Question

The exit gradient can be expressed by which of the following expression?

(a) ie = Δ h/i

(b) ie = Δ h.i

(c) ie = l/h

(d) ie = h/i

The question was posed to me at a job interview.

This question is from Seepage Analysis in division Seepage Analysis of Geotechnical Engineering I

Answer 1

Right choice is (a) ie = Δ h/i

The best explanation: ie =Δ h /l, represent gradient formula where Δ h=potential drop and l is the average of last field in the flow net at the exit end.