Soil Volume and Urban Forest




    Henry Mayer, Miami-Dade County Cooperative Extension Service
                Jimmy So...
“Meeting the Goals
         of the Miami-Dade County
          Street Tree Master Plan”
                 •Planning
       ...
Trees Growing in Confined
                                        Soil Spaces

                                        are...
“The major impediment to establishing trees in paved urban areas
is the lack of an adequate volume of soil for tree root g...
Tree Plantings with restricted root zone areas
Comparative Soil Volumes
Brownsville Metrorail Station
Roots grow well beyond
           canopy edge




                           Dr. Ed Gilman, U of Florida

• Trees that nor...
How Much Soil ?
Larger Trees




                                 1200 CF
                                 Soil Volume =
 ...
Each Sq.Ft. of
canopy requires 1.5
    Cu.ft of soil

                      JAMES URBAN, FASLA, ISA
Trees with more rooting
         space survive winds better


                                       Campuses, Parks, Yard...
Plant the Easy Places First.




        1                      4
                                   City of Sweetwater

 ...
“ARBORIST NEWS”
INTERNATIONAL SOCIETY OF
ARBORICULTURE (ISA)
August 2008
“Downtown Kendall Urban Center District”




 “Street Trees: …minimum caliper of six (6) inches and a minimum clear
      ...
Cornell University




1. INCREASE ROOT ZONE AREA…
      Use “CU Structural Soils” or
      “Deeproot Silva Cell” Applicat...
“Deeproot Silva Cells”...




     JAMES URBAN, FASLA, ISA
Permeable Pavements…
           When integrated with “CU-Structural
           Soils” or “Deeproot Silva Cells” …


      ...
Permeable Pavements…




U.S. GREEN BUILDING COUNCIL (USGBC)
LEED (Leadership in Energy and Environmental Design) CERTIFIA...
Tree Grates…




      …”The grate girdles the trunk... If the tree doesn’t die
first, it may lift the grate and create a ...
Landscape code changes are
oftentimes tedious and lengthy…

Departmental Policy Decisions can
bypass this…
Upcoming SlideShare
Loading in …5
×

Soil Volume Structural Soils (Socash) 2008 Sept Miami Dade Ciab

1,204 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,204
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
1
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Soil Volume Structural Soils (Socash) 2008 Sept Miami Dade Ciab

  1. 1. Soil Volume and Urban Forest Henry Mayer, Miami-Dade County Cooperative Extension Service Jimmy Socash, ASLA, JFS Design Inc. CIAB Miami, 2008
  2. 2. “Meeting the Goals of the Miami-Dade County Street Tree Master Plan” •Planning •Planting •Pruning •Education and Growth •Best Management Practices (BMP) ROOT ZONE GROWING AREA “Design the soil space under and adjacent to the hardscape to sustain root growth – good trees well connected to the ground only develop if the roots have room to grow” “Miami-Dade County Street Tree Master Plan” Page 7- March 2007
  3. 3. Trees Growing in Confined Soil Spaces are Prone to Toppling… …Rate of growth is greatly reduced…and… will be short- lived. “Better to plant a 50 cent tree in a 5 dollar hole than a 5 dollar tree in a 50 cent hole”
  4. 4. “The major impediment to establishing trees in paved urban areas is the lack of an adequate volume of soil for tree root growth.” Urban Horticulture Institute December 2000
  5. 5. Tree Plantings with restricted root zone areas
  6. 6. Comparative Soil Volumes Brownsville Metrorail Station
  7. 7. Roots grow well beyond canopy edge Dr. Ed Gilman, U of Florida • Trees that normally grow a very expansive root system can become stressed and grow poorly in urban landscapes where soil space is limited • The result can be poor tree health, damaged sidewalks and curbs, and other problems
  8. 8. How Much Soil ? Larger Trees 1200 CF Soil Volume = 20’ x 20’ x 3’ depth 20” Trunk Diameter e e s iz f tre me ti o o volu Ra soil to More Soil JAMES URBAN, FASLA, ISA 20” Trunk Diameter Tree will require 20’ x 20’ x 3’ deep soil volume (min.).
  9. 9. Each Sq.Ft. of canopy requires 1.5 Cu.ft of soil JAMES URBAN, FASLA, ISA
  10. 10. Trees with more rooting space survive winds better Campuses, Parks, Yards Yards, Parks Street trees, Parking lots, Yards 91% 73% survival 64% survival survival 0 to 3 m2 4 to 7 m2 > 7 m2 (0 to 39 ft2) (40 to 75 ft2) (> 75 ft2)
  11. 11. Plant the Easy Places First. 1 4 City of Sweetwater 2 3 Develop design options that plant trees in large soil resources. JAMES URBAN, FASLA, ISA CIAB project
  12. 12. “ARBORIST NEWS” INTERNATIONAL SOCIETY OF ARBORICULTURE (ISA) August 2008
  13. 13. “Downtown Kendall Urban Center District” “Street Trees: …minimum caliper of six (6) inches and a minimum clear trunk of eight (8) feet at the time of planting.” TYPICAL MINIMUM SIZE OF 18’ OVERALL HEIGHT SITE PLAN PROVIDES STREET TREES BUT… IN 3’ X 3’ SQUARES…(27 C.F. OF SOIL VOLUME )! WILL THESE TREES GROW? HOW LONG WILL THEY LAST? …7-10 YEAR AVERAGE!... WHERE IS THE 1200 C.F. OF SOIL VOLUME?
  14. 14. Cornell University 1. INCREASE ROOT ZONE AREA… Use “CU Structural Soils” or “Deeproot Silva Cell” Applications 2. USE PERMEABLE PAVEMENTS…
  15. 15. “Deeproot Silva Cells”... JAMES URBAN, FASLA, ISA
  16. 16. Permeable Pavements… When integrated with “CU-Structural Soils” or “Deeproot Silva Cells” … “Vegetation is watered, reducing the need for irrigation … Ground water is recharged Water resources are preserved Stormwater runoff is reduced Stormwater runoff quality is improved.” www.CoolCommunities.org
  17. 17. Permeable Pavements… U.S. GREEN BUILDING COUNCIL (USGBC) LEED (Leadership in Energy and Environmental Design) CERTIFIABLE “Pervious pavements can be made of concrete, asphalt, open-celled stones, and gravel, that are mixed in a manner that creates an open cell structure allowing water and air to pass through. For example, porous concrete can pass 3-5 gallons of water per minute, which is far greater than most conceivable rain events and highly effective in controlling storm water drainage. “ www.CoolCommunities.org
  18. 18. Tree Grates… …”The grate girdles the trunk... If the tree doesn’t die first, it may lift the grate and create a hazard for pedestrians.” “New Urban News” February 2005
  19. 19. Landscape code changes are oftentimes tedious and lengthy… Departmental Policy Decisions can bypass this…

×