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 Drainage board; drainage board is made of polystyrene (HIPS) or polyethylene (HDPE) plastic plate made of cone penetration through the stamping station (or hollow cylindrical porous) made the top cone penetration Taiwan bonding a layer of filter geotextile to prevent soil particles through, in order to avoid blocking drainage channels, drainage channels so smooth. The traditional use of brick tile drainage as a guide filter layer, the use of more pebbles or gravel as a treatment layer, the water discharged to the designated place. And now replaced with a drain layer to drain the water treatment cobblestone save time, effort and energy saving investment, but also reduce the building load. A good drainage system for the construction of civil structures of the normal cycle and use and has an important role in life. YS-type drain with porous tubes of an effective drainage system sparse, long and short cylindrical drain with geotextile is composed of a drainage system, thus forming a water seepage, water and drainage systems. Drainage Board Application: garden: garage roof greening, roof garden, football, golf, beach municipal engineering projects: road embankment, subway tunnel construction: the upper or lower building foundations, basements and external walls, roof and impervious insulation layer traffic engineering: highway, railway embankment, dams and slope protection layer PSb20 performance and application PSb20 drain is high impact polystyrene (HIPS) is made. Surface coupled with a layer of non-woven to form a composite drainage board. YS-PSb20 drain boss on one side, only the drainage function, compared with PSb20, PSb20 the displacement greater. For soil water holding capacity of more deep and does not require a large square green, garage, roof greening projects.