Examples
Examples
Try the starting example
- Event rainfall (mm)
- 80
- User-selected curve number CN
- 75
- Initial abstraction ratio lambda
- 0.2
- Potential retention S (mm)
- 84.666667
- Initial abstraction (mm)
- 16.933333
- Modeled direct runoff depth (mm)
- 26.922864
Try another scenario
- Event rainfall (mm)
- 81
- User-selected curve number CN
- 75
- Initial abstraction ratio lambda
- 0.2
- Potential retention S (mm)
- 84.666667
- Initial abstraction (mm)
- 16.933333
- Modeled direct runoff depth (mm)
- 27.596623
Calculation method
Calculation method
Potential retention S (mm)
Curve-number event model S=25400/CN−254 mm, Ia=λS, Q=(P−Ia)²/(P−Ia+S) above Ia.
Initial abstraction (mm)
Curve-number event model S=25400/CN−254 mm, Ia=λS, Q=(P−Ia)²/(P−Ia+S) above Ia.
Modeled direct runoff depth (mm)
Curve-number event model S=25400/CN−254 mm, Ia=λS, Q=(P−Ia)²/(P−Ia+S) above Ia.
Symbols and units
- a
- Event rainfall (mm)
- b
- User-selected curve number CN
- c
- Initial abstraction ratio lambda
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; Curve-number event model S=25400/CN−254 mm, Ia=λS, Q=(P−Ia)²/(P−Ia+S) above Ia. 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.