09 - hydraulic conductivity for students/09... · 2/25/2015 12 example what would be the horizontal...

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2/25/2015 1 Hydraulic Conductivity Chapter 6 Bernouli’s Equation piezometer ܮ hydraulic gradient

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Page 1: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

2/25/2015

1

Hydraulic Conductivity

Chapter 6

Bernouli’s Equation

piezometer

∆hydraulic gradient

Page 2: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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2

Flow Regimes

1

kDarcy’s

Law

Seepage Velocity

Page 3: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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3

Seepage Velocity

1

1

Hydraulic Conductivity

Page 4: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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4

Hydraulic Conductivity

Degree ofSaturation

Absolute Permeability

Absolute Permeability(Soil Property Only)

Hydraulic Conductivity(Soil / Water Property)

Page 5: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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5

Source: www.ce.texas.edu

Viscosity of Water

Source: www.ce.texas.edu

Density of Water

Page 6: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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6

Hydraulic Conductivity

Soil PropertySoil / Water Property

Hydraulic Conductivity

Page 7: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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7

Constant Head Test

Falling Head Test

2.303 log

Page 8: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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8

Example

Example

2.303 log

Page 9: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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9

Example

Source: www.ce.texas.edu

Density of Water

25C

Page 10: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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Well Pumping

Well Pumping

Page 11: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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11

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

Page 12: 09 - Hydraulic Conductivity for Students/09... · 2/25/2015 12 Example What would be the horizontal permeability of the aquifer if it was unconfined instead? Assume the static water

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12

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