Water Balance Precipitation Evaporation Calculator
ActualdirectlakeP−Ewatervolumecontributiononly,not allcatchmentinflows/seepageor complete balance. Actual independent model/unit/frame/epoch/calibration and applicable measurement established;not precise ephemeris,forecast,geodesy operation,identity or safety approval.
Description
Direct precipitation and evaporation contribute signed water-volume change across a lake surface.
Direct precipitation and evaporation contribute signed water-volume change across a lake surface.1
This term covers the surface exchange for a matched period, while catchment inflow and seepage need separate terms.
When to use Water Balance Precipitation Evaporation Calculator
Use this tool to apply the stated water balance precipitation evaporation calculator operation with an explicit input and unit basis.
How to use Water Balance Precipitation Evaporation Calculator and how it works
- Establish the measurement basis and units described above.
- Enter actualPeriodPrecipitationDepthMeters, actualPeriodEvaporationDepthMeters, actualMatchedLakeSurfaceAreaM2 and run the tool.
- Read result.value using the output meanings below.
- If input is rejected, correct the stated type, range, ordering or alignment issue and rerun; review successful results under the declared convention.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualPeriodPrecipitationDepthMeters | Period precipitation depth meters, on the basis specified in the algorithm. | number | required; finite; nonnegative; further conditions in the algorithm |
| actualPeriodEvaporationDepthMeters | Period evaporation depth meters, on the basis specified in the algorithm. | number | required; finite; nonnegative; further conditions in the algorithm |
| actualMatchedLakeSurfaceAreaM2 | Matched lake surface area m2, on the basis specified in the algorithm. | number | required; finite; strictly positive; further conditions in the algorithm |
Require nonnegative precipitation and evaporation depths in meters and positive surface area in square meters. Multiply their signed depth difference by area.
volume m³ = (precipitation m − evaporation m) × surface m² Apply the declared units, ordering and branch conditions.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the declared output fields. | object |
| result.value | Signed direct surface-exchange volume in cubic meters. | number |
{
"input": {
"actualPeriodPrecipitationDepthMeters": 1,
"actualPeriodEvaporationDepthMeters": 2,
"actualMatchedLakeSurfaceAreaM2": 10
},
"output": {
"result": {
"value": -10
}
}
}Limitations and assumptions
The output applies the declared operation to the values you supply. Establish the measurement basis, units, coefficients and any caller-selected rules before interpreting it. The tool does not independently collect or verify observations or decide whether a model or reference applies.
Supply explicit required fields with the documented types and dense aligned arrays. Unknown fields, wrong types and nonfinite numbers are rejected. Branch-specific constraints are explained above. A successful false boolean, negative signed difference, empty slice or unresolved tie is distinct from an input error. Very large inputs or outputs may be rejected by shared resource limits.
Alternative or Complementary methods
For a related operation, use Watershed Lake Area Drainage Ratio Calculator. Drainage ratio compares an independently delineated tributary watershed with the lake's measured area.
For a related operation, use Inflow Outflow Storage Residual Checker. A storage ledger residual compares observed lake storage change with recorded inflow minus outflow.
References
Similar or alternative tools
- Watershed Lake Area Drainage Ratio Calculator
Drainage ratio compares an independently delineated tributary watershed with the lake's measured area.
- Inflow Outflow Storage Residual Checker
A storage ledger residual compares observed lake storage change with recorded inflow minus outflow.