Water Demand GPM Calculator
Actual independently qualified coincident fixture demand GPM sum, not Hunter fixture-unit curve or municipalL/person/day. Actual independently established design/material/calibration and matched units; not a safe work instruction, code compliance or engineering approval.
Description
Building water demand depends on which outlets operate together and the flow each outlet needs.
Building water demand depends on which outlets operate together and the flow each outlet needs.1
This tool adds independently established simultaneous demands in gallons per minute without selecting a fixture-diversity rule.
When to use Water Demand GPM Calculator
Use this tool to add independently established simultaneous demands in gallons per minute without selecting a fixture-diversity rule.
How to use Water Demand GPM Calculator and how it works
- Prepare callerIndependentlyQualifiedSimultaneousFixtureDemandGpm, with the units, conventions and assumptions below.
- Enter the required fields and run Water Demand GPM Calculator.
- Read result.value using the output definitions below.
- Correct any rejected inputs and rerun; interpret the result within the stated model and its assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerIndependentlyQualifiedSimultaneousFixtureDemandGpm | Caller Independently Qualified Simultaneous Fixture Demand Gpm. Use the units and matching context stated in the calculation below. | array of number | Required; other constraints below |
Supply a nonempty array of nonnegative independently established simultaneous outlet demands in gallons per minute. Sum the entries and return total gallons per minute. No fixture-unit conversion or simultaneity factor is selected, and duplicate demands are not detected.
totalGallonsPerMinute=sum(simultaneousDemandsGpm) Apply the input ordering, units and branch conditions stated above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the calculated or selected fields below. | object |
| result.value | Sum of independently qualified simultaneous demands in gallons per minute. | number |
{
"input": {
"callerIndependentlyQualifiedSimultaneousFixtureDemandGpm": [
2,
4
]
},
"output": {
"result": {
"value": 6
}
}
}Limitations and assumptions
The calculation uses the supplied observations and model inputs. It does not collect measurements, select a reference population or coefficient, or establish that the model applies to the actual case. The stated branch conditions and output units remain part of the result.
All fields require explicit values. Unexpected fields, wrong types, nonfinite numbers and sparse arrays are rejected. Alignment, bounds and supported-token rules are explained above; extremely large inputs or nonfinite results can also fail. Input errors differ from successful false comparisons, unavailable-domain flags and empty match lists.
Alternative or Complementary methods
Use Pressure Test Duration Calculator for a complementary operation: Plumbing pressure-test duration depends on the system, test method and applicable specification.
Use Pipe Hanger Spacing Calculator for a complementary operation: Pipe hanger spacing depends on pipe material, diameter, fluid, temperature and support conditions.
References
-
Water Demand GPM Calculator — tool.io
Similar or alternative tools
- Pressure Test Duration Calculator
Plumbing pressure-test duration depends on the system, test method and applicable specification.
- Pipe Hanger Spacing Calculator
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