The spacing of tile drains to relive logged land is directly
ADepth of drains below the ground surface
BCoefficient of permeability of the soil to be drained
CDepth of impervious from the drain
DDepth of drain below the water level
ADepth of drains below the ground surface
BCoefficient of permeability of the soil to be drained
CDepth of impervious from the drain
DDepth of drain below the water level
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