Design Standard of Common Duct Article 8
Cover depth in-between the upper part of top slab of main duct and road paving shall not be less than two hundred and fifty (250) cm for standard section, one hundred (100) cm for non-typical section.
中文原文 共同管道工程設計標準第8條
幹管頂版上緣至道路舖面間之覆土厚度，在標準部不得小於二百五十公分，在特殊部不得小於一百公分。