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Flow Nets

describing different groundwater flow systems

QuestionAnswer
flowlines indicate the path a water particle will follow as it moves
equipotential lines contour lines of equal hydraulic head in the subsurface; they intersect streamlines; h is constant along the lines
what are the boundary condidtions of flow nets in homogeneous, isotropic systems? impermeable, constant head, water table
Impermeable Boundaries equipotential lines are perpendicular and flow lines are parallel to impermeable boundaries
Constant Head Boundaries equipotential lines are parallel and flow lines are perpendicular to constant head boundaries
Water Table Boundaries h = z since pressure head, ψ = 0 If there is recharge or discharge, the water table is neither a flow line nor an equipotential line. If no recharge, then water table is a flow line.
what happens to the flow net in heterogeneous systems? flowlines & equipotentials will refract when they cross permeability boundaries GW takes path of least resistance by travelling a shorter path through the low-K material
What is the rule of thumb for GW flow? Groundwater flow is horizontal in higher K layers and vertical in lower K layers
Effects of anisotropy on flow nets Flow lines & equipoentials will not be orthogonal
Created by: 700827381589447
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