Description
Sum nonnegative openings, subtract supplied overlappingArea, and subtract the resulting fraction of positive totalArea from one for coveredFraction.
Ideal water-storage and channel geometry uses dimensions, areas, and displacement fractions. Coherent length units determine areas and volumes; actual irregular geometry and hydraulic behavior require additional information.
Sum nonnegative openings, subtract supplied overlappingArea, and subtract the resulting fraction of positive totalArea from one for coveredFraction.
When to use this tool
Use Reservoir Cover Open Area Share when you need one explicit geometric component of a tank, bed, conduit, or channel.
How to use the tool and how it works
- Enter totalArea, openings, overlappingArea. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read openArea, coveredFraction. Use the output convention below.
Sum nonnegative openings, subtract supplied overlappingArea, and subtract the resulting fraction of positive totalArea from one for coveredFraction.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| totalArea | Total Area | Required. Finite number; strictly above 0. |
| openings | Openings | Required. Array of finite number; maximum items 256. |
| overlappingArea | Overlapping Area | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| openArea | Open Area | Required. Finite number. |
| coveredFraction | Covered Fraction | Required. Finite number. |
{
"input": {
"totalArea": 100,
"openings": [
10,
20
],
"overlappingArea": 5
},
"output": {
"openArea": 25,
"coveredFraction": 0.75
}
}Limitations and assumptions
- Overlap cannot exceed summed openings and net openings cannot exceed totalArea; geometry and multiple-overlap bookkeeping must already be resolved externally.
- 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
Check the full surveyed geometry and the physical model before interpreting storage, capacity, or safe operation.
References
Similar or alternative tools
- Channel Flow Section Share
Return their ratio.
- Growbed Flood Drain Volume Share
Multiply nonnegative grossBedVolume by one minus solidFraction for poreVolume, then by drainedFraction for drainableVolume, with both fractions in [0, 1].