Tree Protection Area

Storm Water Management

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Circular Depression

Planted Storm Water Buffer

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Above Ground Cistern

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Preserved Wetland

Tree Protection Area

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Parking Lot Detention

Vegetated Ditch

Tree Protection Area

Trees may consume hundreds of gallons of water during certain weather periods and therefore become natural storm water BMP’s. Tree protection areas (TPA) protect critical root zones (CRZ) on special protected trees. Preserving complete tree biology is an important sustainability principle that all landscape codes should recognize.

Tree protection areas (TPA) are small habitat preservation areas that are set aside an area around the trunk of a tree to be preserved on a development site. The purpose of the TPA is to protect the critical root zone (CRZ) of the tree and to prevent damage or interference during construction. This area is established in several ways including tree size, diameter of the crown, diameter of the tree at DBH, and location of the feeder roots where most of the water and plant nutrients are taken up by the tree.

Calculations

The Tree Protection Area includes preservation of a specimen tree, as well as setting contract limit line, and tree protection barriers.

Specimen tree

TPA Area 4354 Square Feet

TPA Perimeter 253 Linear Feet

Total TPA

TPA Area 20775 Square Feet

TPA Perimeter 1452 Linear Feet

General Design Standards for Tree Protection Area

Tree protection areas may be designed as a micro storm water management facility only if the existing tree or tree grove consist of mid age to mature species of native wetland plants that will survive periodic flooding of no more than three (3) inches of water that stands for not longer than three (3) days. Soils in the area of a TPA should be sandy or sandy loam soils capable of a rapid percolating water at a rate measured in minutes/ inches.

Facility shall be calculated based upon distance to trunk caliper inch. The TPA should be established in one or two ways. Distance method shall be one food of diameter for each caliper inch of trunk at DBH or, Located at the drip line of the tree or grove of trees. Area may be measured as A= R x R x 3.14. Depth of TPA shall be forty-eight inches. The TPA shall ascend from the location of the TPA to a height of twelve (12) inches above the tree or trees.

Maintain facility from time to time by removing collected solid waste that may collect in the infiltration area of the TPA.

Click Here for more Technical Standards

Buck Abbey

309 Design Building

Baton Rouge, LA 70803

(O) 225.578.1475

(F) 225.578.1445

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