kelowna.ca>
Submit a request for service on the go | kelowna.ca<http://kelowna.ca/>
I acknowledge that my workplace is located on the traditional, ancestral, unceded territory of the syilx/Okanagan people.

From: CANUFNET <canufnet-bounces at list.web.net> On Behalf Of Julian Dunster via CANUFNET
Sent: Wednesday, September 29, 2021 7:07 PM
To: canufnet at list.web.net
Cc: Julian Dunster <jd at dunster.ca>
Subject: Re: [CANUFNET] Trees and boulevards

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So are the trees on the left of the image totally constrained on their right side with no possibility of roots under the sidewalk? And are the trees on the right side of the image totally constrained on all four sides?

My experience would be that the area for the sidewalk / road would have been heavily compacted  (Proctor 90% +) and then the road and sidewalk laid down. Do you know if the planting pits on the left side were extended into the grassed area or did the roots just manage to escape somehow?

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<http://www.dunster.ca>

www.treelaw.info<http://www.treelaw.info>

www.rinntech.info<http://www.rinntech.info>
On Tue/9/28/2021 12:59 PM, Ian Wilson via CANUFNET wrote:
All, we are having a bit of an internal debate about standards for local/residential roads and boulevards.  My observation is that trees that are planted in a boulevard behind a monolithic sidewalk (sidewalk up against the curb and planting area next to the property) generally do better. They have access to more soil volume in the front yard, they get more water and the boulevard is tidier since the homeowner treats it like part of their yard. Also fewer issues with roots lifting sidewalks. Some of our staff prefer the separated treed boulevard, for various reasons. Note, I’m not talking about busier roads where the trees in boulevards help to form a barrier from traffic.

We don’t have a lot of good examples here that directly show a comparison. Does anybody have some photos that might show the performance of trees on one side of the road in a separated boulevard, vs. trees on the other side behind the sidewalk?

Below is an example that doesn’t exactly show this, but it does show the value of soil volume, with the trees on the left side being able to access the lawn area behind the sidewalk, vs. the trees in “coffins” on the right. These are lindens planted at the same time.


[cid:image001.jpg at 01D7B8F2.28462100]


Ian Wilson
Infrastructure Operations Manager | City of Kelowna
250-469-8842 | iwilson at kelowna.ca<mailto:iwilson at kelowna.ca>
Submit a request for service on the go | kelowna.ca<http://kelowna.ca/>
I acknowledge that my workplace is located on the traditional, ancestral, unceded territory of the syilx/Okanagan people.

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