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EFFECT OF WATER<br />
Perched water table decreases slope stability by caus<strong>in</strong>g<br />
temporary <strong>in</strong>crease <strong>in</strong> pore water pressure which reduces<br />
shear strength <strong>in</strong> the earth material.<br />
Figure from Keller (2000)<br />
Colluvial soil;<br />
relatively<br />
permeable.<br />
Bedrock;<br />
low permeability.<br />
GEOL g406 Environmental Geology S. Hughes, 2003