Question

What type of points is needed to be joined to form an equipotential line?

(a) Equal Pressure Points

(b) Residual Heads which still need Energy Dissipation

(c) Velocity Gradient Points

(d) Points of intersection of Streamlines and Velocity Components

This question was posed to me in an internship interview.

The question is from Seepage Theories in portion Seepage Theories and Weirs and Barrages Design of Irrigation Engineering

Answer 1

Correct choice is (b) Residual Heads which still need Energy Dissipation

Best explanation: Streamlines enter from the upstream with some head (H), but in case of equipotential lines it is considered that in downstream side water is not present. So, even though energy dissipation takes place there will some residual head (h) will be present at certain points on the streamlines. Therefore, joining these points together forms an equipotential line.