Does anyone know a way to convert the World Reference Base for Soil Resources classification to the hydrological soil group? In particular I would need a conversion table to SWAT soil classification
Dear Giulio,
What attributes do you need in the SWAT soil classification?
Dear Jerome,
Thanks for your answer
I am trying to have a conversion table for all the possible needs, but I mainly need the hydrological soil group
The hydrologic soil group is a parameter for classifying soils according to their hydrological features http://directives.sc.egov.usda.gov/OpenNonWebContent.aspx?content=17757.wba.
It is used for the Curve Number Rainfall-Runoff https://en.wikipedia.org/wiki/Runoff_curve_number
The only way is to go trough the WRB soil classes and extract from the qualifier list the textural classe. Indeed in WRB, you will have the Reference Soil Group like Cambisol, Podzol. The latter are followed by qualifier expressing special features like the soil texture (clayic, siltic, arenic qualifiers).
Convert the limit textural class of your Hydrological Soil Group with the soil textural calculator (see attached) and try to find those limits according to WRB qualifier to build a conversion table.
A rough conversion (I guess, to be verified )will be :
Group A ->Arenic qualifier
Group B-> Loamic qualifier
Group C -> Siltic qualifer
Group D -> Clayic qualifier
http://www.fao.org/3/a-i3794e.pdf
http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/?cid=nrcs142p2_054167
Dear Castelli
You Need to know the hydrological behavior of the soil to determine the soil group.
Dear all,
thanks a lot for your answers. I don't think to have sufficient information to determine the HSG. I attach here the attribute table that I have.
I don't have any information about the soil texture...
Regosols are "young"soils from unconsolidated sediment, common in arid areas and moutains.
You can extract some information from the qualifiers, see below:
Calcaric --> ≥ 2% calcium carbonate between 20 cm and 1m from the soil surface
Skeletic --> more than 40% of rock fragements like gravel, stones over a depth of 1 mfromn the soil surface to the bedock
Leptic--> bedrock starting within 1 m
Arenic --> having a texture class of sand or loamy sand in a layer ≥ 30 cm thick, within 1 m
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