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French Drain Trench Volume Calculator — result sheet
Estimate trench volume, pipe length, and drainage-rock volume from rectangular trench dimensions and a rock-fill fraction.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Trench volume = length × width × depth; rock volume = trench volume × rock fraction; pipe length = trench length.
The estimate separates the excavated rectangular volume from the share assigned to drainage rock.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Trench length — length units; minimum 1.0E-6; maximum 1000000
- Trench width — length units; minimum 1.0E-6; maximum 1000000
- Trench depth — length units; minimum 1.0E-6; maximum 1000000
- Rock-fill fraction — %; minimum 0; maximum 100
Worked example
| Input | Value |
|---|---|
| Trench length | 12 |
| Trench width | 0.3 |
| Trench depth | 0.6 |
| Rock-fill fraction | 70 |
Trench volume = 2.16 cubic units; rock volume = 1.512 cubic units; pipe = 12 length units.
Assumptions and limits
- Dimensions share one unit system and rock fraction is from 0 to 100 percent.
- The trench is rectangular and the pipe follows its full length.
- Pipe diameter, fabric overlap, slope, cleanouts, soil disposal, compaction, and local drainage requirements are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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