Don't you think the seepage will be related to water saturation and matric suction is already related to the water saturation/content? So you can correlate indirectly.
Dear Mohammad,
I think there is no relation between metric suction and seepage line during steady state because seepage phenomenon is related to free water between soil particles not the bonded water film around the particles.
May be there is relation during transit state, when the water is still filling the voids between dry particles, but it will be mixed with capillary phenomenon and it is difficult to be studied separately
regards
Matric suction is in general related to soil particles and their (soil's) permeability, whether saturated or unsaturated. For saturated soils, permeability may be considered as unity. Nonetheless, for unsaturated soils, permeability may be varying in its extent and is related to pore water pressure. Seepage in soil would be depending upon soil's own infiltration capacity/ permeability and would cause pore water pressure development. Therefore, seepage may probably be indirectly related to matric suction of a soil, particularly in case of unsaturated soils.
Regards.
AK
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