09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal...
Transcript of 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal...
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Hydraulic Conductivity
Chapter 6
Bernouli’s Equation
piezometer
∆hydraulic gradient
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Flow Regimes
1
kDarcy’s
Law
Seepage Velocity
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Seepage Velocity
1
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Hydraulic Conductivity
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Hydraulic Conductivity
Degree ofSaturation
Absolute Permeability
Absolute Permeability(Soil Property Only)
Hydraulic Conductivity(Soil / Water Property)
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Source: www.ce.texas.edu
Viscosity of Water
Source: www.ce.texas.edu
Density of Water
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Hydraulic Conductivity
Soil PropertySoil / Water Property
Hydraulic Conductivity
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Constant Head Test
Falling Head Test
2.303 log
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Example
1
Example
2.303 log
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Example
→
Source: www.ce.texas.edu
Density of Water
25C
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Well Pumping
Well Pumping
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Example
A 200‐mm‐diameter well that fully penetrates a25‐m‐thick confined aquifer is pumped at a rateof 2000 m3/day. The drawdown in an observationwell 100 m away is 1.4 m and the drawdown inan observation well 50 m away is 4 m. What isthe horizontal permeability of the aquifer?
Drawdown
h0 h
s
q
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Example
What would be the horizontal permeability ofthe aquifer if it was unconfined instead? Assumethe static water level in the aquifer is 100 mabove the impervious layer.
Drawdown
h0 = 100 mh
s
q