The 'flow net' for seepage analysis consists of:
Choose the correct answer
Only equipotential lines
Flow lines + equipotential lines forming curvilinear squares (90° intersections) — q = kH×Nf/Nd per unit width
Only velocity vectors
Pressure distribution diagram alone
Correct Answer
B. Flow lines + equipotential lines forming curvilinear squares (90° intersections) — q = kH×Nf/Nd per unit width
Why is this the answer?
Flow net: graphical solution to Laplace equation (∇²h = 0) for potential flow. Consists of: (1) Flow lines (stream lines — paths of water particle); (2) Equipotential lines (lines of equal head). Properties: flow lines and equipotential lines intersect at RIGHT ANGLES (conformal mapping). Curvilinear squares (a = b) for uniform q. q = kH × Nf/Nd per unit width where Nf = flow channels, Nd = equipotential drops.
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