Question

The steady-state soil infiltration rate is

• A. Soil Surface controlled
• B. Soil profile controlled
• C. Water supply controlled
• D. Ground water controlled

Hint:

Initial infiltration is surface-driven; steady-state depends on the soil profile.

Answer 1

The Correct Option is B

The steady-state infiltration rate is determined by the soil's profile characteristics like texture, structure, and compaction, which affect the soil's permeability. The surface influences initial infiltration, but long-term (steady-state) is profile-dependent.

Answer 2

Looking at the infiltration curve over time: At the start of infiltration, the rate is high and is largely governed by the dryness and surface condition of the topsoil.
As water continues to enter, the surface and upper layers become saturated, and the rate declines until it levels off at a constant value.
This constant, steady-state rate is no longer limited by the surface; instead it is controlled by how fast water can move through the soil profile as a whole, governed by the saturated hydraulic conductivity of the least permeable layer, making the process soil profile controlled.