Reconcile one constant-head specimen calculation with a laboratory-reported saturated hydraulic conductivity while retaining method and specimen boundaries.
A quick decision brief for this specific tool
Collected flow volume, specimen length/area, defined hydraulic-head difference, elapsed interval and same-specimen laboratory conductivity
Calculated constant-head conductivity in cm/s and cm/day plus signed laboratory difference
Reconciles one documented saturated constant-head specimen/interval; it is not a universal field permeability or design value
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Reconcile one documented constant-head specimen calculation with a laboratory-reported saturated hydraulic conductivity.
Reproduce conductivity from the recorded volume, dimensions, head and elapsed time.
Enter the six matched specimen/test values and compare with the laboratory report.
Sees cm/s, cm/day and the signed report difference.
Keep saturation, specimen preparation, temperature and boundary conditions attached.
Review those records outside the calculator before accepting the arithmetic comparison.
Does not compare incompatible method or correction bases.
Avoid using one laboratory specimen as a universal site design parameter.
Use field investigation, stratification, cracks/macropores, replication and governing design procedures separately.
Does not authorize drainage or earthwork design from this result alone.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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Enter collected flow volume, specimen length and area, applied head difference and elapsed time from the same stabilized test interval. Every denominator must be positive.
The worksheet calculates K = QL divided by A times delta-h times t in cm/s, then reports the equivalent cm/day. It does not substitute a texture class or typical value.
The signed result compares calculated K with an entered laboratory K. Saturation, specimen preparation, temperature correction, flow direction and boundary conditions must match before interpreting a discrepancy.
Updated: August 2026
Reproduce a constant-head result from the original volume, time, head and specimen geometry records.
Compare the worksheet with a reported conductivity only after checking units, corrections, saturation and specimen condition.
Use the specimen record alongside replication, soil layers, cracks, macropores and field evidence; do not promote it to a universal site value.
Enter the hydraulic head difference across the specimen for the same collection interval and retain the apparatus datum and reading record.
Review sampling disturbance, saturation, anisotropy, stratification, cracks, boundaries, replication and the governing field/design procedure separately.
This tool checks constant-head arithmetic for one documented specimen and test interval. It does not assign a soil class, predict infiltration or provide a drainage, septic or earthwork design value.
