permeabilityClass {soilassessment}

A function to determine permeability class

Description

This function determines the soil permeability classes according to the USDA soil textural classes

Usage

permeabilityClass(texture)

Arguments

texture

is a string decribing soil textural class

Details

Soil textural class is according to USDA textural triangle such as SiLo, Si, SaLo. The code is represented by first two letters of the class with the first letter in upper case, e.g., Si, Lo, Cl. Class codes with combination of textures have the first two letters included in the combination, e.g., SiLo, SaClLo, etc.

Value

permeability class code. 1-very slow, 2-slow, 3-moderately slow, 4-moderate, 5-moderately rapid, 6-rapid, and 7-very rapid

Author(s)

Christian Thine Omuto

References

O'Geen, A. T. (2013) Soil Water Dynamics. Nature Education Knowledge 4(5):9

Soil Survey Staff. Soil Taxonomy A Basic System of Soil Classification for Making and Interpreting Soil Surveys. Agricultural Handbook No. 436. U.S. Government Printing Office Washington, DC, 1999.

See Also

drainageSuit, erodFUN

Examples

library(sp)
permeabilityClass("SaLo")

texture=suitabinput["texture1"]
texture$permeability=ifelse(texture$texture1=="Lo",
permeabilityClass("Lo"),ifelse(texture$texture1=="SaLo",
permeabilityClass("SaLo"),permeabilityClass("SiLo")))
str(texture$permeability)
texture$Perm=classCode(texture$permeability,"permeability")
spplot(texture["Perm"])