Introduction Specimen Code Picture Gallery Links

 

 
Developed Open Space
Street Tree Planting Area
Street Yard
Buffer Yard
Vehicular Use Area (VUA)
VUA Interior
VUA Screen
VUA Detention
Street Wall & Foundation Planting
Tree Protection Area
Secondary Business Elevation
Landscape Screen
 
 
 
 
 
 
 

 

Tree & Habitat Protection Area

Community tree preservation ordinances are written across the country to restrict the removal of trees and the protection of native habitats. Other ordinances are being written to protect stream banks, wetlands, steep slopes, wildlife scenic views and other unique natural resources. Sensitive resources must be protected by the action of land development if they are deemed important to quality of life.

An HPA can be used to save important groves of trees on development sites. Saving a grove is actually a better water quality improvement strategy since a grove will allow the infiltration and uptake of even more site storm water. But in addition, saving a small patch of native landscape on a development site offers even more environmental values including enhanced aesthetics, wildlife habitat, visual privacy and collections of native species and their seed crop. In addition, the concept of a defined HPA can be used to protect and preserve any unique site feature including steep slopes, ground water recharge areas, bed rock outcrops, significant wildlife habitat or climate modulators for sun, wind snow and energy conservation.

 

Calculations

Planting Area

Diameter at Breast Height (DBH)= standard measure of tree size by trunk diameter at four and a half (4.5) feet above ground level.

 

Total DBH is the sum of each trees DBH on-site.

 

Percentage of DBH Retained= DBH Post-construction/ DBH Pre-construction

 

TPA is measured from the trunk location to a perfect radius distance ten (10) feet beyond the furthest drip line of the individual tree, or it is measured as one (1) foot of linear distance away from the trunk for each caliper inch of tree at breast height. During construction, all reasonable steps necessary to prevent the destruction or damaging of critical root zones shall be taken. No excess soil, additional fill, equipment, liquids, or construction debris shall be placed within the drip line of any protected tree or tree grove. Protective barriers constructed of wood or chain linked fence shall be installed for the duration of the construction process phase.

 

 

General Design Standards for TPA & HPA

Tree protection areas (TPA) protect critical root zones (CRZ) on individual and special protected trees. Habitat Protection Areas (HPA) are large tree protection areas in which a complete habitat of plants, soils, water regimes, animal life and nutrients work together to produce clean air, pure water, rich soils, and a population of animal life living and growing off of the biological productivity and diversity of the place. Preserving complete tree ecologies is an important sustainability principle that all landscape codes should recognize.

A well written landscape code will use TPAs and HPAs to protect trees, preserve habitat and improve water quality. There fore, tree preservation areas are being seen as landscape design components in which trees and habitats are being preserved as an integral part of a site plan

 

Click Here for more Technical Standards

 

 

Buck Abbey

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