Here is a summary of the key points from the provided article:

Hydraulic Properties
- The hydraulic conductivity (k_i) and soil matric potential (ψ_i) for each soil layer vary with volumetric soil water (θ_i) and soil texture.
- Hydraulic properties are a weighted combination of mineral and organic soil properties.
- Hydraulic conductivity is calculated based on saturated hydraulic conductivity (k_sat), liquid soil moisture, and an ice impedance factor (Θ_ice).
- Soil porosity (θ_sat,i) is calculated as a weighted average of mineral and organic matter porosity.
- The exponent B_i is also calculated as a weighted average between mineral and organic matter values.
- Soil matric potential (ψ_i) is defined at the node depth of each layer and depends on the saturated soil matric potential.

Saturated Hydraulic Conductivity
- Organic soils can have saturated hydraulic conductivity 2-3 orders of magnitude higher than mineral soils.
- To account for this, the organic matter fraction is divided into "connected" (f_perc) and "unconnected" (f_uncon) fractions.
- For the unconnected fraction, k_sat is calculated as a series flow through mineral and organic components.
- The bulk soil layer k_sat is then computed as a weighted average of the connected and unconnected fractions.
- Organic matter properties (θ_sat,om, B_om, ψ_sat,om, k_sat,om) are defined with depth-dependent functions.