Description
Return physicalVolume = opening+incoming-drawn-evaporation, usableVolume = max(0,physicalVolume-unusableReserve) and shortfall = max(0,unusableReserve-physicalVolume).
A volume estimate connects an area and depth, a flow and time, or a storage balance. Coherent units and explicit reserves distinguish physical volume from usable capacity; a valid quantity balance does not establish water quality or structural adequacy.
Return physicalVolume = opening+incoming-drawn-evaporation, usableVolume = max(0,physicalVolume-unusableReserve) and shortfall = max(0,unusableReserve-physicalVolume).
When to use this tool
Use Household Water Storage Residual Volume when checking a supplied volume conversion, reserve or storage balance.
How to use the tool and how it works
- Enter opening, incoming, drawn, evaporation, unusableReserve. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read physicalVolume, usableVolume, shortfall. Use the output convention below.
Require nonnegative opening, incoming, drawn, evaporation and unusableReserve, with drawn+evaporation <= opening+incoming. Return physicalVolume = opening+incoming-drawn-evaporation, usableVolume = max(0,physicalVolume-unusableReserve) and shortfall = max(0,unusableReserve-physicalVolume).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| opening | Opening | Required. Finite number; minimum 0. |
| incoming | Incoming | Required. Finite number; minimum 0. |
| drawn | Drawn | Required. Finite number; minimum 0. |
| evaporation | Evaporation | Required. Finite number; minimum 0. |
| unusableReserve | Unusable Reserve | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| physicalVolume | Physical Volume | Required. Finite number. |
| usableVolume | Usable Volume | Required. Finite number. |
| shortfall | Shortfall | Required. Finite number. |
{
"input": {
"opening": 100,
"incoming": 20,
"drawn": 60,
"evaporation": 5,
"unusableReserve": 10
},
"output": {
"physicalVolume": 55,
"usableVolume": 45,
"shortfall": 0
}
}Limitations and assumptions
- Use one volume unit. The reserve is a supplied usability assumption; quantity balance does not establish water potability, availability through plumbing or contamination control.
- 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
Use a hydraulic model, actual tank geometry and qualified design criteria when time-varying flow or practical capacity matters.
References
Similar or alternative tools
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