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並前往https://www.tshwane.gov.za/sites/residents/Services/Documents/STD022_sh1of1.pdf

TYPICAL STANDARD DETAILS - City of Tshwane

TYPICAL LAYOUT OF SUBSURFACE DRAINAGE ... SUBSOIL DRAINAGE WITH POLYETHYLENE LINING. SCALE 1:20 ... PIPE DIAMETER + 200mm, PROVIDED THAT THE SECTIONAL AREA.

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