The filter material should be ___________ enough to prevent buildup of seepage forces within the filter.
(a) Coarse and Pervious
(b) Finer
(c) None of the mentioned
(d) All of the mentioned
I have been asked this question by my college professor while I was bunking the class.
The origin of the question is Protective Filters in section Drainage and Dewatering of Geotechnical Engineering I