Description
Calculate one subarea's precipitation contribution to a supplied basin mean.
Weather accumulation records need explicit reset, carry, observation-time and area-weight conventions. Trace or missing precipitation differs from measured zero, and radar dBZ must be converted to a linear basis before a linear reflectivity mean. Supplied density, timing and weighting terms do not create a forecast or verify actual weather conditions.
Calculate one subarea's precipitation contribution to a supplied basin mean.
When to use this tool
Use Precipitation Basin Area Weight when you already have subarea, totalBasinArea, subareaDepth and need to calculate one subarea's precipitation contribution to a supplied basin mean.
How to use the tool and how it works
- Enter subarea, totalBasinArea, subareaDepth. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read areaWeight, basinDepthContribution. Use the output convention below.
Require basinArea>0, subarea in [0,basin] and depth>=0; weight=subarea/basin and contribution=weight*depth.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| subarea | Subarea | Required. Finite number; minimum 0. |
| totalBasinArea | Total Basin Area | Required. Finite number; strictly above 0. |
| subareaDepth | Subarea Depth | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| areaWeight | Area Weight | Required. Finite number. |
| basinDepthContribution | One area-weighted contribution, not the full basin mean until all disjoint areas are included. | Required. Finite number. |
{
"input": {
"subarea": 25,
"totalBasinArea": 100,
"subareaDepth": 20
},
"output": {
"areaWeight": 0.25,
"basinDepthContribution": 5
}
}Limitations and assumptions
- Areas need matching units and coverage; this is one contribution, not a full basin mean or spatial precipitation estimate.
- 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
Review the original gauge/radar series, clock and accumulation metadata, including resets and missing intervals. Use the complete spatial or process model for basin precipitation, snow or forecasting; local depth contributions and reference gaps do not infer unobserved weather.
References
Similar or alternative tools
- Precipitation Accumulator Reset Difference
Calculate a precipitation-accumulator increment with a known-zero-reset switch.
- Precipitation Phase Source Confidence Token
Preserve explicitly supplied precipitation phase and confidence-source metadata.