無孔就不用襪子啦(filter fabric). 有孔的話我多會用來防止以後沙土吸附管子堵住小孔。要雨後地幹點再幹啊。
回答: 你的情況用3寸無孔就可以了。除非你有積水需要在從French drain到outfall的一路上都需一些排水。小孔是來進水的。無
由 btx2012
於 2012-07-19 06:39:50
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