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 Drainage Board Macao, Taiwan Plastic Drainage Board Drainage Board: Alias plastic drain, with wavy, harmonica type and other shapes. Extrusion of the middle plastic core, is a drainage channel with the cytoskeleton and its cross section was parallel, double-wrapped in non-woven geotextiles for filtration layer, the core zone will play a supportive role to the water filter layer infiltrated discharged upward , is the mud, silt soil quality, such as saturated hydraulic fill filling viscous and miscellaneous drainage consolidation method using soft ground a good vertical access, greatly reducing the soft soil consolidation time.