管涌形成主要受控于堤基土体结构、土的物理力学性质和洪水位，经过不断改进的减压井等工程措施对防止管涌是有效的。
The formation of piping is controlled by the structure, physical and mechanical properties of the soil for the base of dike and flood level.
申请书须于截止申请日期或之前送达下列查询地址(九龙土瓜湾福祥街1号马头涌官立小学)。
Application should reach the following enquiry address (ma Tau Chung Government Primary School, 1 Fuk Cheung Street, Tokwawan, Kowloon.) on or before the closing date for application.
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