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

Subsoil Drains - TYPICAL STANDARD DETAILS

TYPICAL LAYOUT OF SUBSURFACE DRAINAGE. SCALE 1 : 200 ... SUBSOIL DRAINAGE WITH POLYETHYLENE LINING ... WHERE THE SUBSURFACE DRAINS ARE PLACED IN SOLID ROCK.

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