The overland flow Manning's n class name is a primary key referenced by ov_mann in landuse.lum. All names in the ovn_table.lum file must be unique.
Name
Land use/tillage type
Treatment
fallow_nores
Fallow
No residue
convtill_nores
Conventional tillage
No residue
convtill_res
Conventional tillage
Residue
chisplow_nores
Chisel plow
No residue
chisplow_res
Chisel plow
Residue
falldisk_res
Fall disking
Residue
notill_nores
No tillage
No residue
notill_0.5-1res
No tillage
0.5-1 t/ha residue
notill_2-9res
No tillage
2-9 t/ha residue
range_sparse
Rangeland with sparse cover
---
range_20cover
Rangeland with 20% cover
---
shortgrass
Short grass prairie
---
densegrass
Dense grass
---
bermudagrass
Bermudagrass
---
forest_light
Light forest
---
forest_med
Medium forest
---
forest_heavy
Heavy forest
---
urban_asphalt
Urban area with asphalt
---
urban_concrete
Urban area with concrete
---
urban_rubble
Urban area with rubble
---
ovn_mean
Mean overland flow Manning’s n value
This is the value that is used by the model. The ovn_minandovn_max values are included in the file to help users stay within reasonable ranges during calibration.
ovn_min
Overland flow Manning's N minimum
This value is not used by the model. It is included in the file to help users stay within reasonable ranges during calibration.
ovn_max
Overland flow Manning's N maximum
This value is not used by the model. It is included in the file to help users stay within reasonable ranges during calibration.
ovn_table.lum
This file lists overland Manning's n values for different tillage and land cover types.