Performance of Different Filter (Envelope) Materials in Subsurface Drainage System

The field experiment was conducted to study performance of different filter (envelope) materials in subsurface drainage (SSD) system. The results revealed that the water table decline, drain discharge, drainage coefficient and hydraulic conductivity were maximum, whereas EC and SAR of drain water were lowest in SSD system with coarse sand filter over SSD system with coarse sand + nylon sleeve and nylon sleeve alone.