design elements - San Jacinto Texas Historic District

Guidelines for tree planting near utility lines.
Guidelines for tree planting appropriate to local conditions.
IMAGE: CONSERVATION DESIGN FORUM IMAGE: CONSERVATION DESIGN FORUM
Design & Maintenance Considerations
■
■
■
■
■
■
■
Parkway planter curbs should provide
enough space between them for
pedestrians to access the street edge.
Ornamental steel railings will require
frequent painting to protect them from
rusting. Aluminum railings should not be
used in high impact areas, or in areas with
signifi cant salt spray.
In soils with low permeability, drainage
needs to be provided at the bott om of tree
pits to prevent saturated conditions.
In urban areas, wire mesh may need to
be installed within a tree pit to prevent
rodents from nesting.
Root paths and structural soil may be
used to connect parkway tree planters to
each other, or to green spaces on private
property.
Root paths should be spaced four feet
apart in a radial fashion to connect each
tree to the adjacent green space.
The Urban Horticulture Institute at Cornell
University has detailed specifi cations for
structural soil. Care should be taken to
specify similar performance parameters.
(http://www.hort.cornell.edu/uhi/
outreach/csc/article.html)
Cost Considerations
■
■
■
■
Costs range from $14 to $18 for each lineal
foot of poured concrete curb and $50 to
$80 per lineal foot for an ornamental steel
railing installed.
Tree grates require a poured concrete curb
to support their steel frame. The curb will
cost $14 to $18 per lineal foot installed.
Cast iron tree grates cost $15 to $25 per
square foot.
Costs for root paths will range from $8 to
$12 per lineal foot installed.
Depending on the product specifi ed and
the proximity to the aggregate source,
structural soil will range from $50 to $80
per cubic yard installed.
SAN JACINTO TEXAS HISTORIC DISTRICT CORRIDOR STANDARDS │ 139