The Surface Menu allows input of residue, snow, and surface characteristics.

Snow Parameters:

Depth of Snow : Snow depth at the beginning of simulation

Temperature of Snow : Snow temperature at the beginning of simulation. Valid range: less than or equal to 0.0

Density of Snow (g/cm3) : Weight of water / Volume. Typical range: 0.10 for newly fallen snow to 0.45 for old dense snowpack.



Residue Paremeters:

Depth of Residue (cm) : Thickness of plant residue/mulch/litter layer on soil surface. Typical range: 0.5 to 5 cm.

Residue Biomass (kg/ha) : Biomass of residue/mulch/litter. Typical range: 2000 to 20,000.

Residue cover (%) : Percent of Surface Covered by Residue

valid data is 0.0 to 100.0

Residue Albedo : Fraction of total sunlight reflected by residue. Typical range: 0.15 to 0.30.

Type of Residue : Select a residue type that best approximates the size of residue elements for your system. This is used to parameterize convective transfer through the residue layer



Wind profile roughness (cm) : A measure of soil and residue surface roughness. Valid data is 0.1 to 10.0 cm, where smooth = 0.1, rough = 10.0

Maximum depth of ponding (cm) : Depth of water ponded on the surface before runoff begins. Valid data is 0 to 10 cm