University of Maryland Extension

Hydrologic Soil Group (HSG)

Q. When calculating the P factor in RUSLE, I noticed that at times, two Hydrologic Soil Groups (HSG) are listed in the table or the computer program. Which HSG do I use?

A. The two columns or choices of data for Hydrologic Soil Group correspond to drained and undrained conditions. If a producer has tile drains or ditch drains in a field, use the information for "drained". If there are neither tile drains nor ditch drains in a field, use the information for "undrained." (Source: Mickey Shockley, USDA, NRCS)

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