In hydrology, throughflow, a subcomponent of interflow, is the lateral unsaturated flow of water in the soil zone, where a highly permeable geologic unit overlays a less permeable geologic unit, and which returns to the surface, as return flow, prior to entering a stream or groundwater. Once water infiltrates into the soil, it is still affected by gravity and either infiltrates to the water table or travels downslope.

Throughflow within Makassar Strait
THROUGHFLOW, OVERLAND FLOW AND EROSION
The Indo‐Pacific throughflow in the Timor Passage
The role of topography in controlling throughflow generation
Measurements within the Pacific-Indian oceans throughflow region
Geostrophic transport of the Pacific‐Indian Oceans throughflow
Towards improved throughflow capability - The use of 3D viscous flow solvers in a multistage environment
Intraseasonal Variability in the Indo Pacific Throughflow and the Regions Surrounding the Indonesian Seas
Light‐enhanced convective throughflow increases oxygenation in rhizomes and rhizosphere of Phragmites australis (Cav.) Trin. ex Steud
Growth and phosphate uptake kinetics of the cyanobacterium, Cylindrospermopsis raciborskii (Cyanophyceae) in throughflow cultures