Description
Calculate gross and void volume of a supplied drainage layer.
Landscape geometry distinguishes plan area, depth, void fraction, grade, center spacing and nominal clearances. A horizontal-per-vertical slope is the inverse orientation of rise/run, and post counts differ from bay counts. Supplied geometric terms do not establish stability, drainage, accessibility or safe construction.
Calculate gross and void volume of a supplied drainage layer.
When to use this tool
Use Planter Free Drainage Layer Volume when you already have planArea, layerDepth, suppliedVoidFraction and need to calculate gross and void volume of a supplied drainage layer.
How to use the tool and how it works
- Enter planArea, layerDepth, suppliedVoidFraction. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read grossLayerVolume, voidVolume. Use the output convention below.
Require area/depth>=0 and void fraction in [0,1]; gross=area*depth, void=gross*fraction.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| planArea | Plan Area | Required. Finite number; minimum 0. |
| layerDepth | Layer Depth | Required. Finite number; minimum 0. |
| suppliedVoidFraction | Supplied Void Fraction | Required. Finite number; minimum 0; maximum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| grossLayerVolume | Gross Layer Volume | Required. Finite number. |
| voidVolume | planArea*layerDepth*suppliedVoidFraction; geometric void volume, not necessarily plant-available water. | Required. Finite number. |
{
"input": {
"planArea": 2,
"layerDepth": 0.2,
"suppliedVoidFraction": 0.5
},
"output": {
"grossLayerVolume": 0.4,
"voidVolume": 0.2
}
}Limitations and assumptions
- Use matching length/area units; nominal void volume is not available water storage, infiltration capacity or verified drainage performance.
- 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 verified site survey and complete dimensioned layout for a landscape design. Include material behavior, drainage, ground conditions and the applicable requirements when local volumes, grades or spacing calculations cannot answer the full question.
References
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