The Prefabricated horizontal drainage(SBD) material that discharges water out of the improved area as a replacement for the sand blanket.


PropertiesUnitSpecificationTest Method
DimensionThicknessmm8.0 ± 1.5
Widthmm300 ± 10
DrainCompression strengthkN/m2> 250
Discharge Capacity at straight 100kPa, I = 1.0m3/day> 36ASTM D4716
FilterGrab StrengthN> 500ASTM D4632
Permeabilitym/s> 1.0×10-4ASTM D4491
Apparent Opening Size, O90micron< 75ASTM D4751
* Revision might be made without notice