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Agricultural Sciences
Soil Science
1980
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Van Genuchten Soil Water Retention

Se=[1+(α∣h∣)n]−mS_e = \left[1 + (\alpha |h|)^n\right]^{-m}

Relates soil water content to matric potential—how soil holds and releases water.

By Martinus van Genuchten

Agricultural Sciences
Van Genuchten Soil Water Retention
1980 · Martinus van Genuchten
Why it matters: Essential for irrigation, drainage, and contaminant transport modeling.

Discoverers: Martinus van Genuchten (1980)

What does it mean?

Relates soil water content to matric potential—how soil holds and releases water.

Why should I care?

Essential for irrigation, drainage, and contaminant transport modeling.

Variables & Units

SymbolNameUnitMeaning
SeS_eEffective saturation—0 to 1
hhPressure head—cm or m
α,n,mα,n,mParameters—Soil-specific fitting parameters

Worked Example

Sandy soil: low water retention; clay: high retention.

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Sources & further reading

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Equation Universe

Van Genuchten Soil Water Retention

Se=[1+(α∣h∣)n]−mS_e = \left[1 + (\alpha |h|)^n\right]^{-m}

Real-world impact

Precision agriculture

Equations optimize food production for billions.

Photo: Unsplash — precision farming

Relates soil water content to matric potential—how soil holds and releases water.

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