How do horizontal drains help to stabilize slopes?

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The use of horizontal drains to enhance slope stability in the following ways:

(i) It enhances an increase in soil strength by lowering the degree of saturation of soils.

(ii) It reduces the pore water pressure in the region of potential slip surface.


(iii) It hinders the development of seepage forces.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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