Tri-planar cov khoom muaj xws li centralized nruab nrab HDPE tav uas muab channelized ntws, thiab diagonally muab tso rau sab saum toj thiab hauv qab strands uas txo geotextile intrusion.Lub void tswj cov qauv tseem ceeb muab kev sib kis ntau dua li cov khoom lag luam bi-planar.