Herbs that Drain Dampness

Besides promoting urination to drain dampness, what is another important function of Han Fang Ji (stephaniae tetrandrae radix)?

Some books actually put Han Fang Ji in the category "Herbs that Dispel Wind-Dampness" because of its ability to treat bi syndrome.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. p. 313 [Q821]