The general path that a particle of water follows under laminar flow conditions. Line indicating the direction followed by groundwater toward points of discharge. Flow lines generally are considered perpendicular to equipotential lines.
he direction of flow of an imaginary particle of water.
Lines on the surface of painted sheet, brought about by incomplete levelling of the paint. The line pattern revealed by etching, which shows the direction of plastic flow on the surface or within a wrought structure.