Description
Return diversionVolume = catchmentArea*flushDepth*runoffFraction.
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 diversionVolume = catchmentArea*flushDepth*runoffFraction.
When to use this tool
Use Rainwater First Flush Diversion Volume when checking a supplied volume conversion, reserve or storage balance.
How to use the tool and how it works
- Enter catchmentArea, flushDepth, runoffFraction. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read diversionVolume. Use the output convention below.
Require nonnegative catchmentArea and flushDepth and runoffFraction in [0,1]. Return diversionVolume = catchmentArea*flushDepth*runoffFraction. Use coherent area and depth units: m² times m gives m³; convert a depth entered in millimeters before using that combination.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| catchmentArea | Catchment Area | Required. Finite number; minimum 0. |
| flushDepth | Flush Depth | Required. Finite number; minimum 0. |
| runoffFraction | Runoff Fraction | Required. Finite number; minimum 0; maximum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| diversionVolume | Diversion Volume | Required. Finite number. |
{
"input": {
"catchmentArea": 100,
"flushDepth": 0.001,
"runoffFraction": 0.8
},
"output": {
"diversionVolume": 0.08000000000000002
}
}Limitations and assumptions
- This is a supplied first-flush volume term, not tank sizing, treatment design or a recommendation of a suitable first-flush depth. No contaminant removal or water potability is established.
- 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
- Groundwater Recharge Area Depth Volume
Return rechargeVolume = area*rechargeDepth*fractionReachingAquifer.
- Landfill Cover Soil Volume Term Tool
Calculate landfill cover soil volume term from explicit caller-supplied inputs.