Question

The phreatic line is the ________

(a) top flow line separating saturated and unsaturated zones

(b) middle flow line separating saturated and unsaturated zones

(c) bottom flow line separating saturated and unsaturated zones

(d) bottom flow line separating saturated and partially saturated zones

The question was posed to me in class test.

This is a very interesting question from Seepage Analysis topic in chapter Seepage Analysis of Geotechnical Engineering I

Answer 1

Correct answer is (a) top flow line separating saturated and unsaturated zones

Best explanation: The location and shape of phreatic line or the top flow line separating saturated and unsaturated zones is the first essential step to draw flow net.