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.
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(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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