Description
Multiply nonnegative intensityMmPerHour by durationMinutes/60 for depthMm and by runoffFraction in [0, 1] for effectiveDepthMm.
Precipitation and evaporation records distinguish water depth, catchment area, volume, and observation duration. Converting among them requires coherent units and a clear measured or modeled basis.
Multiply nonnegative intensityMmPerHour by durationMinutes/60 for depthMm and by runoffFraction in [0, 1] for effectiveDepthMm.
When to use this tool
Use Rainfall Intensity Duration Depth Factor when you need one explicit water-depth, volume, or accumulation component.
How to use the tool and how it works
- Enter intensityMmPerHour, durationMinutes, runoffFraction. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read depthMm, effectiveDepthMm. Use the output convention below.
Multiply nonnegative intensityMmPerHour by durationMinutes/60 for depthMm and by runoffFraction in [0, 1] for effectiveDepthMm.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| intensityMmPerHour | Intensity Mm Per Hour | Required. Finite number; minimum 0. |
| durationMinutes | Duration Minutes | Required. Finite number; minimum 0. |
| runoffFraction | Runoff Fraction | Required. Finite number; minimum 0; maximum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| depthMm | Depth Mm | Required. Finite number. |
| effectiveDepthMm | Effective Depth Mm | Required. Finite number. |
{
"input": {
"intensityMmPerHour": 12,
"durationMinutes": 30,
"runoffFraction": 0.6
},
"output": {
"depthMm": 6,
"effectiveDepthMm": 3.6
}
}Limitations and assumptions
- Intensity is constant over the supplied duration; the runoff fraction is supplied, without infiltration, routing, or event-loss estimation.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Check instrument records, unit conversions, temporal coverage, and a complete hydrologic model before interpreting runoff or water availability.
References
Similar or alternative tools
- Storm Hyetograph One Bin Volume Term
Multiply depthMm by areaKm2, coveredFraction in [0, 1], and 1000 for volumeM3.
- Catchment Precipitation Area Term
Multiply nonnegative depth by nonnegative area for volume.