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PRESENTATION: Sidewalks and Street Trees 09.20.2010






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  • Good Afternoon, Ladies and Gentlemen I want to thank Bob Campbell for giving me the opportunity to work on such an important project. We have a problem with Sidewalks and Street Trees. In the past year I have been around the country from Tampa to Seattle, to Miami and California – by Phone and Email - looking for answers. You will see the Results of Lessons Learned and How We can Do Things Differently!! In Our Approach you will hear from a professional engineer - Kim Ford, the Director of Transportation Maintenance - John Newton, and a Certified Arborist and Manager of our Natural Resources Program - John Schrecengost. I will be disappointed if you don’t have questions, so please feel free to note some items for discussion. We will have a time for questions at the end of the presentation and can go back to any slide. Let’s get started!
  • Good Afternoon, Ladies and Gentlemen The Goal is for our Residential Communities To Be ‘SUSTAINABLE’. For our purposes, ‘Sustainable’ is the ability to maintain our Communities, mainly our Sidewalks and even our ‘Street Trees’, with Limited Funds. There are Three Issues, nationwide and locally. You can see the UPLIFTED SIDEWALK in the picture. Our Sidewalks are being DESTROYED BY ‘STREET TREES’! Sidewalks must meet the Americans with Disabilities Act (ADA) Criteria, Our Trees are DAMAGED BY MAINTENANCE! REPAIRS WILL COST $30 Million by the year 2020. THE GOOD NEWS IS that when we are done, you will see that YOU CAN HAVE Sustainable Communities , with Safe Sidewalks and Healthy Trees!
  • Here are the RESULTS OF LESSONS LEARNED! Trees located at 34 Feet CAUSE DAMAGE Trees at 58 Feet are the ‘RIGHT TREES IN THE RIGHT PLACE’. The Recommended Tree Location provides ‘Better’ Healthier Trees WITH MORE ROOM TO GROW, and MORE AREA SHADED for More Energy Efficient Homes. and Lower Repair Costs, ALMOST TO ZERO!! It creates ‘Sustainable’ safe sidewalks that are MORE PLEASANT for users, and a HIGHER QUALITY OF LIFE !
  • PAUSE Here is an example of WHAT WE WANT TO DO with the Trees Behind the Sidewalk : We see Large Healthy Shade Trees With More Shade in the front yards, and shade for the street In this Neighborhood, there are very few damaged sidewalks. The Repair Costs are almost zero The photo shows 30 Years Old Trees BEHIND THE SIDEWALKS, separated by 70 Feet. The Recommended Tree Location is 58 Feet, 12 Feet closer for MORE STREET SHADE.
  • Here are more actual representations of what it will look like. The top picture shows the Miami Curb, the bottom picture shows the Barrier Curb.
  • Protection of the ‘Street Trees’ can be addressed by locating the trees in More Right-of-Way . A CRITICAL POINT IS: There Is No Loss Of Lots ! If the Right-of-Way is increased from 50 Feet to 60 Feet, the depth of the lots is reduced by 5 Feet. The building setback is reduced by 5 Feet! With the Sidewalks Slightly Shifted toward the LOCAL STREET, the Homeowners will perceive a larger front yard with greater separation between the home and sidewalk!!
  • In our Recommendations, there are 3 Parts to STOP THE UPLIFTING OF SIDEWALKS: 10 Feet of Separation from the tree to the sidewalk, and Root Barrier . Root Barrier is a Thick Piece of Plastic that is located along the sidewalk, 12 to 24 inches deep. It redirects the tree roots downward away from the sidewalk. For sidewalks less than 10 Feet from the Tree, Crushed Base is needed under the sidewalk, and the Root Barrier !! You will see why later in the presentation. This Design is strongly supported by data and literature
  • THERE ARE THREE OPTIONS for the ‘Street Trees’: OPTION A is the Status Quo, the Current County Standard. B and C are the Viable Options!! B and C have more choices.
  • Option A has: the tree in the narrow planting strip, 3 Feet from the sidewalk. It is our current County standard.
  • Option B1 has: the tree in an Easement, 8 Feet from the sidewalk.
  • Option B2 has: the Barrier Curb, with the tree in an Easement, 11 Feet from the sidewalk. The Barrier Curb helps keep Parking out of the Yard, and off the sidewalk!
  • Option C1 has: the tree in the ROW, 8 Feet from the sidewalk.
  • Option C2 has: the Barrier curb, with the tree in the ROW, 11 Feet from the sidewalk.

PRESENTATION: Sidewalks and Street Trees 09.20.2010 Presentation Transcript

  • 1. Sidewalks and Street Trees Along Local Streets in Residential Communities
  • 2. Goal: Sustainable Communities, Safe Sidewalks and Healthy Trees
    • Issues
    • Damaged Sidewalks
    • Unhealthy Trees
    • Costly Repairs
  • 3. Solution: An Alternative Tree Location Better Trees and More Shade Now 34 Feet Recommended 58 Feet
  • 4. Solution: An Alternative Tree Location
    • Healthier Trees
    • More Shade (lower home energy cost)
    • Safer Sidewalks
    • Cut Repair Costs (almost to zero)
  • 5. Solution: An Alternative Tree Location
  • 6. Protect Street Trees: In Right-Of-Way Existing 50 feet versus Proposed 60 feet Same Number of Lots and Larger Front Yards
  • 7. Prevent Uplifted Sidewalks
    • 10 Feet Separation from large trees
    • Root Barriers ($100 each tree)
    • Crushed Base (if located less than 10 feet from tree)
  • 8.
    • A — Status Quo
    • B — 50’ Right-Of-Way
    • plus Tree Easement
    • C — 60’ Right-Of-Way
    • with Trees
  • 9. Status Quo 50 Feet Right of Way 10’ 5’ 3’ 2’ 10’ Utility Easement Side- walk Traffic Lane Miami Curb Option A 25’ Half of ROW 5’ C L R/W Line
  • 10. 50 Feet ROW and Tree Easement
    • Option B1 – Miami Curb
    8’ 5’ Sidewalk 10’ Traffic Lane 2’ Curb 4’ Sod 10’ Utility Easement 5’ Tree Easement 25’ Half of ROW C L R/W Line
  • 11. 50 Feet ROW and Tree Easement
    • Option B2 – Barrier Curb with 6’ Sidewalk
    6’ Sidewalk 10’ Traffic Lane 2’ Curb 11’ 5’ Tree Easement 10’ Utility Easement 25’ Half of ROW C L R/W Line
  • 12. 60 Feet ROW with Tree
    • Option C1 – Miami Curb
    5’ Sidewalk 10’ Traffic Lane 2’ Curb 4’ Sod 30’ Half of ROW 10’ Utility Easement 8’ C L R/W Line
  • 13. 60 Feet ROW with Tree
    • Option C2 – Barrier Curb and 6’ Sidewalk
    6’ Sidewalk 10’ Traffic Lane 30’ Half of ROW 2’ Curb 10’ Utility Easement 11’ C L R/W Line
  • 14.
    • Sidewalks Damaged By Tree Roots
    • Cause: Current Requirements
    • Effect: Increasing Costs
    • Future: More Needs, Less Money
    • Requirements include: Land Development Code and
    • Transportation Technical Manual (typical section)
  • 15. Year 2009 $9 Million of Needs
    • 55 miles of sidewalks
    • require repairs
    Patch Grind Replace
  • 16. Typical Repairs Replacement Grinding
  • 17. Comparison of Miles of Repairs Relative To Funding 0 5 10 15 20 25 30 35 FY '10 FY '11 FY '12 Miles of Sidewalk $0 $1,000,000 $2,000,000 $3,000,000 $4,000,000 $5,000,000 $6,000,000 $7,000,000 Dollars of Funding Estimated Repair Total Un-repaired Backlog Estimated New Defects Funding 6 18 2 18 7 22 2 2 18 2 $1.2 M $0.4 M $1.4 M
  • 18. Public Works 2008 Survey Average Radius of Root Influence in Feet
    • Trunk Diameter
    • Type Tree 10 - 20 inches > 20 inches
    • Laurel Oak 11.3 13.0
    • Live Oak 7.9 17.1
    • Sycamore 8.9 16.0
    • Maple 10.4
    • Pine 8.4
    • Elm 14.7
  • 19.
    • Sidewalk 10 Feet From Tree
    • Trees Behind Sidewalk
    • Roots To Be Straight
  • 20. Soil required for trees by size at maturity Source: Urban Design for a Wind Resistant Urban Forest University of Florida 10’ 30’ x 30’ Large > 50’ 6’ 20’ x 20’ Medium < 50’ 2’ 10’ x 10’ Small < 30’ Distance from Paved Surface Soil Area Height or Spread
  • 21. Unsuitable Growing Area Leads to Unstable Trees Photograph by Chuck Lippi
  • 22. Tree Issues Related to Status Quo Vertical and Horizontal Clearance – 10 Years Planting Street Sidewalk Need 14 Feet Vertical Need 8 Feet Vertical
  • 23. Tree Issues Related to Status Quo Corrections – Reduced Shade, Appearance, and Health of Trees 10 year plantings 15 year plantings
  • 24.
    • Rate importance of each factor
      • 3 – High
      • 2 – Medium
      • 1 – Low
    Value Weighting Survey
    • Environmental Numerical Value
    • Tree Stability in Storms ____
    • Minimizing Tree Canopy Impacts ____
    • Minimizing Tree Root Damage ____
    • Tree Health ____
    • Costs
    • Construction (New) ____
    • Tree Maintenance ____
    • Sidewalk Maintenance ____
    • Liability Claims ____
    • Livable Roadways
    • Shading of Sidewalks and Streets ____
    • Sidewalks along Both Sides of Street ____
    • ADA Compliance ____
    • Roadway Aesthetics ____
    • Sustainability
    • Utilities ____
    • Sidewalks ____
    • Tree Resource ____
    • Fiscal Responsibility ____