Question

The slope of discharge face can exceed _______

(a) 30°

(b) 45°

(c) 60°

(d) 90°

The question was asked by my college professor while I was bunking the class.

My query is from Seepage Analysis topic in portion Seepage Analysis of Geotechnical Engineering I

Answer 1

The correct option is (d) 90°

For explanation I would say: The slope α of discharge face can even exceed 90°. This can be the case of rock -fill toe. The correction \(\frac{\Delta a}{1+\Delta a}\) for 90° is given by Casagrande as 0.26.