Why should flow lines and equipotential lines cross each other at right/angles?
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since flow cannot cross impermeable boundaries, the flow at such a boundary must be parallel to it, i.e., impermeable boundaries are flow lines, and equipotentials must meet them at right angles. c. the water table is, by definition, the surface where P = 0; it can thus be an equipotential only if it is horizontal.
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since flow cannot cross impermeable boundaries, the flow at such a boundary must be parallel to it
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