Van Genuchten Soil Water Retention Calculator
Soil physics & vadose zone hydrology: Calculate soil water retention ($\theta(h)$), effective saturation ($S_e$), differential water capacity ($C(h)$), and Mualem unsaturated hydraulic conductivity ($K(h)$).
Soil Textural Class & Parameters
100 cm ≈ 10 kPa ≈ pF 2.0 (Field Capacity)
Moisture Content & Unsaturated Conductivity
Volumetric Water θ(h):
--
cm³ / cm³ (moisture content)
Unsaturated K(h):
--
cm / day (Mualem)
Effective Saturation:
--
S_e (fraction)
Specific Capacity:
--
cm⁻¹ (dθ/dh)
Soil pF Value:
--
log₁₀(|h|)
Agricultural Hydrology Metrics
Relative Permeability K_r(h):
--
Air Entry Value (1 / α):
-- cm
Soil Moisture Zone:
--
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