Description
Return physicalEmptyVolume = planArea*(totalHeight-waterHeight), usableEmptyVolume = max(0,planArea*(totalHeight-freeboardHeight-waterHeight)) and freeboardVolume = planArea*freeboardHeight.
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 physicalEmptyVolume = planArea*(totalHeight-waterHeight), usableEmptyVolume = max(0,planArea*(totalHeight-freeboardHeight-waterHeight)) and freeboardVolume = planArea*freeboardHeight.
When to use this tool
Use Rainwater Tank Freeboard Volume Term when checking a supplied volume conversion, reserve or storage balance.
How to use the tool and how it works
- Enter planArea, totalHeight, waterHeight, freeboardHeight. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read physicalEmptyVolume, usableEmptyVolume, freeboardVolume. Use the output convention below.
Require positive planArea, nonnegative totalHeight and waterHeight <= totalHeight, and freeboardHeight between zero and totalHeight. Return physicalEmptyVolume = planArea*(totalHeight-waterHeight), usableEmptyVolume = max(0,planArea*(totalHeight-freeboardHeight-waterHeight)) and freeboardVolume = planArea*freeboardHeight.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| planArea | Plan Area | Required. Finite number; strictly above 0. |
| totalHeight | Total Height | Required. Finite number; minimum 0. |
| waterHeight | Water Height | Required. Finite number; minimum 0. |
| freeboardHeight | Freeboard Height | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| physicalEmptyVolume | Physical Empty Volume | Required. Finite number. |
| usableEmptyVolume | Usable Empty Volume | Required. Finite number. |
| freeboardVolume | Freeboard Volume | Required. Finite number. |
{
"input": {
"planArea": 10,
"totalHeight": 3,
"waterHeight": 2,
"freeboardHeight": 0.2
},
"output": {
"physicalEmptyVolume": 10,
"usableEmptyVolume": 7.999999999999998,
"freeboardVolume": 2
}
}Limitations and assumptions
- Water height must also be nonnegative. A prismatic constant-area tank is assumed; freeboard is reserved rather than counted as usable storage. The outputs do not establish overflow routing, structural capacity or safe tank design.
- 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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