This book encompasses Germann’s multidecade pursuit of a more realistic representation of water flow in soils than generally accepted theory provides. It is an unusual example of a type of publication needed for making progress on a topic like preferential flow, where current understanding is limited, diverse directions of research are prominent, and the scientific community has not yet settled on an accepted approach.

The book’s important contribution is the explication of a basis in theory and observation for important ideas that advance the understanding and quantification of preferential flow and that are not in mainstream unsaturated-flow textbooks. This material—concerning...

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