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      Green Laws      Green Laws                                                        • ti
                                                                                          tl

               & Community                                                                e

                                                 LSU Green Laws Research Project


                                Design                       Daniel Raggio




Louisiana Department of Agriculture & Forestry

 EBR Parish Tree And Landscape Commission               Photographs: Live Oak Gardens
                                                      Ltd.
                                                      Abbey Associates Landscape
    Community Landscape Codes
    Landscape codes or green laws are special parts of a
community’s zoning ordinance. Certain provisions are written
   to influence the design of parking facilities and make
      improvements to the environment of urban areas

 Notable codes include New York City, Gainesville, Florida,
 Cary, North Carolina, Davis, California, Portland, Oregon,
         Charleston, South Carolina, Austin, Texas,
            New Holland, Illinois, Dublin, Ohio
              Gross Ile Township, Michigan
                    Annapolis, Maryland
     and Mandeville, Louisiana require improvements
                to parking lot environments.
  Open Space Planting Requirements

Most codes require a specified amount of open space for the purpose
of planting trees or allowing permeable space to soak up storm water
or trap sediments. Open space planting is often measured by canopy
coverage or by DBH measure. DBH measure equates to the quantity
                           of trees on a site.
The Problem 1.
The Problem 2.
The Problem 3.
The Problem 4.
       Purpose of Open Space
       Planting Requirements
  Re-establish the urban forest following development

   Require a specified amount of open space for the
purpose of planting trees or allowing permeable space to
         soak up storm water or trap sediments

  Determine that an appropriate percentage of the site
         remain “permeable” and plantable
    Types of Requirements
  Lot sizes reduced but must be compensated by an
            equivalent area as open space.

At least 40 percent of the subdivision must be provided
 as open space to obtain a density of 2.3 units per net
                          acre.

The minimum size of such active recreation space shall
 be the number of square feet derived by multiplying
        gross land area by the applicable ratio
            Code Writing Essentials
                               Purpose
Open space for planting trees or for permeable space to soak up water
                              Location
             On development site, access to amenities
                                Size
               length, width, height, acreage, lot size
                        Design Composition
            Relation to existing lot size or development
                         Plant Specifications
     native, deciduous, evergreen, spacing, growth rate, existing
                         Related Elements
                Recreation, open space, permeability,
   A Visual
    Gallery
of Open Space
   Plantings
Visual Gallery 1.
Green space along riverfront
    – Chattanooga, TN
           Visual Gallery 2.
Planting along road and walkway – Chattanooga, TN
    Visual Gallery 3.
Open space percentage – Cincinnati, OH
    Visual Gallery 4.
Tree canopy density – Louisville, KY
        Visual Gallery 5.
Open space along roadside – Memphis, TN
          Visual Gallery 6.
Minimum open space (aquarium) – Chattanooga, TN
Aesculus (Buckeye)           Specimen Trees
Amelanchier (Serviceberry)      South Carolina
Asimina (Pawpaw)
Carpinus (Hornbeam)
Cercis (Redbud)
Chionanthus (Fringetree)
Cornus (Dogwood)
Crataegus (Hawthorn)
Diospyros (Persimmon)
Fagus (Beech)
Halesia (Silverbell)
Hamamelis (Witch-hazel)
Ilex (Holly)
Juniperus (Cedar)
Magnolia
Ostrya (Hophornbeam)
Oxydendrum (Sourwood)
Sassafras (Sassafras)
Tsuga (Hemlock)
              Typical Code Specs
                     City of Gwinnett

One (1) tree for each 25 linear feet of strip length shall be
provided. Deciduous trees shall be at least 2 inches in diameter
and evergreen trees shall be 6 feet in height at time of planting.
Trees shall be a species native or suitable to this region.

On each property for which a Tree Preservation and/or
Replacement Plan is required, existing trees shall be retained
and/or new trees shall be planted such that the property shall
attain or exceed a Tree Density Standard of 16 Tree Density Units
per acre, exclusive of any acreage within a zoning buffer and any
trees required to be preserved or planted within a zoning buffer
and except any other land area allowed to be excluded by this
article.
              Typical Code Specs
                       City of Chapel Hill
Required buffers shall be located along the interior or street lot
lines nearest the adjacent streets, land uses, or zoning
designations except where such lot lines are intersected by
crossing accessways or utility easements, or by a joint parking
area. Buffers shall not be located on any portion of an existing or
proposed street right-of-way or easement.

No tree greater than six (6) inches in diameter at breast height
(DBH) shall be removed for the purpose of surveying without a
permit issued by the town manager approving such action.
              Typical Code Specs
                         City of Charleston
One canopy tree shall be provided for each 50 linear feet of
parking, loading or vehicular use area perimeter. These trees may
be used to satisfy the interior parking lot landscaping
requirements.

All trees with a diameter breast height (DB(h) of 6 inches or
greater within buffers shall be preserved.

Paved areas shall not constitute more than 25 percent of the
protected area beneath a tree. Any paving, grading, trenching, or
filling within the remaining 75 percent of the protected area must
be approved by the Planning Director and may require specific
construction techniques be used in order to preserve the health of
the tree.
                        References
City of Gwinnett, Georgia Land Use Management, Appendix A,
Article 5.6, Landscaping Screening and Buffering

City of Charleston, South Carolina Development Standards,
Appendix A, Zoning and Land Development Regulations, Article 9.5,
Landscaping Screening and Buffering

City of Chapel Hill, North Carolina Land Use Management
Appendix A, Design and Development Standards, Article 5
……….

				
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