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Curve number for hydrologic soil group A
Curve number for hydrologic soil group B
Curve number for hydrologic soil group C
Curve number for hydrologic soil group D
This file lists typical Curve Number values for different land use types.
The SCS curve number is a function of the soil’s permeability, land use and antecedent soil water conditions. Typical curve numbers for moisture condition II are listed in the following tables for various land covers and soil types (SCS Engineering Division, 1986). These values are appropriate for a 5% slope.
| Field | Description | Type | Unit | Default | Range |
|---|---|---|---|---|---|
SCS Engineering Division, 1986
Curve Number class name
string
n/a
n/a
n/a
Curve Number for Hydrologic Soil Group A
real
none
Varies by land use
30.0-100.0
Curve Number for Hydrologic Soil Group B
real
none
Varies by land use
30.0-100.0
Curve Number for Hydrologic Soil Group C
real
none
Varies by land use
30.0-100.0
Curve Number for Hydrologic Soil Group D
real
none
Varies by land use
30.0-100.0
Curve Number class name
The name of the Curve Number class is a primary key referenced by cn2 in landuse.lum. All names in the cntable.lum file must be unique.
The name describes the land use type, treatment, and cover condition the Curve Number Values are valid for.
| Name | Land use type | Treatment | Cover condition |
|---|---|---|---|
fal_bare
Fallow
Bare soil
fal_res_p
Fallow
Crop residue
Poor
fal_res_g
Fallow
Crop residue
Good
rc_strow_p
Row Crops
Straight row
Poor
rc_strow_g
Row Crops
Straight row
Good
rc_strowres_p
Row Crops
Straight row with residue
Poor
rc_strowres_g
Row Crops
Straight row with residue
Good
rc_cont_p
Row Crops
Contoured
Poor
rc_cont_g
Row Crops
Contoured
Good
rc_contres_p
Row Crops
Contoured with residue
Poor
rc_contres_g
Row Crops
Contoured with residue
Good
rc_contter_p
Row Crops
Contoured and terraced
Poor
rc_contter_g
Row Crops
Contoured and terraced
Good
rc_conterres_p
Row Crops
Contoured and terraced with residue
Poor
rc_conterres_g
Row Crops
Contoured and terraced with residue
Good
sg_strow_p
Small Grains
Straight row
Poor
sg_strow_g
Small Grains
Straight row
Good
sg_strowres_p
Small Grains
Straight row with residue
Poor
sg_strowres_g
Small Grains
Straight row with residue
Good
sg_cont_p
Small Grains
Contoured
Poor
sg_cont_g
Small Grains
Contoured
Good
sg_contres_p
Small Grains
Contoured with residue
Poor
sg_contres_g
Small Grains
Contoured with residue
Good
sg_contter_p
Small Grains
Contoured and terraced
Poor
sg_contter_g
Small Grains
Contoured and terraced
Good
sg_conterres_p
Small Grains
Contoured and terraced with residue
Poor
sg_conterres_g
Small Grains
Contoured and terraced with residue
Good
legr_strow_p
Close-seeded or Broadcast Legumes or Rotation
Straight row
Poor
legr_strow_g
Close-seeded or Broadcast Legumes or Rotation
Straight row
Good
legr_cont_p
Close-seeded or Broadcast Legumes or Rotation
Contoured
Poor
legr_cont_g
Close-seeded or Broadcast Legumes or Rotation
Contoured
Good
legr_contter_p
Close-seeded or Broadcast Legumes or Rotation
Contoured and terraced
Poor
legr_contter_g
Close-seeded or Broadcast Legumes or Rotation
Contoured and terraced
Good
pastg_p
Pasture, grassland, or range
---
Poor
pastg_f
Pasture, grassland, or range
---
Fair
pastg_g
Pasture, grassland, or range
---
Good
pasth
Meadow or continuous grass, no grazing, mowed for hay
---
---
brush_p
Brush-weed-grass mixture with brush the major element
---
Poor
brush_f
Brush-weed-grass mixture with brush the major element
---
Fair
brush_g
Brush-weed-grass mixture with brush the major element
---
Good
woodgr_p
Woods-grass combination (orchard or tree farm)
---
Poor
woodgr_f
Woods-grass combination (orchard or tree farm)
---
Fair
woodgr_g
Woods-grass combination (orchard or tree farm)
---
Good
wood_p
Forest
---
Poor
wood_f
Forest
---
Fair
wood_g
Forest
---
Good
farm
Farmsteads (buildings, lanes, driveways, and surrounding lots)
---
---
open_p
Open spaces (lawns, parks, golf courses, cemeteries, etc.)
---
Poor
urban
Paved parking lots, roofs, driveways, etc. (excl. right-of-way)
---
---
paveroad
Paved streets and roads, open ditches (incl. right-of-way)
---
---
gravroad
Gravel streets and roads (incl. right-of-way)
---
---
dirtroad
Dirt streets and roads (incl. right-of-way)
---
---