HomeMy WebLinkAbout03062008 BSC Agenda Item 3
Page 1 of 1
Josie Orosco
Subject: FW: I can't attend March 6 meeting
Thanks, Josie.
You might also mention that I think we should recognize that different trees have varying canopy coverage for the
same diameter. For instance, a big pine would not have as large a canopy as a similar sized oak.
Frank
Josie:
I just realized that I won't be able to attend the March 6 BSC meeting - we will be out of town all week for Spring
Break.
If I were to leave a thought for the Commission for our next meeting, it would be to carefully figure out what our
canopy coverage target should be, and, what the canopy replacement requirement should be.
Right now we require an inch-for-inch replacement requirement, based on tree diameter. It would be very
expensive to require replacement of the total canopy associated with removed trees, so I think we need to come
up with a fractional canopy replacement rule that would be "reasonable".
Also, I'm not sure we came to a final understanding as to whether we would regulate removal of trees from
citizens' back yards.
Thanks,
Frank
p.s. I did a quick calculation, assuming a 20" diameter tree. If a tree like this was replaced with 5 four inch trees, I
estimate the smaller trees would provide 20% of the canopy cover of the original tree (assuming same type of
tree).
02/15/2008
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2/28/08 TREE REPLACEMENT COSTS UNDER CURRENT WEST UNIVERSITY PLACE
TREE ORDINANCES VERSUS REPRESENTATIVE PROJECT COSTS
REPRESENTATIVE PROJECT COSTS
$1 million represents a new 4000 square foot house on a 50 foot x 100 foot building site
$1.5 million represents a new 6000 square foot house on a 50 foot x 150 foot building site
$2 million represents a new 7800 square foot house on a 65 foot x 150 foot building site
COST OF REPLACING A 10" DIAMETER TREE
Trees required: One 4" diameter tree and three 2" diameter trees
Planted replacement cost: 1 x $1500 + 3 x $200 = $2100
Replacement cost as a percentage of a $1 million project: $2100 / $1000000 = 0.21%
Replacement cost as a percentage of a $1.5 million project: $2100/$1500000=0.14%
Replacement cost as a percentage of a $2 million project: $2100/$2000000=0.105%
COST OF REPLACING A 20" DIAMETER TREE
Trees required: Two 4" diameter trees and six 2" diameter trees
Planted replacement cost: 2 x $1500 + 6 x $200 = $4200
Replacement cost as a percentage of a $1 million project: $4200 / $1000000 = 0.42%
Replacement cost as a percentage of a $1.5 million project: $4200 / $1500000 = 0.28%
Replacement cost as a percentage of a $2 million project: $4200/$2000000=0.21%
COST OF REPLACING A 30" DIAMETER TREE
Trees required: Three 4" diameter trees and nine 2" diameter trees
Planted replacement cost: 3 x $1500 + 9 x $200 = $6300
Replacement cost as a percentage of a $1 million project: $6300 / $1000000 = 0.63%
Replacement cost as a percentage of a $1.5 million project: $6300 / $1500000 = 0.42%
Replacement cost as a percentage of a $2 million project: $6300 / $2000000 = 0.315%
**************************FOR OFFICE USE ONLY***********************
Inspection Date:
Species Type:
Inches Diameter:
Condition: 1) POOR 2) FAIR 3) GOOD 4) EXCELLENT
Species: 1) CLASS 4 2) CLASS 3 3) CLASS 2 4) CLASS 1
Size: 1) <8" DIA 2) 8-16" DIA 3) 16-25" DIA 4) +25" DIA
Aesth/Screen: 1) POOR 2) FAIR 3) GOOD 4) EXCELLENT
Energy: 1) POOR 2) FAIR 3) GOOD 4) EXCELLENT
Safety: 1) HAZ-LOW 2) HAZ-MED 3) HAZ-HIGH 4) NOT HAZARD
ADJ Trees: 1) MANY-HI 2) MANY-MED 3) FEW ADJ. 4) LONE TREE
H20/ROOTS: 1) POOR 2) FAIR 3) GOOD 4) EXCELLENT
Wildlife: 1) POOR 2) FAIR 3) GOOD 4) EXCELLENT
Age: 1) < 20 YRS 2) 20-40 YRS 3) + 40 YRS 4) Registered & Rare
TOTAL POINTS:
PERCENTAGE:
Replacement Inches: TOTAL:
Existing Trees: FRONT: REAR: TOTAL:
MPS Reduction Applicable? []Yes No
COMMENTS:
PERMIT DESCRIPTION:
NO REPLACEMENT REQUIRED DUE TO:
NO FEE PERMIT
West University Place Tree Classification
Class 1
Live Oak
Shumard Oak
Nuttall Oak
Water Oak
Bur Oak
White Oak
Swamp Chestnut Oak
Polymorpha Oak
Chinquapin Oak
Winged Elm
Cedar Elm
Drummond Red Maple
Baldcypress
Montezuma Cypress
Southern Magnolia
Little Gem Magnolia
Mexican Sycamore
Class 2
White Ash
Green Ash
Pecan
Hickory species
Black Walnut
American Holly
Sweetgum
Chinese Pistache
Texas Persimmon
River Birch
American Elm
American Sycamore
Class 3
Any species not included in Class 1, 2, or 4
Class 4
Chinese Tallow
Sugarberry (Hackberry)
Silver Maple
Arizona Ash
Chinaberry
"Replacement trees must be Class 1 or 2 and be a minimum of 6" diameter,
measured at 6" from grade. For every 10" of replacement required the applicant
must plant at least one 8" diameter (measured 6" from grade) Class 1 tree.
Notes for commission:
-When evaluating trees for removal, the Class 1 trees are worth more than the Class 2,
which are worth more than the Class 3. The Class 1 trees will require a greater percent of
their diameter to be replaced than the Class 2. And Class 2 require greater percentage
replacement than Class 3. The Class 4 trees are trees that do not do very well in West U
and tend to decline prematurely. Most of the Class 4 trees will not require replacement.
When replacement plantings are required we need to have a provision in the ordinance
addressing the available open area available to the new tree. If the determined open
area/planting area is not available (have not determined what that area is yet - maybe 200
square feet) then the tree should not be allowed to be planted there. If the required
planting area is not available then the replacement can be planted on adjacent lots within
1,000 feet, on public property (with appropriate open area), or credits purchased in the
tree trust.
2. TREE EVALUATION AND SITE PLANNING
The Urban Forester shall use the following criteria to evaluate Trees shown in Tree
Surveys and, working with the applicant and City building officials, the Urban Forester
shall prepare or approve Tree Disposition Conditions complying with: Chapter 6 of the
Code of Ordinances, this Chapter 2, the provisions of Chapter 3 (relating to mitigation, if
applicable) and the other applicable provisions of this manual.
While the guidelines set forth here are intended to be as comprehensive as possible, no
printed document can substitute for the knowledge and experience of a qualified urban
forester. The recommendations of the City Urban Forester may differ from a simple
"face value" interpretation of these guidelines; however, the Forester should work
cooperatively with the applicant and with City building officials to reach a mutually
agreeable solution. The Forester should also be prepared to justify "non-standard"
decisions by presenting the special circumstances that apply.
The process of Tree evaluation and site planning will include:
o The identification of all Trees 6" diameter and larger;
o An assessment of minimum standards for Tree preservation;
o An analysis of design constraints and alternatives; and
o The negotiation of mitigative measures when necessary.
2.1 TREE EVALUATION
The City's ordinances address the preservation of Trees 6" diameter and larger.
However, not all 6" diameter and larger Trees have the same value, due to such factors as
species or condition. Conversely, some smaller trees may have greater value due to their
rarity, screening potential or other factors.
2.1.1 Tree Evaluation Method
The following factors must all be considered in determining the value of any tree.
Weighing factors are included to aid in this determination.
Using these criteria, a designer can walk the project area and perform a rough analysis of
the tree situation before starting the design of the project. The Urban Forester should use
these same factors in approving the Tree Disposition Conditions.
Ten factors are included: condition, type, size, aesthetics, energy conservation and heat
abatement, safety, adjacent Trees, water quality protection and soil conservation, wildlife
habitat and historic significance.
The sum of scores for all ten factors determines the relative value of a Tree. In general,
Highly Valued Trees (total rating of 30 or more out of a possible 40) should be preserved
if at all possible. In all cases, the initial calculation of replacement inches required will
depend on the valuation and size of the Tree being removed.
2.1.2 Condition
In assessing a Tree's condition, the forester considers trunk condition, growth rate, tree
structure, insect and disease problems, crown development and life expectancy. A score
is assigned as follows:
1 = Poor
2 = Fair
3 = Good
4 = Excellent
2.1.3 Tyne
The species of Trees found in the City have been divided into four classes based on
overall quality. The chart in Appendix A indicates how each species fits in this general
classification. A score is assigned as follows:
1 = Class IV
2 = Class III
3 = Class II
4 = Class I
2.1.4 Size
Tree sizes are divided into four categories. A score is assigned for each size category as
follows:
1 = Less than 8 inches diameter
2 = Between 8 inches and 16 inches diameter
3 = Between 16 inches and 25 inches diameter
4 = More than 25 inches diameter
2.1.5 Screening; Aesthetics
Trees may score high in this area if they provide screening and privacy to the property or
if they are in good condition and have exemplary form. A score is assigned as follows:
1 = Poor
2 = Fair
3 = Good
4 = Excellent
2.1.6 Energy Conservation and Heat Abatement
If a Tree is shading a building or pedestrian use area in its existing situation, it receives a
high score under this category. The energy conservation and heat abatement potential is
also considered even if there are not obvious benefits, since trees in general cool the air.
For example, large Trees west of a buildable area will score high. A score is assigned as
follows:
1 = Poor
2 = Fair
3 = Good
4 = Excellent
2.1.7 Safety
If a Tree is in a hazardous situation due to external factors related to man-made features
(not inherent in the condition of the Tree), for example, its location relative to a road
intersection, etc., it receives a low score. Scores reflect the feasibility of mitigating the
safety problems and are assigned as follows:
1 = Hazardous; low mitigation potential
2 = Hazardous; medium mitigation potential
3 = Hazardous; high mitigation potential
4 = Not hazardous
2.1.8 Adiacent Trees
The proximity of other Trees has a bearing on a Tree's value. Everything else being
equal, a lone Tree has greater value than one Tree of many. The fate of other Trees in the
vicinity also affects this rating factor. A score is assigned as follows:
1 = Many Trees; high retention potential of adjacent Trees
2 = Many Trees; low retention potential of adjacent Trees
3 = Few adjacent Trees
4 = Lone Tree
2.1.9 Water Ouality Protection and Soil Conservation
Trees help reduce storm water runoff and enhance ground water recharge by breaking the
impact of raindrops and improving soil structure. A Tree's effectiveness in this capacity
is correlated with the size of the crown and root area. Large Trees with full crowns and
unrestricted root areas score highest in this category. A score is assigned as follows:
1 = Poor
2 = Fair
3 = Good
4 = Excellent
i i
2.1.10 Wildlife Habitat
This factor is rated on the basis of the intrinsic value of the type of Tree as a provider of
food and forage and general wildlife cover characteristics, or on the basis of field
observations of a particular Tree.
Regarding field observations, an individual Tree may rate higher than the assigned
intrinsic value of the genus due to such things as the presence of food-bearing parasites or
epiphytes or due to the potential for or actual presence of wildlife nesting cavities. A
score is assigned as follows:
1 = Poor
2 = Fair
3 = Good
4 = Excellent
2.1.11 Historical significance
The highest rating in this category is reserved for Trees that fit one of the following
criteria:
o The Tree is on a registry of historic or especially important Trees.
o The Tree has been documented as historically significant.
o The Tree is rare in the Houston area.
o Due to its location and size, the Tree serves as a significant landmark on the
landscape.
Since historical significance is largely a function of age, the Urban Forester's estimate of
the age of the Tree also has a bearing on this value. A score is assigned as follows:
1 = Less than 20 years old.
2 = Between 20 and 40 years old.
3 = Greater than 40 years old.
4 = Registered, rare or landmark tree.