Question

Which of the following zone in Zoned type embankment prevents piping through cracks?

(a) Central core

(b) Transition zone

(c) Outer zone

(d) Core wall

I had been asked this question in an interview.

I need to ask this question from Types of Earthen Dams in portion Earthen and Rock Fill Dams of Irrigation Engineering

Answer 1

Correct option is (b) Transition zone

The explanation is: The outer zone is made of fairly pervious material like grit, gravel, and murrum. The innermost zone is done with fairly impervious material. The central core is covered by comparatively pervious transition zone which prevents piping through the cracks which may develop in the core.