Since even rapidly growing, finely branched root systems rarely contact more than 1 or 2% of the soil particle surfaces, how is it that the roots can utilize much more than 1 or 2% of the water held...

Since even rapidly growing, finely branched root systems rarely contact more than 1 or 2% of the soil particle surfaces, how is it that the roots can utilize much more than 1 or 2% of the water held on these surfaces?

Saturated flow is one of three types of water movement in soils. Infiltration of water into an irrigated furrow is one example of this type of water flow. Name the other two types of water flow in soils and for each type, briefly describe three real-world examples.