# Soil Water

Set II Soil Water

Gravitational potential is determined by the height of the points above the reference level.

Capillary or matric potential must be measured and, therefore, is provided.

Total potential energy is simply the sum of the component potentials.

Water flows from higher energy to lower energy.

The Gradient is determined by the _______ between the two points divided by the _____ between the points.

Multiplying the gradient by the hydraulic conductivity yields the total flow.

1. Soil water potentials:

100 cm

75 cm

50 cm

25 cm

0 cm

Note the soil diagram above. Point A is at 75 cm; point B is at 25 cm above the reference.

The capillary potential energy at point A is -100 cm.

The capillary potential energy at point B is -200 cm.

What is the total potential energy at point A? ______

What is the total potential energy at point B? ________

Will water flow between the points? _____ ___________________________

If so, in what direction? ____ _________

What is the gradient between the two points? ____ _______

If K = 10 cm/hr, determine the flow, Q between the points. __ __

2. Soil Water potential:

400 cm

300 cm

200 cm

100 cm

Note the soil diagram above. Point A is at 300 cm; point B is at 100 cm.

The capillary potential energy at point A is -400 cm.

The capillary potential energy at point B is -300 cm.

Note the reference level on the Figure

What is the gravitational potential energy at point B? _____________

What is the height of point A above the reference level? _________

What is the gravitational potential energy at point A? ___________

What is the total potential energy at point A? ___ ____

What is the total potential energy at point B? ______________

Will water flow between the points? _____ _______________________

If so, in what direction? _____ _____

What is the gradient between the two points? _ ____

If K = 5 cm/hr, determine the flow, Q between the points.

3. Soil Water potential:

400 cm

A

B Reference

300 cm

200 cm

100 cm

10 cm 20 cm

Note the soil diagram above. Points A and B are at 300 cm.

The capillary potential energy at point A is -200 cm

The capillary potential energy at point B is -100 cm.

Note the reference level for gravitational Potential.

Will water flow between the points? ________

If so, in what direction? __

What is the difference in total potential energy between the points? _

What is the gradient between the two points?____

If K = 10 cm/hr, determine the flow, Q between the points. _

Gravitational potential is determined by the height of the points above the reference level.

Capillary or matric potential must be measured and, therefore, is provided.

Total potential energy is simply the sum of the component potentials.

Water flows from higher energy to lower energy.

The Gradient is determined by the _______ between the two points divided by the _____ between the points.

Multiplying the gradient by the hydraulic conductivity yields the total flow.

1. Soil water potentials:

100 cm

75 cm

50 cm

25 cm

0 cm

Note the soil diagram above. Point A is at 75 cm; point B is at 25 cm above the reference.

The capillary potential energy at point A is -100 cm.

The capillary potential energy at point B is -200 cm.

What is the total potential energy at point A? ______

What is the total potential energy at point B? ________

Will water flow between the points? _____ ___________________________

If so, in what direction? ____ _________

What is the gradient between the two points? ____ _______

If K = 10 cm/hr, determine the flow, Q between the points. __ __

2. Soil Water potential:

400 cm

300 cm

200 cm

100 cm

Note the soil diagram above. Point A is at 300 cm; point B is at 100 cm.

The capillary potential energy at point A is -400 cm.

The capillary potential energy at point B is -300 cm.

Note the reference level on the Figure

What is the gravitational potential energy at point B? _____________

What is the height of point A above the reference level? _________

What is the gravitational potential energy at point A? ___________

What is the total potential energy at point A? ___ ____

What is the total potential energy at point B? ______________

Will water flow between the points? _____ _______________________

If so, in what direction? _____ _____

What is the gradient between the two points? _ ____

If K = 5 cm/hr, determine the flow, Q between the points.

3. Soil Water potential:

400 cm

A

B Reference

300 cm

200 cm

100 cm

10 cm 20 cm

Note the soil diagram above. Points A and B are at 300 cm.

The capillary potential energy at point A is -200 cm

The capillary potential energy at point B is -100 cm.

Note the reference level for gravitational Potential.

Will water flow between the points? ________

If so, in what direction? __

What is the difference in total potential energy between the points? _

What is the gradient between the two points?____

If K = 10 cm/hr, determine the flow, Q between the points. _

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