Under-drainage of lined canals refers to the system designed to manage water that may accumulate beneath the canal liner. While the liner prevents water from seeping through the canal bed, water can still accumulate underneath due to external factors like groundwater flow or precipitation.
Under-drainage systems typically consist of perforated pipes or gravel-filled trenches placed beneath the liner to collect and redirect this water. The system helps prevent hydrostatic pressure buildup, which can damage the liner or cause it to shift.
