Description
Form opening+topup-drain-evaporated for expectedClosing and return measuredClosing minus that expectation, with all inputs nonnegative.
A water balance tracks additions, withdrawals, storage changes, and a residual over one declared interval. A remainder can reveal inconsistency without identifying whether it came from leakage, timing, or measurement error.
Form opening+topup-drain-evaporated for expectedClosing and return measuredClosing minus that expectation, with all inputs nonnegative.
When to use this tool
Use Hydroponic Daily Water Balance Residual when you need one transparent water-volume or storage-accounting component.
How to use the tool and how it works
- Enter opening, topup, drain, evaporated, measuredClosing. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read expectedClosing, residual. Use the output convention below.
Form opening+topup-drain-evaporated for expectedClosing and return measuredClosing minus that expectation, with all inputs nonnegative.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| opening | Opening | Required. Finite number; minimum 0. |
| topup | Topup | Required. Finite number; minimum 0. |
| drain | Drain | Required. Finite number; minimum 0. |
| evaporated | Evaporated | Required. Finite number; minimum 0. |
| measuredClosing | Measured Closing | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| expectedClosing | Expected Closing | Required. Finite number. |
| residual | Residual | Required. Finite number. |
{
"input": {
"opening": 100,
"topup": 20,
"drain": 10,
"evaporated": 5,
"measuredClosing": 103
},
"output": {
"expectedClosing": 105,
"residual": -2
}
}Limitations and assumptions
- Use one volume and observation interval; expectedClosing may be negative and residual does not identify the cause of imbalance or validate measurements.
- 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
Reconcile all flows and storage observations on a common interval and investigate residuals using independent measurements.
References
Similar or alternative tools
- Reservoir Topup Volume Delta
Return afterVolume-beforeVolume and add withdrawalsDuringTopup for inferredAddedVolume, requiring nonnegative volumes and a nonnegative inferred addition.
- Reservoir Topup Overflow Gap
Form initialVolume+addedVolume-removedVolume, report its excess above capacity as overflow, cap expectedFinal at capacity, and return measuredFinal minus expectedFinal.