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Handout6 - 0 E O W.U II(0 r"" CD C)CD O'l.S N •...

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TABLE 7.1 TYPICAL VALUES OF HYDRAULIC CONDUCTIVITY, k, FOR SATURATED SOILS Hydraulic Conductivity, k Soil Description (cmls) (ftls) Clean gravel 1 to 100 3xl0- 2 to 3 Sand-gravel mixtures 10- 2 to 10 3x 1 0-4 to 0.3 CJean coarse sand 10- 2 to 1 3x10-4 to 3xlO- 2 Fine sand 10- 3 to 10- 1 3xIO- s to 3xlO· 3 Silty sand 10. 3 to 10. 2 3xlO- S to 3xlO-4 Clayey sand 10- 4 to 10- 2 3xlO- 6 to 3xl0-4 Sih 10-g to 10- 3 3xl0- JO to 3xl0' s Clay 10. 10 to 10- 6 3xIO, '2 to 3x10· g
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L Constant Head Permeability Test h = constant Q, t Porous stone Hydraulic gradient, i = H L k=~= alt _ aL q=kiA iA (H/L)A HAt
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L Falling Head Permeability Test Small dia. tube cross-sectional area, a Porous stone Sample cross- sectional area, A
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EXAHPLE:
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