Examples
Examples
Try the starting example
- Standpipe cross-section (cm²)
- 1
- Sample cross-section (cm²)
- 50
- Sample length (cm)
- 10
- Initial head (cm)
- 100
- Final head (cm)
- 60
- Elapsed time (s)
- 300
- Hydraulic conductivity (cm/s)
- 0.000341
- Hydraulic conductivity (m/s)
- 0.000003
Try another scenario
- Standpipe cross-section (cm²)
- 2
- Sample cross-section (cm²)
- 50
- Sample length (cm)
- 10
- Initial head (cm)
- 100
- Final head (cm)
- 60
- Elapsed time (s)
- 300
- Hydraulic conductivity (cm/s)
- 0.000681
- Hydraulic conductivity (m/s)
- 0.000007
Calculation method
Calculation method
Hydraulic conductivity (cm/s)
Falling-head k=(standpipe area×sample length)/(sample area×time)×ln(initial head/final head).
Hydraulic conductivity (m/s)
Falling-head k=(standpipe area×sample length)/(sample area×time)×ln(initial head/final head).
Symbols and units
- a
- Standpipe cross-section (cm²)
- b
- Sample cross-section (cm²)
- c
- Sample length (cm)
- d
- Initial head (cm)
- e
- Final head (cm)
- f
- Elapsed time (s)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- User-supplied measurements and assumptions; Falling-head k=(standpipe area×sample length)/(sample area×time)×ln(initial head/final head). Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.