design elements - San Jacinto Texas Historic District

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Urban Tree Protection Measures Defi nition One of the biggest obstacles to growing healthy trees in urban environments is soil compaction. In parkway areas, compaction can result from frequent foot traffi c and from the installation of adjacent curbs and sidewalks. When soils are compacted they prevent water and air from reaching the tree’s roots. Urban trees can be protected in several ways. Concrete curbs and railings can be installed around tree planters to discourage foot traffi c. Where space is tight, trees can be installed in pits with steel tree grates. Subgrade conditions can be improved through the use of root paths and structural soil. Applicability Street trees should only be located after a close examination of existing utilities (above and below ground), buildings, and traffi c concerns. Existing parkway planters can be retrofi tt ed with concrete curbs or railings to direct pedestrians away from sensitive tree roots. New construction may warrant the use of tree grates, root paths, or structural soil. Parkways that are between nine and twelve 138 │ APPENDICES feet wide are good candidates for tree grates. Tree grates can also be used where a heavy fl ow of pedestrian traffi c is expected along the curb line (i.e. on-street parking locations). Where the construction of new sidewalks separates tree planters from larger green spaces, root paths or structural soils will provide bridges for growing roots. Benefi ts ■ ■ ■ ■ Standard 6 inch high concrete curbs can reduce the volume of foot traffi c across planted areas. An 18 inch high ornamental railing mounted on top of a 6 inch high concrete curb can nearly eliminate foot traffi c across planted areas. Planter pits with tree grates eliminate foot traffi c and make it possible to place trees in tight spaces. Roots can be encouraged to cross under sidewalks by placing structural soil, or root paths underneath the paved surfaces allowing trees to access water, oxygen, and nutrients from larger green spaces. Relative tree sizes. Planting guidelines for trees. IMAGE: CONSERVATION DESIGN FORUM IMAGE: CONSERVATION DESIGN FORUM
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
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Partners Baytown Channelview Deer P
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4 │ INTRODUCTION
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SAN JACINTO HISTORIC DISTRICT The S
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NATURAL HISTORY At the time of Euro
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FIRST PRINCIPLES A set of First Pri
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1. 2. 3. 4. Committed Sponsorship T
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II. Design Scenarios SAN JACINTO TE
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FREEWAY Planning and design along f
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Freeway Corridor Profi le The Corri
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Freeway intersections are of intere
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FARM TO MARKET ROADS Corridor desig
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The Corridor Profi le below present
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MAIN STREETS Main Street corridors
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Main Streets provide a broader rang
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Main Street areas lend themselves t
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LOCAL ROADS Design standards for Lo
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Local Roads are less dense and less
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COMMUNITY GATEWAYS Community Gatewa
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Community Gateways take a variety o
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As formal entryways into communitie
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PROJECT STARS SITES Design standard
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Project Stars sites occur throughou
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Project Stars sites require additio
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50 │ SCENARIOS
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DESIGN ELEMENTS Design Elements ref
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DESIGN INSPIRATION IMAGE:FAUNGG@FLI
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PLANT LISTS Non-Native* SHRUBS Pitt
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TOP 10 TREES Ilex opaca AMERICAN HO
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ICONOGRAPHY NEIGHBORHOOD PROJECT ST
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ICONOGRAPHY ICONS ■ The fi ve-poi
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LIGHTING Pedestrian Light (12’-15
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PAVERS Matrix #2088 Matrix #1914 Ma
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SITE FURNISHINGS Bike Rack ■ Indi
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FENCING Vinyl ‘Horse’ Fence ■
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FENCING Brick Column Option ■ Rep
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SIGNAGE Historic Street Signage ■
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GATEWAYS Morgan’s Point Estimated
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IV. Best Practices LA IN LI CI AM l
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LA 01 LA IN LI CI AM Design landsca
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LA 03 Whether planting along roads,
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LA 05 LA IN LI CI AM Minimize potab
Page 88 and 89: LA 07 LA IN LI CI AM Preserve exist
Page 90 and 91: LA 09 Street trees provide architec
Page 92 and 93: LA 11 LA IN LI CI AM Plant trees ap
Page 94 and 95: LA 13 LA IN LI CI AM Preserve and r
Page 97 and 98: INFRASTRUCTURE LA IN LI CI AM Our h
Page 99 and 100: Natural landforms provide visual in
Page 101 and 102: Permeable pavement used in parking
Page 103 and 104: Stormwater detention can be designe
Page 105 and 106: Native streamside buffer in a utili
Page 107: Landscaping and stormwater inlets c
Page 110 and 111: LI 01 LA IN LI CI AM Provide lighti
Page 112 and 113: LI 03 LA IN LI CI AM Incorporate li
Page 115 and 116: CIRCULATION Pedestrians and bicycli
Page 117 and 118: Curb bump outs help protect pedestr
Page 119 and 120: Separated bicycle paths are substan
Page 121: Indoor bicycle facilities. Covered
Page 124 and 125: AM 01 LA IN LI CI AM Create a netwo
Page 126 and 127: AM 03 LA IN LI CI AM Select furnish
Page 128 and 129: AM 05 LA IN LI CI AM Provide maps,
Page 130 and 131: 130 │ BEST PRACTICES
Page 133 and 134: APPENDIX A - STRATEGIES The San Jac
Page 135 and 136: Water resources can also be used as
Page 137: Cistern, overhead view. Cistern wit
Page 141 and 142: Installation of permeable pavers. P
Page 143 and 144: Volunteer installation of a parking
Page 145 and 146: Luminaires with various cutoff angl
Page 147 and 148: Caption for IMAGE shown above. High
Page 149 and 150: Accessible sidewalks with frequent
Page 151: Art, water, and landscaping work to
Page 154 and 155: VEGETATION OF THE COASTAL PRAIRIE P
Page 156 and 157: Asclepias viridifl ora GREEN MILKWE
Page 158 and 159: Solidago sempervirens SEASIDE GOLDE
Page 160 and 161: Among the woody vines were: Ampelop
Page 162 and 163: Quercus nutt allii NUTTALL’S OAK
Page 165 and 166: APPENDIX C - BIKEWAY PLANS Appendix
Page 167 and 168: KENNINGS RD BARBERS HILL RD SH 330
Page 169: SAN JACINTO TEXAS HISTORIC DISTRICT
Page 172 and 173: Tools to consider for the San Jacin
Page 174 and 175: Regulatory Tools Regulatory Tools P
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design elements - San Jacinto Texas Historic District

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