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W. Vlotman ; S. Rehman ; M. Bhutta ; INTERNATIONAL WATERLOGGING AND SALINITY RESEARCH INSTITUTE PAK ; International Winter Meeting ASAE, Nashville, USA, 15-18 December 1992 (1992) | St Joseph, USA : ASAE | Paper n° 922649 | 1992Construction of subsurface drainage systems in Pakistan have taken place at three locations since 1971. At all three locations, granular envelopes have been, and are used as a surround for the perforated PVC subsurface drain pipe. Either USBR, S[...]
