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

What is it exactly?

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...