Description
Return activeArea = area*activeFraction and loading = flow/activeArea.
Nominal hydraulic ratios connect flow to area, length, volume or travel time. These local terms depend on active geometry and steady conditions; they do not describe a full distribution of velocities, residence times or treatment performance.
Return activeArea = area*activeFraction and loading = flow/activeArea.
When to use this tool
Use Wastewater Hydraulic Loading Area Term when checking one supplied hydraulic loading, clearance, volume or travel-time term.
How to use the tool and how it works
- Enter flow, area, activeFraction. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read activeArea, loading. Use the output convention below.
Require nonnegative flow, positive area and activeFraction in (0,1]. Return activeArea = area*activeFraction and loading = flow/activeArea. Use flow volume per time and area units that produce the desired hydraulic loading, such as m³/day divided by m² = m/day.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| flow | Volume per time, on the concentration and duration unit basis used in the formula. | Required. Finite number; minimum 0. |
| area | Area on the coherent length basis required by the volume or loading formula. | Required. Finite number; strictly above 0. |
| activeFraction | Active Fraction | Required. Finite number; maximum 1; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| activeArea | Active Area | Required. Finite number. |
| loading | Loading | Required. Finite number. |
{
"input": {
"flow": 1000,
"area": 200,
"activeFraction": 0.8
},
"output": {
"activeArea": 160,
"loading": 6.25
}
}Limitations and assumptions
- This is a nominal loading on the supplied active area, not an assessment of treatment capacity, short-circuiting, distribution or compliance with a design standard.
- 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 complete hydraulic and treatment model when changing flows, turbulence, media behavior or safety margins matter.
References
Similar or alternative tools
- Sedimentation Weirloading Overflowlength Term
Return activeWeirLength = weirCount*lengthPerWeir*activeFraction and loadingPerLength = flowPerDay/activeWeirLength.
- Activated Sludge Solids Inventory Term Tool
Calculate activated sludge solids inventory term from explicit caller-supplied inputs.