Question:
Saturated hydraulic conductivity in situ is measured by
Saturated hydraulic conductivity in situ is measured by
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Guelph permeameter is ideal for field-based saturated hydraulic conductivity measurement.
Updated On: Jul 2, 2026
- Guelph permeameter
- Neutron probe
- Infiltrometer
- Piezometer
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The Correct Option is A
Approach Solution - 1
Guelph permeameter is specifically designed to measure in situ saturated hydraulic conductivity in soils by establishing a constant-head condition in a borehole.
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Approach Solution -2
Elimination of instruments by function:
A neutron probe measures volumetric soil water content by counting slowed neutrons, not hydraulic conductivity. An infiltrometer measures the rate at which water enters the soil surface, an unsaturated, near-surface process rather than a true in-situ saturated conductivity value. A piezometer measures the hydraulic head or water table elevation, not flow rate through the soil matrix. Only the Guelph permeameter creates a constant head of water in an augered borehole below the water table and calculates saturated hydraulic conductivity in situ directly from Darcy's law applied to the steady-state outflow, making option 1 correct.
A neutron probe measures volumetric soil water content by counting slowed neutrons, not hydraulic conductivity. An infiltrometer measures the rate at which water enters the soil surface, an unsaturated, near-surface process rather than a true in-situ saturated conductivity value. A piezometer measures the hydraulic head or water table elevation, not flow rate through the soil matrix. Only the Guelph permeameter creates a constant head of water in an augered borehole below the water table and calculates saturated hydraulic conductivity in situ directly from Darcy's law applied to the steady-state outflow, making option 1 correct.
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