[CANUFNET] Private Tree Protection

Wed Dec 2 21:16:46 EST 2020

Hello Crispin, 

In my experience, the Trunk Formula Technique provides inflated reproduction
costs when applied to individual trees within large compartments/groupings
of trees. Due to the density and coalescing crowns of the trees in these
compartments, basing the replacement calculations on the individual
trees/stems within the grouping can be considered to be superadequate in
that a lesser number of trees spaced appropriately could achieve the same
canopy area and benefit within a set period of time.

One alternative would be choosing an appraisal method within the cost
approach such as the Cost Compounding Technique (refer to the CTLA Guide for
Plant Appraisal, 10th edition) that will help you calculate a cost to
reproduce the overall utility of the canopy area being lost on an equal area
basis.  You could estimate how many caliper nursery plantings of similar
stature it would take to ensure replacement of the existing tree cover on an
equal area basis within a set period of time such as 25 years (this would be
the "years to parity" portion of the equation). I have seen undocumented
studies by industry colleagues suggesting that one 50mm caliper planting
will produce a canopy area of approximately 55m2 by age 25 yrs.  With this
assumption, you can infer that one 50mm caliper planting is required for
every 55m2 of removed canopy cover. For example, a 275m2 area of removed
canopy cover would need a total of five 50mm caliper plantings in order to
reproduce the total lost canopy cover within 25 years. 

You would then extrapolate the reproduction costs of these trees through the
cost compounding formula. Alternatively, you could come up with a cost to
replant each caliper tree and use this as a levy amount rather than the
appraisal result.

I hope that helps.

Andrew Smit
General Manager & Consulting Arborist
ISA Certified Arborist Municipal Specialist (ON1292AM)
Qualified Tree Risk Assessor (ISA, QTRA)
Qualified Tree & Plant Appraiser (ASCA)
Certified Butternut Health Assessor (BHA 673)

W: (705) 745-1803  |  M: (705) 927-3334
E: andrew at treescapecanada.ca 
W: www.treescapecanada.ca

Proud of our 22 year "no lost time" injury record!

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Message: 4
Date: Wed, 2 Dec 2020 16:59:13 +0000
From: "Wood, Crispin" <woodc at halifax.ca>
To: Canadian Urban Forest Network <canufnet at list.web.net>
Cc: Brian Geerts <GeertsB at cambridge.ca>, "Gempton, Shilo"
	<gemptos at halifax.ca>, "Holinsky, Michael" <holinsm at halifax.ca>
Subject: Re: [CANUFNET] Private Tree Protection
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Thanks for this Brian,

Do you apply the trunk formula for trees in naturalized areas? Or how do you
manage removals of large areas of trees?

Thanks also for the information about REEP. This is an innovative approach
to using these funds, and ties into another project we are working on.

Crispin

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CANUFNET
Sent: Wednesday, December 2, 2020 12:09 PM
To: 'Canadian Urban Forest Network' <canufnet at list.web.net>
Cc: Brian Geerts <GeertsB at cambridge.ca>
Subject: [External Email] Re: [CANUFNET] Private Tree Protection

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Good morning Crispin,
I developed the City of Cambridge private tree bylaw based on the economic
disincentive concept.  It uses the trunk formula method to apply a value to
any trees protected within scope of the bylaw; anyone can get an approved
permit if they pay the fees.  While the trunk formula method isn't the best
fit for every situation, it is a reasonable standard that the public can
understand and apply.  The fees go into a reserve account which funds a tree
planting program operated by a local not-for-profit REEP
(https://reepgreen.ca/trees/) that plants trees back on private property (no
funds are used for city tree planting).  It applies to development and
non-development scenarios.  You can review it here:
https://www.cambridge.ca/en/learn-about/resources/Private-Tree-Forestry-By-L
aw-124-18.pdf

Brian Geerts

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Shilo <gemptos at halifax.ca<mailto:gemptos at halifax.ca>>
Subject: [External] Re: [CANUFNET] Private Tree Protection

Hello Folks,

Council has asked Halifax Administration to investigate options to
incentivize tree retention on private lands scheduled for new development
(subdivisions etc.). I am curious if other municipalities have conducted a
similar jurisdictional review that they might be willing to share, or have
any experiences with private tree bylaws or other planning tools used to
either incentivize, disincentivize or compensate for urban canopy loss in
greenfield development?

I know some of you may have already responded to a colleague of mine via the
CUSP mind hive, and thank you.

Crispin Wood, MSFM
Superintendent of Urban Forestry
Road Operations & Construction
Transportation & Public Works
(902) 225-2774

H?LIF?X
PO BOX 1749
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