... or burst. FeaturesMaterial: HDPE, PPSpecification: Drainage Board 50*50cm; Drainage Cage 50*50*46cmColor: Black, orangeWater ... .Social Project:ground water and surface water drainage in roadbed, tunnel underground and waste landfill ... drainage in building foundation, basement, roof, and lagging.Virescence use:used in Garage roof Virescence, roof garden, court and bathhouse, etc drainage cell ...