Plumbing French Drain Flow Calculator
DarcyFrenchdrain actual porous flow KA iunderindependently matched saturated laminar branch, no slot pipe conveyance or guaranteeunsaturateddrainage. Actual independently matched units, regime, material/equipment and governing references; not a hydraulic code, safe pressure, water pot ability or operational approval.
Description
Darcy porous-medium flow relates conductivity, area and hydraulic gradient.
Darcy porous-medium flow relates conductivity, area and hydraulic gradient.1
This branch describes the surrounding medium rather than conveyance inside a drain pipe. The calculation and input requirements are explained below.
When to use Plumbing French Drain Flow Calculator
Enter positive measured porous conductivity m/s, nonnegative effective area m² and finite signed hydraulic gradient.
How to use Plumbing French Drain Flow Calculator and how it works
- Prepare the measurements or independently established model inputs described below, with matching units and observation scope.
- Enter the required fields and run Plumbing French Drain Flow Calculator.
- Read the result fields using the formula, output units, signs and ordering explained below.
- Correct any rejected inputs and rerun; interpret the result within the stated model and its assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerMeasuredPorousMediumConductivityMetersPerSecond | Caller Measured Porous Medium Conductivity Meters Per Second. Use the units and matching context stated in the calculation below. | number | Required; strictly positive; finite; other constraints below |
| actualEffectiveFlowAreaSquareMeters | Actual Effective Flow Area Square Meters. Use the units and matching context stated in the calculation below. | number | Required; nonnegative; finite; other constraints below |
| actualHydraulicGradient | Actual Hydraulic Gradient. Use the units and matching context stated in the calculation below. | number | Required; finite; other constraints below |
Enter positive measured porous conductivity m/s, nonnegative effective area m² and finite signed hydraulic gradient. Multiply to return signed m³/s under the saturated laminar Darcy branch. No pipe conveyance or unsaturated model is calculated.
porousFlowM3ps=conductivityMps*areaM2*gradient 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 | Numeric result under the formula and output units explained above. | number |
{
"input": {
"callerMeasuredPorousMediumConductivityMetersPerSecond": 2,
"actualEffectiveFlowAreaSquareMeters": 5,
"actualHydraulicGradient": 1
},
"output": {
"result": {
"value": 10
}
}
}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 Plumbing Bioswale Flow Capacity Calculator for a complementary operation: A Manning flow estimate uses wetted area, hydraulic radius, energy slope and roughness.
Use Plumbing Roof Drain Flow Rate Calculator for a complementary operation: Roof runoff relates rain intensity, contributing area and a runoff fraction.
References
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Plumbing French Drain Flow Calculator — tool.io
Similar or alternative tools
- Plumbing Bioswale Flow Capacity Calculator
A Manning flow estimate uses wetted area, hydraulic radius, energy slope and roughness.
- Plumbing Roof Drain Flow Rate Calculator
Roof runoff relates rain intensity, contributing area and a runoff fraction.