Vegetative Filtering SystemsConstruction Specifications (con’t)

Parameter Specification Size

Pea Gravel Diaphragm ATSM D-448 size no. 6 1/8”-3/8”

and curtain drain

Underdrain gravel AASHTO M-43 1/2” - 1”

PVC Piping AASHTO M-278 6” rigid

schedule 40

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