Unsaturated hydraulics

4 important questions on Unsaturated hydraulics

What is the plant available water (PAW)?

Area between field capacity and the permanent wilting point.

Name three reasons how the higher water retention (FC, PAW) of clay is caused by.

1. A greater abundance of small pores (more capillarity)
2. Much greater osmotic binding in the double-layer
3. Greater adsorptive power (high surface area)

How is the area between pF values 0 and 2.5 called?

The drainable pore space
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What is on the x and y axis of the pF curve

The X axis is the matric suction (hm). The Y axis is the volumetric soil moisture content (theta).

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