Infiltration capacity is the maximum rate at which soil can absorb water. Actual infiltration occurs at this maximum "capacity rate" only when the rainfall supply rate exceeds what the soil can absorb — i.e., when rainfall intensity surpasses infiltration capacity, excess water becomes surface runoff/ponding while infiltration proceeds at its own maximum (capacity) rate.
When rainfall intensity is lower than the soil's infiltration capacity, all rainfall infiltrates and the actual infiltration rate equals the rainfall rate (supply-limited), not the...
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