6 Permeability - Flow of Water Through Soils A ball on a...

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1 Flow of Water Through Soils A ball on a Hill Ball on top of hill will not move if surface flat (horizontal) Ball on slope will roll down hill Movement of ball due to gravity requires a change in slope or a gradient Mg Mg
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2 Water also flows downhill Soil Soil can be considered to consist of di t ti l ( lid ) discrete particles (solids) The voids or pore space between the particles are all interconnected If the voids are full of water (Sr=1 or 100%) water will flow from regions of 100%) water will flow from regions of higher to lower pressure
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3 Partially Water Saturated Soils Soils voids are filled with water and air S 1 100% Sr<1 or 100% Water Saturated Soils Soils voids are 100 percent filled with t water
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4 Positive Porewater Pressure + acts normal to soil particles and is equal in all directions • pushes soil grains apart resulting in a decrease in soil particle to particle contact + + Negative Porewater Pressure + acts normal to soil particles and is equal in all directions • pulls soil grains together resulting in an increase in soil particle to particle contact - -
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