Soil Permeability Calculator

Calculate hydraulic conductivity from falling-head permeameter: K = (aL/At)·ln(h₁/h₂). Constant-head test: K = QL/(Aht). Hazen approximation K = C·D₁₀² for clean sands. Units: cm/s or m/day.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)
σy — Normal Stress Y (MPa)
τxy — Shear Stress (MPa)
⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.
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How It Works

Calculate hydraulic conductivity from falling-head permeameter: K = (aL/At)·ln(h₁/h₂). Constant-head test: K = QL/(Aht). Hazen approximation K = C·D₁₀² for clean sands. Units: cm/s or m/day

Each component has a specific meaning:

  • Falling-head permeameter: K = ·ln — The falling-head permeameter: k = ·ln recorded for the patient or scenario being assessed.

Note: Interpret the soil permeability result against the clinical thresholds and context described above.

How to Use

Enter the falling-head permeameter: K = ·ln for the patient or scenario you are assessing. Calculate hydraulic conductivity from falling-head permeameter: K = (aL/At)·ln(h₁/h₂). Constant-head test: K = QL/(Aht). Hazen approximation K = C·D₁₀² for clean sands. Units: cm/s or m/day. Use the soil permeability result to inform your clinical assessment.

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Frequently Asked Questions