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並前往https://www.swan.wa.gov.au/files/db6d0722-b4e4-4d32-8d65-9d5700ca12a7/Specification_231_-_Subsoil_and_Foundation_Drains.pdf

WESTERN AUSTRALIA SPECIFICATION 231 SUBSOIL AND ...

Subsoil drains shall discharge into gully pits and other stormwater drainage structures. Outlets shall be constructed of unslotted plastic pipe of the same ...

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