Culvert Headwater Depth Calculator

Calculate headwater depth HW for inlet and outlet control conditions. FHWA nomograph method and equations. HW/D ratio check. Allowable headwater based on fill height and adjacent structure elevations. Road overtopping analysis.

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 headwater depth HW for inlet and outlet control conditions. FHWA nomograph method and equations. HW/D ratio check. Allowable headwater based on fill height and adjacent structure elevations. Road overtopping analysis

Each component has a specific meaning:

  • Fill height — The fill height recorded for the patient or scenario being assessed.
  • Adjacent structure elevations — The adjacent structure elevations recorded for the patient or scenario being assessed.

Note: Interpret the culvert headwater result against the clinical thresholds and context described above.

How to Use

Enter the fill height, adjacent structure elevations for the patient or scenario you are assessing. Calculate headwater depth HW for inlet and outlet control conditions. FHWA nomograph method and equations. HW/D ratio check. Allowable headwater based on fill height and adjacent structure elevations. Road overtopping analysis. Use the culvert headwater result to inform your clinical assessment.

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Frequently Asked Questions